The chemical equation that is balanced is:
2 KClO3 ( s )+ MnO2 (s)→ 2 KCl ( s ) + 3 O2 (g)
Potassium chlorate (s) when heated in the presence of a manganese dioxide catalyst: When heated in the presence of a manganese dioxide catalyst, potassium chlorate (s) decomposes to create potassium chloride and oxygen gas.
The chemical equation that is balanced is:
2 KClO3 ( s )+ MnO2 (s)→ 2 KCl ( s ) + 3 O2 (g)
When potassium chlorate (KClO3) is heated in the presence of manganese dioxide catalyst, it decomposes to form potassium chloride and oxygen gas. The reaction is termed as decomposition reaction.
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Determine the name of the chemicals involved:
Cs₂CO₃
SrI₂
SrCo₃
CsI
When naming ionic compounds, the cationic part or the metal is named first. The name of Cs₂CO₃ is cesium carbonate and the name of SrI₂ is strontium iodide. SrCO₃ is named as strontium carbonate and CsI is cesium iodide.
What is chemical formula?Chemical formula of a compound is the simplest way to represent the compound. Chemical formulas help to identify and distinguish the compound easily.
The ionic compounds are named starting with the cationic part and secondly the anionic part. For example, the compound Cs₂CO₃ is named starting with the metal part cesium then the anionic part carbonate. Thus, its name is cesium carbonate.
Similarly the two compounds of strontium are named as, SrI₂ - strontium iodide and SrCO₃ as strontium carbonate.
The ionic compound, CsI is named as cesium iodide.
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Find the pH value after adding 0.05 M of sulfuric acid to a solution consisting of 0.1 M of weak acid and its salt. Note that the value of the weak acid dissociation constant is 4.47
The pH value after adding 0.05 M of sulfuric acid to a solution consisting of 0.1 M of weak acid and its salt is o.91.
What is pH ?The pH scale determines how acidic or basic water is. The range is 0 to 14, with 7 representing neutrality. Acidity is indicated by pH values below 7, whereas baseness is shown by pH values above 7. In reality, pH is a measurement of the proportion of free hydrogen and hydroxyl ions in water.
Ka = [ H⁺ ] [ B⁻ ] / [ HB ]
HB = H⁺ + B⁻
Ka = 4.47
C= 0.1
x = ( - 4.47 + (4.47 )² + 4 ( 0.1 ) ( 4.47 )²/2
= 15.51 + 0.844 / 2
= 16.354/ 2
=8.177
pH = - log [ H⁺ ]
= - log ( x )
= -log ( 8.177 )
pH = 0.91
Thus, The pH value after adding 0.05 M of sulfuric acid to a solution consisting of 0.1 M of weak acid and its salt is o.91.
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One step in the synthesis of occidentalol, a natural product isolated from the eastern white cedar tree, involved the following reaction. Draw the structure of A (use hashed wedged bonds to denote endo bonds and wedged bonds to denote exo bonds).
Formation of A In the preceding technique, 4-methylcyclopenhexa-3-enone (dienophile) reacts with a cyclic diene to create a bicyclic product with two rings fused. This reaction is known as the Diels-Alder reaction. This coordinated reaction can be represented as shown in the image attached.
Consequently, the procedure outlined above shows how the Diels-Alder reaction results in product A. As a result, A's structure is shown in the following way.
From A, change to B
Due to compound A's tricyclic fused ring with two six-membered rings, a carbon dioxide molecule is destroyed when it is heated, coupled with a decarboxylation electrocyclic pericyclic reaction.
On Earth, organic molecules make up every living thing. Molecules are made up of bonded atoms. All living things contain organic molecules, which are the majority of carbon-containing compounds.
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How did the discovery of radioactive decay invalidate many of the early models
Which way would electrons and ions flow in the voltaic cell in Part 1? Recall the voltaic cell is made using aluminum and tin electrodes immersed in a 1.00 Msolution of Al3+and Sn2+ Items (3 items) (Drag and drop into the appropriate area below Anions Electrons Cations Categories Toward Al electrode Toward Sn electrode
The anode and cathode, or the oxidation and reduction halves of the cell, always exchange electrons. The electrons will move from the more negative half reaction to the more positive half reaction in an Eocell of the half reactions.
How do you tell a voltaic cell's positive and negative terminals apart?The electrochemical series' lower-ranking metal will become the positive terminal. The positive ions in the electrolyte will receive the released electrons from the positive terminal. The negative terminal of a voltaic cell is called the anode, and the positive terminal is called the cathode.
What directions do cations and electrons flow in?Electrons in the wire and electrodes carry electrical current, although it is transported by opposingly moving anions and cations within the cell. Oxidation takes place at the anode because it can accept electrons.
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peroxyacids (rco3h) can convert alkenes into epoxides. draw the two products and the mechanism arrows for the following reaction. be sure to include lone pairs of electrons and nonzero formal charges on all species.
Please draw everything exactly as i would draw it in the box.
A peroxyacid is an acid containing an acidic -OOH group.
The two main classes are those derived from mineral acids in general, particularly sulfuric acid, and the peroxy derivatives of organic carboxylic acids. They are generally strong oxidants. Peracids are mainly used as oxidizing agents. It is used to readily add oxygen to alkenes to form epoxides and convert ketones to esters and amines to nitro compounds, amine oxides, or nitroso compounds.
Peroxycarboxylic acids have the unique property of having an electropositive oxygen atom in the COOH group. This reaction is initiated by an electrophilic oxygen atom that reacts with a nucleophilic carbon-carbon double bond. The mechanism involves a concerted reaction with a four-part cyclic transition state.
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A mixture of 1.0 mol of He and 1.0 mol of Ne at STP are placed into a rigid container. Which of the following statements are true for the system? a. Both gases have the same molecular speed
b. All of the above are true c. Both gases contribute equally to the density of the mixture d. Both gases have the same average kinetic energy e. The mixture has a volume of 22.4L
The true statement is d. Both gases have the same average kinetic energy. Since the gases are at the same temperature in this situation, they will have the same average kinetic energy.
The average kinetic energy of a gas is determined by the temperature of the gas. The molecular speed of a gas is determined by the temperature of the gas and the mass of the gas molecules. Helium and neon have different atomic weights, so their molecular speeds will be different at the same temperature. The density of a gas is determined by the number of molecules and the volume they occupy. If the number of molecules of each gas is equal, but the atomic weights of the gases are different, then the density of the mixture will be different from the densities of the individual gases.
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6. (1 pt) refer to the synthetic sequences below. in the step with thionyl chloride explain if hexamethylphosphoric triamide (hmpt) or 1,4-dioxane was added along with thionyl chloride. provide a specific rationale.
Hexamethylphosphorous triamide is useful as a reagent in organic synthesis as a phosphorylating agent. It is engaged with carbon tetrachloride for the substitution of hydroxy groups with chlorides.
It is jumbled in the preparation of epoxides and arene oxides from aldehydes and aryldialdehdyes respectively. It is used in the composing of carbonates as well as the reduction of ozonides.
Air and moisture sensitive. Keep the container tightly direct in a dry and well-ventilated place. clashing with strong oxidizing agents.
lower aromatic aldehydes to symmetrical epoxides in good yield. Both cis- and trans-isomers are formed.
Under suitable conditions, the reaction of the intermediate with a second aldehyde can lead to mixed deoxybenzoins or diaryl enamines.
Has also been used for a variation of other reductions including that of ozonolysis intermediates: Helv. Chim. Acta, 50, 2387 (1967), and of primary alkyl nitro compounds to nitriles: Synthesis, 36 (1979).
Bromohydrins can be change to alkenes, by reductive elimination from their triflate esters
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the dayton accords multiple choice brought the deployment of peacekeeping troops to bosnia. ended the soviet invasion of afghanistan. ended the placement of soviet missiles on cuban soil. established the coalition that attacked iraq in the persian gulf war in 1990. brought a peaceful dissolution of the soviet union.
The Dayton accords brought the deployment of peacekeeping troops to Bosnia and is therefore denoted as option A.
What is Dayton accord?This is referred to a peace agreement which was reached on Nov. 21, 1995 in which warring parties agreed to peace and to a single sovereign state known as Bosnia and Herzegovina.
This type of accord was led to the deployment of peacekeeping troops to the area in other to tackle the conflict and ensures that human right due to the killings and other vices which occurred during this period and is still maintained thereby making option A the correct choice.
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joseph decides to test the idea of his friend carl that heating certain compounds releases a strange new gas with interesting properties (e.g. it is exhilirating to breathe). he carefully weighs out a number of samples and puts them in sealed tubes, then heats them until they stop changing, then records the new weights. by subtracting the weights he is able to tell whether an invisible gas released during the
Experiment is a scientific procedure carried out to test an idea or hypothesis. It provide insight about the cause and effect.
joseph decides to test the idea of his friend carl that heating certain compounds releases a strange new gas with interesting properties. he carefully weighs out a number of samples and puts them in sealed tubes, then heats them until they stop changing, then records the new weights. by subtracting the weights he is able to tell whether an invisible gas released during the Experiment. An experiment is a procedure carried out to support or refute a hypothesis, or determine the efficacy or likelihood of something previously untried. Experiments provide insight into cause-and-effect by demonstrating what outcome occurs when a particular factor is manipulated.
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which of the following options correctly describe the processes occurring at the anode of a galvanic cell? select all that apply.
1. oxidation takes place at the anode
2. The anode is the source of electrons in the current flow
The correct option is both 1and 2, oxidation takes place at the anode of the galvanic cells and it also the source of electrons in current flow.
Oxidation process happens at the anode, and reduction process happens at the cathode. The anode is the negative terminal for the galvanic cell because the reaction at the anode is the source of the electrons for current.
The movement of electrons from one substance to another is what propels the process. Thermodynamics is in favor of this. The completion of the circuit in a galvanic cell or battery creates a pathway for the substance at the anode (oxidation) to transfer electrons to the substance at the cathode through the circuit (reduction).
A galvanic cell is a type of electrochemical device that generates an electric current by transferring electrons during the redox processes.
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For the following reaction, the reactants are the favored species at equilibrium. Classify each of the reactants and the products based on their strength as Bronsted-Lowry acids or bases.
HCN + C9H7N --><-- CN- + C9H7NH+
HCN
C9H7NH+
C9H7N
CN-
Stronger Bronsted-LowrTy acid
Weaker Bronsted-Lowry acid
Stronger Bronsted-Lowry base
Weaker Bronsted-Lowry base
At equilibrium, HCN is weaker Bronsted-Lowry acid, C₉H₇NH⁺ is stronger Bronsted-Lowry acid, C₉H₇NH is weaker Bronsted-Lowry base and CN⁻ is stronger Bronsted-Lowry base.
CN⁻ + C₉H₇NH⁺ → HCN + C₉H₇N
Products are favored. So, CN⁻ accepted the proton instead of C₉H₇N and C₉H₇NH⁺ lost its proton instead of HCN.
C₉H₇NH⁺ - stronger Bronsted-Lowry acid
C₉H₇N - weaker Bronsted-Lowry base
HCN - weaker Bronsted-Lowry acid
CN⁻ - stronger Bronsted-Lowry base
So, at equilibrium, HCN is weaker Bronsted-Lowry acid, C₉H₇NH⁺ is stronger Bronsted-Lowry acid, C₉H₇NH is weaker Bronsted-Lowry base and CN⁻ is stronger Bronsted-Lowry base.
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in the balanced equation for the reaction of fe2(so4)3 and lioh, which of the following compounds will precipitate out of solution?
Many anions-containing substances, including sulfide (S2), hydroxide (OH), carbonate (CO32), and phosphate (PO43), are frequently insoluble in water. If one of these anions is dissolved in a solution with a metal cation like Fe2+, Cu2+, or Al3+, a precipitate will result from the addition.
What do you call a precipitate that forms from a solution?
An insoluble solid that separates from a liquid solution is known as a precipitate in chemistry. Precipitation is the term used to describe the insoluble solid emerging from the solution. Most frequently, the precipitate appears as a suspension.
What kind of product will precipitate?
If the resultant chemical is water insoluble, a precipitate will develop. As an illustration, a solution of magnesium bromide is combined with a solution of silver nitrate (AgNO3) (MgBr2).
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since, as the temperature of a gas sample increases, the velocity distribution of the molecules shifts toward a blank velocity and becomes blank sharply peaked, temperature blank is greater.
As the temperature of a gas sample increases, the velocity distribution of the molecules shifts towards higher velocities and becomes less peaked.
This is due to the fact that the average kinetic energy of the molecules increases with increasing temperature. Since the molecules have more energy, their velocities become more spread out, and the peak of the velocity distribution shifts to the right.
This means that the fastest molecules are moving faster than before. At the same time, the spread of the distribution becomes tighter, resulting in a sharper peak. This is because the molecules are more likely to move at the same speed, so the fraction of them moving at any given speed is much higher.
This effect is most pronounced at higher temperatures, as the molecules have more energy to spread out in a larger range of velocities.
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write chemical equations that show how the following bases react with water to produce hydroxide ions: (use the lowest possible coefficients. be sure to specify states such as (aq) or (s). if a box is not needed, leave it blank.) a question content area methoxide ion (), a strong base + b hypobromite ion (Bro), a weak base + C imidazole (CH.N2), a weak base + +
When bases react with water they produce hydroxide ions
OCH₃⁻ + H₂O → CH₃OH (methanol) + OH⁻ (hydroxide)
here, the methoxide ion acted as a base, by bonding with the hydrogen atom released by water to form methanol and hydronium ion
Br − + H ₂ O⇄ 2 HOBr + OH −
C₃H₂N₄+O₂+ H₂O→ CO2 + H2O + NH3
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Positive sodium ions (Na+) and negative hydroxide ions are produced when the base sodium hydroxide (NaOH) dissolves in water. The chemical formula NaOH H 2 O OH- + Na can be used to symbolise this.
When a substance dissolves in water, it emits negative nonmetal ions and positive hydrogen ions (H+), which are the byproducts of the reaction. Atoms that have gained or lost electrons are known as ions, which are charged particles. An acid is anything like hydrochloric acid (HCl). When it dissolves in water, it releases positive hydrogen ions and negative chloride ions (Cl-). The chemical equation: can be used to illustrate this.
HCl _H2o__ H+ + Cl-
When a substance dissolves in water, it releases positive metal ions and negative hydroxide ions (OH-). This is what is known as a base. One such instance is the formation of negative hydroxide ions and positive sodium ions (Na+) when the base sodium hydroxide (NaOH) dissolves in water. The chemical equation: can be used to illustrate this.
NaOH _H2o__ OH- + Na+
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27. Which of the following best describes the properties of protons, neutrons, and electrons
A. Protons and neutrons have the same mass; the mass of an electron is very close to zero
B. Protons and electrons have the same mass; the mass of a neutron is double the mass of a proton
C. Protons, neutrons, and electrons all have the same mass.
D. Neutrons and protons have the same mass; the mass of an electron is half the mass of a proton
Answer:
A. Protons and neutrons have the same mass; the mass of an electron is very close to zero
Explanation:
the half equivalence point is in the middle of the buffer region. in order to reach the half equivalence point in their titration, veronica needed to add 24.47 ml of koh to 50.00 ml of 0.368 m hf. what is the concentration of conjugate base at the half equivalence point? note: do not use scientific notation or units in your response. sig figs will not be graded in this question, enter your response to four decimal places. carmen may add or remove digits from your response, your submission will still be graded correctly if this happens.
pH = pKa M - moles/L 0.447 = m at the half-equivalence point, which is equal to 0.1537 M F.
How may an equivalency point be found?The equivalency point for acid-base titrations is extremely simple to identify. To create a titration curve, different quantities of titrant are added, and then the pH of the solution is measured using a pH meter. Then, the curve's equivalence point can be determined.
What are an endpoint and an equivalency point?A point of equivalency in a titration is the point at which the additional titrant and the sample analyte have chemically equivalent properties. On the other hand, the endpoint is when the color of the solution changes.
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investigation you had to calculate the number of moles of oxygen gas produced from a reaction of 2h2o2 (aq) 2h2o (l) o2 (g) using the ideal gas law. which of the following is the ideal gas law equation?
Using the ideal gas law, 0.0025 moles of oxygen gas are created when 2H2O2 (aq) reacts with 2H2O (l) and O2 (g).
Given that, according to the balanced chemical equation, hydrogen peroxide, H2O2, breaks down to produce water and oxygen gas:
2H2O2 (aq) -> 2H2O (l)+ O2 (g)
Ideal temperature (t) = 295.15 K and
pressure (p) =1 atm
Volume of oxygen gas (v) = 0.061 L
R = 0.0821
From the ideal gas law equation = pv= nRt
n = pv/Rt = 1 x 0.061/0.082x 295.15
n = 0.0025moles
Hence the number of moles produced from the above reaction is 0.0025
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the product of the following reaction has the constitution shown. no stereochemistry is implied. deduce the stereochemistry on the basis of the fact that iodolactonization is normally an anti addition and it was determined experimentally that the ring junction is cis. select the single best answer. 1935 1935c 1935a 1935d 1935b
The product of the following reaction has the constitution shown. No stereochemistry is implied. If the stereochemistry on the basis of the fact that iodolactonization is normally an anti addition and it was determined experimentally that the ring junction is cis then the correct option is Option A.
Since ring junction is cis means it Should be axial, equatorial or equatorial, axial.
And addition of Iodine is anti, that means iodine and ring junction are trans, it should be axial, axial or equatorial, equatorial position of Iodine and one of ring junction.
Note: 1,2-cis - axial, equatorial or equatorial, axial
1,2-trans: axial, axial or equatorial, equatorial
So, The constitution is revealed in the result of the given reaction. There is no implication of stereochemistry. Option A is the correct option if the stereochemistry is based on the knowledge that iodolactonization is generally an anti addition and the ring junction was determined empirically to be cis.
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The half-reaction that occurs at the anode during the electrolysis of molten sodium bromide is a. 2Br^- rightarrow Br_2 + 2e^- b. Br_2 + 2e^- rightarrow 2Br c. Na^+ +e^- rightarrow Na d. Na rightarrow Na^+ + e^- e. 2H_2O + 2e^- rightarrow 2OH^- + H_2
The half-reaction at anode in the electrolysis of molten sodium bromide is b).2 Br- ------------> Br2 + 2e-
The electrolysis of molten sodium bromide involves passing a direct current through a molten NaBr solution. The positively charged cations (Na+) move towards the cathode where they gain electrons and become neutral atoms.
At the anode, the negatively charged bromide ions (Br-) are oxidized and the bromine atoms are released. The bromide ions are also reduced to form hydrogen gas.
At the same time, the electrons released at the anode combine with the sodium atoms to form sodium hydroxide, which is released as a liquid in the solution. This process can be used to produce hydrogen, sodium hydroxide, and bromine.
At anode : Oxidation reaction takes place
2Br⁻ ------------> Br₂ + 2e⁻
At Cathode : Reduction reaction takes place
2Na⁺ + 2e⁻ --------------> 2Na
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Water is a polar solvent and hexane ( (C 6H 14) s a nonpolar solvent. Which of the following correctly describes the solubility of the solute? o octane (nonpolar), soluble in water O Cacl2, soluble in hexane O CCl4 (nonpolar), soluble in water O mineral oil (nonpolar), soluble in water O NaHCO3, soluble in water
NaHCO3 is soluble in water. NaHCO3 is ionic polar compound. water is polar quantities so, polar disolve in polar.
The basic concept of solubility is that like dissolves like. It means that polar substances are soluble in polar solvents and non-polar substances are soluble in non-polar solvents.
Solubility is described as the most amount of a substance so that it will dissolve in a given amount of solvent at a exact temperature. Solubility is a function property of a particular solute–solvent aggregate, and unique substances have substantially differing solubilities.
Solubility is the ability of a substance (solute) to form a solution with another substance (solvent). Insolubility is the opposite property, the inability of a solute to form such a solution.
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Isopentyl acetate (C7H14O2) is the compound responsible for the scent of bananas. A
molecular model of isopentyl acetate is shown in the margin below. Interestingly, bees
release about 1 mg (1 3 1026
g) of this compound when they sting. The resulting scent
attracts other bees to join the attack. How many molecules of isopentyl acetate are
released in a typical bee sting? How many atoms of carbon are present
The number of molecules in 1 g of isopentyl acetate, C₇H₁₄O₂ is 4.21 * 10²¹ molecules.
What is the number of molecules in one gram of isopentyl acetate?Isopentyl acetate is a compound that is known as an alkanoate.
An alkanoate is a compound that is formed when an alkanol and an alkanoic acid react together, water is also produced.
The number of molecules in one gram of isopentyl acetate is determined from the molar mass of isopentyl acetate.
In one mole of isopentyl acetate, the number of molecules present is equal to the Avogadro number of molecules which is 6.02 * 10²³ molecules.
The molar mass of isopentyl acetate, C₇H₁₄O₂ = (12 * 7 + 1 * 14 + 16 * 2) g/mol
The molar mass of isopentyl acetate, C₇H₁₄O₂ = 130 g/mol
The number of moles in 1 g of isopentyl acetate, C₇H₁₄O₂ = 1/130
The number of moles in 1 g of isopentyl acetate, C₇H₁₄O₂ = 0.0077 moles
Number of molecules in 1 g of isopentyl acetate, C₇H₁₄O₂ = 0.0077 * 6.02 * 10²³
The number of molecules in 1 g of isopentyl acetate, C₇H₁₄O₂ = 4.21 * 10²¹ molecules.
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A chemist conducts an experiment in which 2.0 L of hydrogen gas is collected over water at 1 atm and 298 K. The phrase 'over water" means that the gas was collected by bubbling it into an inverted bottle filled with water, which is sitting in a water bath. The gas is trapped in the bottle, displacing the water into the water bath. However, the gas collected is now saturated with water vapor. The partial pressure of water vapor at 298 K is 0.03 atm. Using Dalton's Law, calculate the pressure of the hydrogen gas in atm.0.97 atm
The volume of the hydrogen gas in atm.0.97 atm is 1.78 L.
An ideal gas is a theoretical gas composed of many randomly transferring factor particles that aren't difficult to interparticle interactions. the best gasoline idea is beneficial because it obeys the precise gas law, a simplified equation of country, and is amenable to evaluation under statistical mechanics.
An ideal gas is described as one for which both the extent of molecules and forces between the molecules are so small that they have got no effect at the behavior of the gas. The real gas that acts almost like a really perfect gasoline is helium. that is due to the fact helium, in contrast to maximum gases, exists as an unmarried atom, which makes the van der Waals dispersion forces as low as viable
Caculation:-
P1= 0.97 atm
V1= 2 L
T1= 298 K
P2= 1 atm
V2= ?
T2= 273 atm
V2 = 0.97 atm × 2 L × 273 /298 k
= 1.78 L
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one of the steps in the biological pathway for carbohydrate metabolism is the conversion of fructose 1,6-bisphosphate into dihydroxyacetone phosphate and glyceraldehyde 3-phosphate. draw curved arrows to show the movement of electrons in this step of the reaction mechanism.
steps in the biological pathway for carbohydrate metabolism is First and foremost, the base B abstracts a proton from the hydroxy group of carbon 4 .The image depicts further electron transfer (bond shifting), and the electron eventually resides on the electronegative oxygen atom.
A step from the mechanism of interconversion of D gluconic acid and D mannonic acid is given in the following reaction. The reaction is an epimerization reaction in which one of the carbon configurations changes. In the step described here, base A- abstracts a proton from the hydroxyl group, causing the electron pair to shift as shown in the image. The chemical adjusts that take place within a cell or organism. These adjustments create power and the equipment that cells and organisms necessitate to develop, replicate, and keep themselves alive. A fast metabolism does not necessarily imply thinness. In fact, studies have shown that people who really are overweight or obese frequently have fast metabolisms.
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q1. silver nitrate 1:500 w/v solution 60 ml make isotonic solution using nacl sig. for eye use (please use both e value and white-vincent method)
Silver nitrate 1:500 w/v solution 60 ml make isotonic solution using nacl sig. for eye use The method's equation is V=E x W(g)x (100mL) (0.9g)
Isotonic solutions are those that have the exact same water and solute concentrations as the cytoplasm of a cell. Since there is no net gain or loss of water, cells placed in an isotonic solution won't either contract or expand.
The Greek word isotonic, which approximately translates to equal or same tone. In an article on medicine.net, isotonic exercise causes the muscle to shorten while maintaining equal tone. Thus, throughout the activity, your muscles are under the same tension.
Isotonic solutions are used to increase the volume of extracellular fluid lost as a result of blood loss, surgery, dehydration, and fluid loss.
IV fluids known as isotonic solutions have a comparable level of dissolved particles to blood. Normal saline, or 0.9% sodium chloride, is an illustration of an isotonic IV solution.
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The temperature in the stratosphere is -25.0C. Calculate the root mean square speeds N2,O2,and O3 molecules in this region.Be sure each of your answers entries has the correct number of significant digits
Answer:
To calculate the root mean square speeds of N2, O2, and O3 molecules in the stratosphere, we need to use the formula vrms = (3RT/M)^1/2, where vrms is the root mean square speed, R is the gas constant, T is the temperature in Kelvin, and M is the molar mass of the gas.
First, we need to convert the temperature in Celsius to Kelvin by adding 273.15 to the temperature in Celsius. This gives us a temperature of -25.0 + 273.15 = 248.15 K.
Next, we need to calculate the root mean square speeds of N2, O2, and O3 molecules. The molar masses of these gases are 28.0134 g/mol for N2, 31.9988 g/mol for O2, and 48.0027 g/mol for O3. Using the formula above, we get the following root mean square speeds:
N2: vrms = (3 * 8.3145 * 248.15 / 28.0134)^1/2 = 446.8 m/s
O2: vrms = (3 * 8.3145 * 248.15 / 31.9988)^1/2 = 402.4 m/s
O3: vrms = (3 * 8.3145 * 248.15 / 48.0027)^1/2 = 303.1 m/s
Therefore, the root mean square speeds of N2, O2, and O3 molecules in the stratosphere at a temperature of -25.0C are 446.8 m/s, 402.4 m/s, and 303.1 m/s, respectively.
What are the mass numbers for the two nitrogen isotopes?
N-14
N-15
N-25
N-13
The 2 isotopes of Nitrogen are Nitrogen-14 and Nitrogen-15 .
What are isotopes?Isotopes are atoms with the same number of protons and different number of neutrons. Even though they have nearly identical chemical properties, they differ in mass which affects their physical properties.
As you know, the atomic number of nitrogen is = 7.
Isotopes are forms of elements that have the same atomic number (Z) but different mass numbers because they have different numbers of neutrons (A).
Now,
Atomic number = number of protons
Isotopes have the same atomic number.
Atomic number for both isotopes = 7. However, the mass numbers of the two isotopes are different.
In other words, the mass number = the number of (protons + electrons).
Therefore, nitrogen-14 has a mass number of 14 and nitrogen-15 has a mass number of 15.
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In which of the following cases would recrystallization be favored over extraction when purifying a mixture of two solid compounds? 1. When both compounds have the same functional group(s). II. When the desired compound is poorly soluble in the solvent pair at low temperatures and greatly soluble in the solvent pair at high temperatures. III. When there is a significant excess of the desired compound. A. I and III B. II C. II and III D. I and II E. All of the above F. None of the above
The following cases would recrystallization be favored over extraction when purifying a mixture of two solid compounds is II. Option B.
A compound is a substance in which two or more different chemical elements are combined in a certain ratio. When elements come together, they react with each other to form unbreakable chemical bonds.
The definition of recrystallization is a compound purification technique in which a compound is dissolved in a solvent and slowly cooled to form crystals that represent a purer form of the compound. Scientists use recrystallization to purify solids usually products from various chemical reactions in a compound are dissolved.
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while waiting for approval to conduct a clinical trial using peptides 1 and 2, you consider three possible outcomes that might result. you sketch out what the data would look like for each. match each possible outcome with the correct conclusion. for help interpreting the graphs, see hint 1.
Both Peptide 1 and Peptide 2 are effective as toxin concentration in the graft is minimum. So, Peptide 1 is an effective inhibitor of the pathway, and peptide 2 is an effective inhibitor of the TRAP pathway in human infection.
Along the same lines, peptide 2 is an effective inhibitor of the TRAP pathway in human infection, but Peptide 1 is NOT an effective inhibitor of the AGR pathway in human infection. Similarly: Peptide 1 is an effective inhibitor of the AGR pathway, however, peptide 2 is NOT an effective inhibitor of the TRAP pathway in human infection. A peptide is a short chain of amino acids (commonly 2 to 50) connected by substance bonds (called peptide bonds). A more extended chain of connected amino acids (at least 51) is a polypeptide. The proteins fabricated inside cells are produced using at least one polypeptide.
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3) which of the following can represent a buffer: a) hcl (strong acid) and nacl b) h2co3 (weak acid) and na2co3 c) h2o and hcl (strong acid) d) ch3cooh (weak acid) and kch3coo
The correct answer which can represent buffer is d) CH3COOH (weak acid) and KCH3COO.
A buffer is a solution that resists changes in pH when acids or bases are added. A buffer is made up of a weak acid and its conjugate base, or a weak base and its conjugate acid. The weak acid and its conjugate base form a buffer because when the weak acid is added, it is partially neutralized by the conjugate base, and when the weak base is added, it is partially neutralized by the conjugate acid.
When CH3COOH (weak acid) and KCH3COO (potassium salt of the weak acid) are in solution, the CH3COOH is partially neutralized by the KCH3COO, making it an effective buffer.
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