Answers
Answer: Most synthesis reactions are exothermic because the energy needed to break the reactant bonds is typically less than the energy released when the product bonds form. In other words, the reactant bonds have a lower energy level than the product bonds, so when the reactant bonds are broken and the product bonds are formed, energy is released in the form of heat.
This can be represented by an energy level diagram, in which the reactant bonds are shown at a lower energy level than the product bonds. When the reactant bonds are broken and the product bonds are formed, the energy level of the reaction decreases, indicating that energy is released.
Overall, the fact that most synthesis reactions are exothermic implies that the energy needed to break the reactant bonds is typically less than the energy released when the product bonds form. This is reflected in the energy level diagram, where the reactant bonds are shown at a lower energy level than the product bonds.
Explanation:
Answer:
Synthesis reactions are typically exothermic because the products of the reaction have lower energy than the reactants. This means that the energy needed to break the bonds in the reactants is less than the energy released when the product bonds form.
An energy level diagram can help illustrate this concept. In a synthesis reaction, the reactants are represented by two energy levels on the left side of the diagram, and the products are represented by a lower energy level on the right side. The energy difference between the reactants and the products is represented by the vertical distance between the two sets of energy levels. Since the product energy level is lower than the reactant energy levels, the reaction releases energy and is exothermic.
Here is an example of an energy level diagram for a synthesis reaction:
In this diagram, the vertical distance between the reactant and product energy levels represents the energy released by the reaction. This energy is typically in the form of heat, which is why most synthesis reactions are exothermic.
Related Questions
100.0 mL of a 0.630 M solution of KBr is diluted to 500.0 mL. What is
the new concentration of the solution?
Answers
Answer:
C2= 0.126M
Explanation:
C1*V1=C2*V2
C1= 0.630M
C2=?
V1= 100.0ML
V2= 500.0ML
0.630*100 = C2*500
C2= 0.630*100÷500
C2= 63÷500
C2= 0.126M
based on what you learned about nuclear fusion in the sun, select all of the correct statements from the following list.
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The correct statement in regards to nuclear fusion are 1) Only in the sun's core does fusion take place because of the necessary temperatures.
2) The three types of neutrinos oscillate one after the other.
3) It takes very high temperatures for nuclei to merge.
The Sun and other stars are powered by nuclear fusion reactions. A heavier nucleus is created when two light nuclei fuse together in a fusion reaction. Because the mass of the resulting single nucleus is smaller than the combined mass of the two initial nuclei, the process produces energy. Remaining mass is converted to energy.
Controlled nuclear fission reactions and chemical reactions like burning coal, oil, or gas each produce roughly four million times as much energy as controlled atom fusion (at equal mass).
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a mixture of two gases will diffuse through a filter at rates proportional to their rms speeds. if the molecules of the two gases have masses m1 and m2, determine that the ratio of their rms speeds (or the ratio of their diffusion rates).
Answers
The statement states that their rms speed ratio would be (v1)rms (v2)rms Equal sqrt m2m1.
What is known as gas?In spite of gravity and despite the amount of stuff present, a vapor is a sample of material that adopts the shape of the box in which it is housed and develops an uniform distribution inside the container.
Exactly what is natural gas?Natural gas is an ancient fuel that formed deep inside the earth's crust. Natural gas contains a wide range of unique compounds... Methane, which is a molecule with one atom of carbon and four atoms, makes up the majority of natural gas (CH4)
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g suppose 6 m hcl is substituted for the 3 m hcl in the procedure. what would be the consequence of this substitution? explain. (page 188).
Answers
Because the acid is much more concentrated and the reaction will proceed more quickly, the mole ratios will be larger.
How is HCl made into a 6M solution?For instance, use 250 MG of concentrated acid to create 500 mL of 6M HCl, which you then gradually diluted with water.
How do you make 6M HCl from 12M HCl?6M HCl has half the concentration of 12M HCl, therefore a solution that is 50% 12M HCl, is a 6M solution. To make 0.5L of 6M HCl, you would need 0.25 (half of 0.5) litres of 12M HCl
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2. show how to make the molecule below from the indicated starting material. include the reagents necessary and any synthetic intermediates. (2 pts) 3. explain the regioselectivity of the nucleophilic attack of the chloronium ion below. compare it to nucleophilic attack of an epoxide. (2 pt)
Answers
Our activation strain analysis revealed the physical mechanisms underlying the regioselectivity of the ring-opening studied here. steric interactions are indeed responsible for regioselectivity under basic conditions.
When the nucleophile attacks at the more sterically hindered -position, it experiences significant steric (Pauli) repulsion from the epoxide's methyl substituents. This lowers the stabilising interaction energy and, as a result, raises the activation barrier compared to the -attack. Thus, in this interaction-controlled basic regime, -attack is dominant.
The carbons in an epoxide group are extremely reactive electrophiles, owing to the fact that significant ring strain is relieved when the ring opens in response to nucleophilic attack. Epoxides are typically formed in the laboratory and in the cell by the oxidation of an alkene.
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An atom of the element of atomic number 84 and mass number 199 emits an alpha particle. The residual atom after this change has an atomic number of ? and a mass number of?
82,195
Answers
The residual atom after an alpha particle emission by an atom of an element of atomic number 84 and mass number 199 has an atomic number of 82 and a mass number of 195.
What is an alpha particle emission?An alpha particle emission by a radioactive substance when it undergoes decay involves the emission of a helium nucleus from the nucleus of an atom resulting in the formation of an atom of an element whose atomic number is 2 less than the parent atom and whose atomic mass is 4 less than the parent atom.
The alpha particle emission by an atom of an element of atomic number 84 and mass number 199 is shown below:
¹⁹⁹₈₄X ---> ¹⁹⁵₈₂Y + ⁴₂He
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prodrugs are an area of medicinal chemistry that has been extensively researched over the last several years. prodrugs are designed to be initially inactive until further activated into the active form of the drug (which could include also esterification or trans-esterification event). for example: aspirin is a prodrug that gets converted to salicylic acid. (a) draw a complete arrow-pushing mechanism showing how aspirin is converted into salicylic acid (say by the stomach acylating enzyme at low ph). a scheme of the overall transformati
Answers
Prodrugs are designed to be initially inactive until further activated into the active form of the drug.
A prodrug is a chemical that is transformed before it has pharmacological effects. Or in other words, after you take a prodrug, it basically changes in your body before it starts working.
There are two major types of prodrugs. These categories are based on how prodrugs are generally converted in the body:
1) Type I prodrugs turn into their active forms inside of cells.
2) Type II prodrugs turn into their active forms outside of cells, such as in blood or other fluids.
Before a prodrug can provide its intended effects in your body, it firsts needs to be broken down. A prodrug’s type affects how the medication is transformed or activated that is whether it occurs inside or outside your cells.
Different types of prodrugs can also impact the drug interactions. Certain interactions may prevent a prodrug from becoming active.
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reduction of fluid losses at the kidneys due to the retention of na is the action of reduction of fluid losses at the kidneys due to the retention of na is the action of antidiuretic hormone. calcitonin. aldosterone. oxytocin. cortisone.
Answers
Reduction of fluid losses at the kidneys due to the retention of sodium is the action of reduction of fluid losses at the kidneys due to the retention of sodium is the action of aldosterone (option c).
What is the aldosterone chemical messenger?The aldosterone chemical messenger is a hormone whose main function is to reduce the loss of fluid that may lead to dehydration which may be associated with unbalanced levels of sodium that is able to produce liquid retention in the urinary system.
This hormone aldosterone is well known to maintain suitable volumes of liquids, electrolytic homeostatic balance, as well as normal blood pressure conditions.
Therefore, with this data, we can see that the aldosterone chemical messenger is fundamental to controlling the levels of fluids by the urinary system as well as to maintaining suitable blood pressure levels.
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Aqueous solutions of the following reactants are mixed. Calculate the concentration in mol/L) of calcium ions in solution after the reaction has gone to completion. 75.0 mL of 1.50 M AgNO, are mixed with 75.0 mL of 2.1 M Cacly DO NOT include units in your answer. If you round during your calculation, be sure to keep at least four (4) decimal places. Report your answer to two (2) decimal places. Answer: Calculate the mass of precipitate formed (in grams) when aqueous solutions of the following reactants are mixed. Assume that the reaction goes to completion. 79 mL of 1.50 M AgNO3 are mixed with 75.0 mL of 1.00 M CaCl, Do NOT include units in your answer. If you round during your calculation, be sure to keep at least four (4) decimal places. Report your answer to two (2) decimal places. Answer:
Answers
Concentration of calcium = 0.075 moles.
Mass of precipitate = 16.98g.
The molarity of a solution is the number of moles of solute in a volume of 1000 mL.
A substance's molar mass is equal to 1 mole of any substance.
A sample's mass is determined by multiplying its molar mass by the number of its moles.
MAgCl = 143.32 g/mol
Balanced chemical equation:
2 AgNO3 (aq) + CaCl2 (aq) → Ca(NO3)2 (aq) + 2 AgCl (s)
Molar ratio of AgNO3, CaCl2, Ca(NO3)2, AgCl are 2 : 1 : 1 : 2 respectively.
Net ionic equation:
2 Ag+ (aq) + 2 Cl- (aq) → 2 AgCl (s)
or, Ag+ (aq) + Cl- (aq) → AgCl (s)
So, the number of moles of moles of Ca+2 will not change after the completion of reacton,
as it acts as a spectetor ion, i.e. do not take part in effective reaction.
only the volume increases.
Hence, total volume of the solution has become = 75 + 75 = 150 mL
Now, 2.1 M CaCl2
= There are 2.1 moles of CaCl2 in 1000 mL of the solution.
So, in 75 mL of the solution, there are [ (2.1/1000) x 75 ]
= 0.1575 mole of CaCl2
= 0.1575 mole of Ca+2 (aq)
After completion of the reaction, there are 0.1575 mole of Ca+2 (aq) ion in the 150 mL of solution.
In 1000 mL of solution there will be [(0.1575/150) x 1000] = 1.05 mol/L
New molarity of Ca+2 (aq) ion = 1.05 M
Again,
1.5 M AgNO3
= There are 1.5 moles of AgNO3 in 1000 mL of the sample.
So, in 79 mL of the solution, there are [ (1.5/1000) x 79 ] = 0.1185 mole of AgNO3
1.0 M CaCl2
= There are 1.0 moles of CaCl2 in 1000 mL of the sample.
So, in 75 mL of the solution, there are [ (1.0/1000) x 75 ] = 0.075 mole of CaCl2
Balanced chemical equation:
2 AgNO3 (aq) + CaCl2 (aq) → Ca(NO3)2 (aq) + 2 AgCl (s)
Molar ratio of AgNO3, CaCl2, Ca(NO3)2, AgCl are 2 : 1 : 1 : 2 respectively.
According to the molar ratio, 2 moles of AgNO3 consumes 1 mole of CaCl2
and produce 1 mole of Ca(NO3)2 and 2 moles of AgCl (s).
In this case, the limiting reagent is AgNO3
Hence, 0.1185 moles of CaCl2 will be consumed by (0.1185/2) = 0.05925 mole of AgNO3
Which will produce 0.1185 moles of AgCl (s).
We know, 1 mole of AgCl = 143.32 g of AgCl ( as MAgCl = 143.32 g/mol.)
So, 0.1185 mole of AgCl = 143.32 x 0.1185
= 16.9834 g of AgCl.
~16.98 gm of AgCl.
Therefore
Concentration calcium = 0.075 moles
Mass of precipitate = 16.98g
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assuming a dead space volume of 150 ml, which of the following would yield the lowest minute alveolar ventilation?
Answers
B) Respiratory rate, 16 breaths/min; tidal volume, 300 mL. Minute ventilation = tidal volume x respiratory rate (normal is 4-6 L/min).
What is the average volume of air that enters the alveoli?According to Boyle's law, pressure falls as lung volume increases. Based on the pressure differential, the resulting sub-atmospheric intra-alveolar pressure then forces air into the alveoli. A tidal volume of roughly 500 mL is administered when the pressure has equalized.
How is alveolar dead space determined?The concept of dead space will be substantially simplified once the equation is understood. According to the formula, VD is equal to VT times the difference between arterial carbon dioxide partial pressure (PaCO2) and expired carbon dioxide partial pressure (PeCO2) divided by PaCO2.
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A scientist measures the standard enthalpy change for the following reaction to be -67.6 kJ :
S(s,rhombic) + 2 CO(g)SO2(g) + 2 C(s,graphite)
Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of CO(g) is kJ/mol.
Answers
The standard enthalpy of formation of CO (g) is -114.15 kJ/mol (approx)
In thermodynamics, the standard enthalpy of formation or standard heat of formation of a compound is the change of enthalpy during the formation of 1 mole of the substance from its constituent elements in their reference state, with all substances in their standard states.
S(s,rhombic) + 2CO (g) ===>>SO2(g) + 2 C (s,graphite)
The standard enthalpy change of the Reaction is given by:
ΔH°rxn = nΣ ΔHf°(products) - nΣ ΔHf° (reactants)
=> ΔHf°rxn = [1mole* ΔHf°SO2(g) + 2mole* ΔHf°C(s,graphite)] - [1mole * ΔHf°S(s, rhombic) + 2mole * ΔHf°CO(g) ]
=> -67.8 kJ = [1mole * (-296.1kJ/mol) + 2mole *( 0kJ/mol)] - [1mole* (0 kJ/mol) + 2mole * ΔHf°CO(g) ]
=> -67.8 kJ = -296.1 kJ - [ 2 mole * ΔHf° CO(g) ]
=> -67.8 kJ + 296.1 kJ = - 2 mole * ΔHf°CO(g)
=> 228.3 kJ = -2 mole * ΔHf°CO(g)
=>ΔHf° CO(g) = -114.15 kJ/mol
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MEASUREMENT Naming components of the scientific method In the table below you will find three descriptions of scientists engaging in activities that are part of the scientific method What are the missing words? description missing word? Dmitri discovers that the known chemica elements can be arranged in pattern of columns and rows_ with elements in the same column behaving similarly. But there is no element at certain place in the pattern and Dmitri proposes the that an unknown ement fits into that spot _ and that it will have properties similar to the elements above and below it in the pattern John sets up an in which he reacts measured amount of carbon with various measured amounts of oxygen_ and takes note of whether compound forms and weighs how much of each lement is consumed forming it Wolfgang develops about the arrangement of elements in the Periodic Table_ based on some ideas about how ectrons are arranged in the different atoms of different elements_ Using equations he develops, he is able to predict the exact arrangement of electrons in many atoms and from there predict why they are where they are in the Periodic Table.
Answers
The three missing words are experiment, theory and
law.
What is elements ?
A pure substance known as an element is one that cannot be transformed into a less complex substance through any physical or chemical process. The same type of atoms make up each element. Metals, nonmetals, and metalloids are the different categories of elements. By their symbols, elements are represented.
What is Periodic Table ?
All chemical elements that have been found are arranged in rows (called periods) and columns (called groups) in the periodic table of chemical elements, often known as the periodic table, in increasing order of atomic number.
The missing words are:
experiment
theory and
law
A theory is a system of ideas intended to the explain something, especially one based on general principles independent of the thing to be explained Dmitris case this is true.
An experiment is a scientific procedure undertaken to make a discovers, test a hypothesis, or demonstrates a known fact like in case of john.
A law is the system of rules which a particular chemical species should obey like in the case of wolf garg.
Therefore, the three missing words are experiment, theory and
law.
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Complete the overall reaction catalyzed by the pyruvate dehydrogenase complex. Move the compounds and cofactors to the correct answer blanks. Two terms will not be used. CoA acetylCoA NADH NAD^+ ADP ATP pyruvate
Answers
The pyruvate dehydrogenase complex catalyzes the overall process of pyruvate + CoA + NAD+ ---> acetyl CoA + NADH.
Dehydrogenase is utilized where?
Introduction. Dehydrogenases are a class of enzymes that operate as biological catalysts in oxido-reduction reactions by eliminating hydrogen atoms (H) rather than oxygen (O). It is a flexible enzyme in the electron transfer chain or the respiratory chain route.
The function of glucose dehydrogenase:
In the presence of cofactors such nicotinamide adenine dinucleotide (NAD), FAD, or pyrroloquinoline quinone, GDH catalyzes the oxidation of glucose (PQQ). NADH is a product of GDH that can be detected by chromogenic, coulometric, or amperometric techniques.
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this is the pyranose structure of alpha-d-allose, four substituent groups are indicated. for each of these groups, indicate whether the group is in the axial or the equatorial orientation.
Answers
Axial groups are displayed "vertically" and alternate between up and down. The angle from the axial group is slightly larger than a straight angle, reflecting the typical 109 degree bond angle, even though equatorial groups are roughly horizontal.
What do axial and equatorial position mean?
Equatorial positions are located around the ring's plane, while axial positions are parallel to it. In this shape, the bond angles are 110.9°.
Equatorial orientation is defined?
The term "equatorial" describes how groups on cyclohexane rings are oriented when they are roughly in the plane of the ring. When large groups, such as t-butyl, occupy the equatorial position, torsional strain is reduced.
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Draw the mechanism for the aldol addition product and the aldol condensation product for the aldol reaction between4-nitrobenzaldehyde and a 2-acetylpyridine.
Answers
The mechanism for the aldol addition product and the aldol condensation product for the aldol reaction between4-nitrobenzaldehyde and a 2-acetylpyridine is given as,
What is aldol condensation with example?
Aldol condensations are significant in the synthesis of organic compounds because they offer a reliable method for forming carbon-carbon bonds. Aldol condensation, for instance, occurs during the Robinson annulation reaction sequence, and the Wieland-Miescher ketone product is a crucial building block in numerous chemical syntheses.
The mechanism for the aldol addition product and the aldol condensation product for the aldol reaction between4-nitrobenzaldehyde and a 2-acetylpyridine is given as,
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Draw structural formulas for the diene and dienophile that combine in a Diels-Alder reaction to form the product shown. Diene Dienophile CH3 + CH3 • Consider EIZ stereochemistry of alkenes. Draw one structure per sketcher. Add additional sketchers using the drop-down menu in the bottom right corner. Separate multiple products using the + sign from the drop-down menu. . Draw structural formulas for the diene and dienophile that combine in a Diels-Alder reaction to form the product shown. H3C CCH3 Diene Dienophile + H3C "CN Draw a structural formula for the product of the reaction shown. CH3 NC CO2CH3 옷 H H CH3
Answers
Firstly, to paraphrase Bonds 2: Diene has a double bond ; in product, it will change to a single bond. Dinophile's single bond will be our deciding factor; this is of 5 and reaction between these 2 is. In product form.
What is the CoCh3 functional group?Acetyl is a functional group in organic chemistry with the chemical formula COCH 3 and the structural formula C(=O)CH 3. Sometimes, the letter A is used to denote it (not to be confused with the element actinium). Although this name is rarely used, acetyl is referred to as ethanoyl in IUPAC nomenclature.
What does the functional group's name mean?Common functional groups include carbonyl, which is found in carboxylic acids, hydroxyl, which is found in alcohols and phenols, and carboxyl.
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The letter designations for the first four sublevels with the maximum number of electrons that can be accommodated in each sublevel are Select one: a. s:2, p:4, d:6, and f:8. b. s:1, p:2, d:3, and f:4. c. s:1, p:3, d:5, and f:7. d. s:2, p:6, d:10, and f:14.
Answers
The correct answer is a. The letter designations for the first four sublevels with the maximum number of electrons that can be accommodated in each sublevel are s:2, p:4, d:6, and f:8.
The sublevels of an atom are designated by the letters s, p, d, and f, and each sublevel can accommodate a maximum number of electrons. The s sublevel can accommodate up to 2 electrons, the p sublevel can accommodate up to 4 electrons, the d sublevel can accommodate up to 6 electrons, and the f sublevel can accommodate up to 8 electrons.
b. s:1, p:2, d:3, and f:4 is incorrect because these values are too low.
c. s:1, p:3, d:5, and f:7 is incorrect because these values are too low.
d. s:2, p:6, d:10, and f:14 is incorrect because these values are too high.
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next is the retrosynthesis of the acyl chloride from tert-butyl bromide. choose the best option for the precursor needed to make the acid chloride. 1949p4 1949p4c 1949p4b 1949p4a 1949p4e 1949p4d
Answers
Option A.The reaction of a carboxylic acid with SOCl2 produces acid chloride as a product.
Acid chlorides have the molecular formula RCOCl, where R is the side chain. They are carboxylic acid reactive derivatives. Acyl chloride is an organic compound consisting of a chlorine atom attached to an acyl group in organic chemistry.
Acyl chlorides are used to make anhydride amides and esters by reacting acid chlorides with salts of carboxylic acids, amines, or alcohols. There are some related compounds in which the -OH group of the acid is replaced by another. Such compounds are called acid derivatives.
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Complete the reaction, which is part of the electron transport chain. The abbreviation Q represents coenzyme Q. Use the appropriate abbreviation for the product. FADH 2 + Q ⟶ The reactant that is reduced is _____. In complex III, electrons are transferred from coenzyme Q to cytochrome c, which contains iron. QH2 + 2 cyt c ( Fe 3 + ) ⟶ Q + 2 cyt c ( Fe x ) + 2 H
Determine the oxidation number for iron on the right side of the reaction arrow.
X = ___
Answers
The oxidation number for iron is on the right side of the reaction arrow,
X = 2
Electron Transport Chain or Oxidative phosphorylation is a series of reductions and oxidation reactions to yield ATP, high energy molecules.
The enzyme, which plays a crucial role in creating proton gradient is ATP synthase. The conversion of ADP to ATP releases energy.
In the given chain, coenzyme Q couples with Cytochrome C for the conversion of ADP to ATP.
The species FADH₂ has oxidized and lost the protons to coenzyme Q. The FADH₂ will be converted to FAD.
FADH₂ + Q FAD + QH₂
In the reaction, the enzyme has gained electrons, therefore undergone reduction.
As we know, cytochrome C is the iron-containing enzyme, which is represented as Fe ³⁺. It is present on the reactant side, such that:
The coefficient of Fe ³⁺ is 2. The reaction is given as now:
QH₂ + 2 cyt c (Fe ³⁺) - Q + 2 cyt c (Feˣ ) + 2H⁺
Charge present on the reactant side = 2 x 3 =+6
Also, the species on the product side and the reactant side should have an equal number of charges.
Now, following the law of conservation of mass:
QH₂ + 2 cyt c (Fe ³⁺) - Q + 2 cyt c (Feˣ ) + 2H⁺
From the law, the charge on the product side = Charge on the reactant side
2 x + (+2) = +6
x = 6 - 4
x = 2
Thus, the equation becomes:
QH₂ + 2 cyt c (Fe ³⁺) - Q + 2 cyt c (Fe²⁺ ) + 2H⁺
Therefore, the iron ions have a total of +4 charges and the +2 charges have been contributed by the hydrogen ions on the product side.
The stoichiometric coefficient determines the number of iron ions on the product side is 2, thus, the value of x = +2.
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Carbon Dioxide behaves like the glass windows in the car with the windows wound up. Explain.
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Carbon dioxide behaves like the glass windows in a car with the windows wound up in that it allows light to pass through but prevents heat from passing through. This is because carbon dioxide molecules are transparent to visible light but opaque to infrared radiation, which is the type of electromagnetic radiation that is responsible for heat transfer. When light from the sun hits the Earth's atmosphere, the carbon dioxide molecules in the atmosphere allow the light to pass through and reach the surface of the Earth. However, when the heat from the sun's rays is absorbed by the Earth's surface, the carbon dioxide molecules in the atmosphere prevent the heat from escaping back into space, trapping it in the atmosphere and contributing to the greenhouse effect. This is similar to how the glass windows in a car with the windows wound up allow light to pass through but prevent heat from passing through.
we are reacting two molecules of nitrogen gas with six molecules of hydrogen gas to form ammonia, nh3.
Answers
We can combine two molecules of N2 with six molecules of H2 to create ammonia. One molecule of nitrogen, three molecules of hydrogen, and four molecules of ammonia will make up each gas' total molecules after the reaction is finished.
One molecule of nitrogen and three molecules of hydrogen are required for the ammonia-forming process. The following equation represents the reaction:
N2(g) plus 3H2(g) yields 2NH3 (g)
2N2(g) plus 6H2(g) yields 4NH3 (g)
In the form of four NH3 molecules, they will create a new product. As of right now, the ammonia has been formed from half of the reactants (N2 and 3H2) after the reaction has finished. Consequently, the right response is: 1 N2, 3 H2, and 4 NH3.
This is incomplete question complete question is:
"We are reacting two molecules of nitrogen gas with six molecules of hydrogen gas to form ammonia, NH₃. How many molecules of each type of gas will be present once the reaction has completed?"
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31. An element has 11 protons and 12 neutrons. Which of the following is true of a neutral atom of this element?
A. Its atomic number is 12 and mass number is 23.
B. Its atomic number is 23 and mass number is 11
C. Its atomic number is 11 and mass number is 23.
D. Its atomic number is 23 and mass number is 12.
Answers
Answer:
C.
Explanation:
Because the atomic number is always the number of protons and the mass number is always number of protons + neutrons (since the electrons have little mass)
help plsss mastering chemistry
Answers
The number of moles of Cl₂ gas is equal to 1.83 mol in 130 g of chlorine gas.
What is a mole?A mole can be used to describe a standard unit that is utilized to determine a given count of particles. The particles that can be counted are chemically identical chemical entities, individually distinct.
A mole can be used to calculate quantities such as atoms, molecules, ions, or other particular particles.
Given, the mass of the chlorine gas = 130 g
The mass of one mole of chlorine gas = 71 g/mol
The number of moles of Cl₂ gas = Mass/ molar mass = 130/71 = 1.83 mol
Therefore, the number of moles of chlorine gas is 1.83 mol.
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Study this chemical reaction: 2 AgNO3(aq)+Mg(s) 2 Ag(s)+Mg(NO3 , (aq) Then, write balanced half-reactions describing the oxidation and reduction that happen in this reaction. oxidation: reduction:
Answers
Oxidation is a process of losing electrons and achieving a higher oxidation state.
Reduction is a process of accepting electrons and achieving a lower oxidation state.
The given chemical reaction is as follows:
2AgNO, (aq) +Mg(s)→ 2Ag(s) + Mg(NO3), (aq)
In the above reaction, Ag is accepting one electron and its oxidation state decreases from +1 to 0. Thus, it is getting reduced. Mg is losing two electrons and its oxidation state increases from 0 to +2. Thus, it is getting oxidized.
The reduction half-reaction is as follows:
Ag (aq)+e→Ag(s)
The oxidation half-reaction is as follows:
Mg(s)→ Mg2+(aq) + 2e
Oxidation is a chemical process. It is defined as the process that occurs when an atom or group of atoms loses an electron. Another way of defining oxidation is that a species gains oxygen or loses hydrogen. Oxidation occurs when these events occur.
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Chick, mouse, and human embryos go through a stage during which they have slits and arches in their necks similar to the gill slits and gill arches of fish. Explain what this evidence suggests about evolutionary relationships.
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Explanation:
As it happens, early human embryos do have slits in their necks that look like gills. This is almost certainly because humans and fish share some DNA and a common ancestor, not because we go though a “fish stage” when in our mothers' wombs as part of our development towards biological perfection
Ancestral characters are often, but not always, preserved in an organism’s development. For example, both chick and human embryos go through a stage where they have slits and arches in their necks like the gill slits and gill arches of fish. These structures are not gills and do not develop into gills in chicks and humans, but the fact that they are so similar to gill structures in fish at this point in development supports the idea that chicks and humans share a common ancestor with fish. Thus, developmental characters, along with other lines of evidence, can be used for constructing phylogenies.

7. For each of the following, identify the type of reaction that is represented. Then,
predict the products and write the balanced chemical equations. You do not need to provide the states of the products.
a) HCl(aq) + Mg(OH)2(aq) ->
b) Al₂O3(s) ->
c) Na(s) + Cl₂(g)->
d) NH4Cl(aq) + AgCH3COO(aq) ->
e) Nal(aq) + Br₂(g)->
f) Al(s) + CuCl₂(aq)->
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The type of reaction, the products, and the balanced equation of the reaction can be found below:
Types of reactiona) HCl and [tex]Mg(OH)_2[/tex] react to form [tex]MgCl_2[/tex] and water according to the following balanced equation: [tex]Mg(OH)_2 + 2HCl -- > MgCl_2 + 2H_2O[/tex].
Type of reaction: neutralization reaction.
b)[tex]Al_2O_3[/tex] decomposes to form aluminum metal and oxygen gas according to the following balanced equation: [tex]2Al_2O_3 -- > 4Al + 3O_2[/tex]
Type of reaction: decomposition.
c) Na and [tex]Cl_2[/tex] reacts to form NaCl according to the balanced equation: [tex]2Na + Cl_2 -- > 2NaCl[/tex].
Type of reaction: synthesis
d) [tex]NH_4Cl[/tex] and [tex]AgCH_3COO[/tex] reacts according to the following:[tex]NH_4Cl + AgCH_3COO -- > NH_4Ag + ClCH_3COO[/tex]
Type of reaction: double decomposition
e) NaI and [tex]Br_2[/tex] reacts according to the balanced equation below: [tex]2NaI + Br_2 --- > 2NaBr + I_2[/tex]
Type of reaction: substitution
f) [tex]2Al +3 CuCl_2 --- > 2AlCl_3 + 3Cu[/tex]
Type of reaction = substitution reaction
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The base protonation constant K_b of ammonia (NH_3) is 1.8 times 10^-5. Calculate the pH of a 0.43M solution of ammonia at 25 degree C. Round your answer to 1 decimal place.
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The base protonation constant K_b of ammonia (NH_3) is 1.8 times 10^-5. the pH of a 0.43M solution of ammonia at 25 degree is 2.56.
pH = 1/2 (pkb-loge),pkb =-log (1-8x10¹³) 10= 4.74, Poh = (4.74-logo-43) = 2.56. The pH scale can be considered as a measure of free acidity. pH is defined more exactly as the deleterious record of the hydrogen ion concentration. A pH of 7 is considered neutral even though water has a pH of exactly 7. The pH value of water appears to indicate how acidic or basic
pHs or less 7 indicate acidity, while pHs greater than seven indicate baseness. The pH of water is a measure of the amount of free hydrogen and hydroxyl ions. The pH of a solution is an essential parameter that takes into account its chemical conditions.
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these liquids which mix readily with water (alcohols, aldehydes, esters, ketones, and organic acids) best defines which of the following?
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The liquid that readily mix with water is alcohol due to the solubility.
The functional group of the alcohols is the hydroxyl group, –OH. Unlike the alkyl halides, this group has two reactive covalent bonds, the C–O bond and the O–H bond. The electronegativity of oxygen is substantially greater than that of carbon and hydrogen. Alcohols form hydrogen bonds with water, they tend to be relatively soluble in water. The hydroxyl group is referred to as a hydrophilic (“water-loving”) group, because it forms hydrogen bonds with water and enhances the solubility of an alcohol in water.
Therefore, out of the following options, the liquid that readily mix well with water is alcohol.
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look at the given reaction and use the letter code corresponding to each compound in the blank to indicate the expected product(s) or correct vocabulary word/phrase to complete the description. if a specific stereoisomer (e.g single enantiomer) is formed, select that isomer only. if a mixture of stereoisomers (e.g. racemic or diastereomers) is formed, select the single structure that shows the appropriate mixture (e.g. lines not dashes).
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The stereoisomers are the isomers which have the same composition but differ in the orientation in space.
The stereoisomers are the isomers which have the same molecular formula but have different in the three - dimensional space . the single enantiomers are the one which are not superimposable to the mirror image of each other. this means, the enantiomers of the chemical compound have the same molecular formula but have the differenr spatial arrangement.
The diastereomers are the compounds which have the same molecular formula but they are not mirror image of each other and non superimposable to each other.
The question is incomplete, I answer the question in general according to my knowledge.
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increasing concentration of dissolved co2 raises the of ocean water. group of answer choices basicity fertility salinity acidity turbidity
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increasing concentration of dissolved CO₂ raises the acidity of ocean water.
What happens when CO₂ is dissolved in ocean?The pH of the ocean (a measurement of how acidic or basic the ocean is) decreases when carbon dioxide dissolves in the water, making the water more acidic. Despite the ocean's size, too much carbon dioxide may have a significant effect.
As atmospheric CO₂ levels rise, carbon dioxide dissolves in water to generate carbonic acid (H₂CO₃), which contributes to the acidification of the oceans.
As temperatures increase, carbon dioxide pours out of the ocean like a glass of root beer on a hot day. Deeper waters, which are rich in carbonate dissolved from limestone and other rocks, must be up welled in order to replenish carbonate, which depletes and must be replenished.
So, increasing concentration of dissolved CO₂ raises the acidity of ocean water.
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