Compared with minerals that include the positively charged ions of aluminum, iron, magnesium, and calcium, quartz is less vulnerable to chemical weathering by acidic solutions.
Minerals are naturally occurring inorganic solids with specific chemical compositions and crystal structures formed by geological processes. Rocks are aggregates of one or more minerals, but rocks may also contain organic matter and minerals.
Some rocks are mainly composed of only one mineral. Precipitation and temperature can affect the weather. High temperatures and increased precipitation accelerate chemical weathering. Due to its high chemical stability quartz weathers very slowly. It usually breaks down only into small sand-sized particles.
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nitrogen monoxide is produced by combustion in an automobile engine. according to the following reaction, how many grams of oxygen gas are necessary to form 0.154 moles nitrogen dioxide?
The nitrogen monoxide produced by the combustion in the automobile engine. the grams of the oxygen gas are used to form the 0.154 moles of the nitrogen dioxide is 2.46 g.
The reaction is given below :
2NO + O₂ ---> 2NO₂
2 moles of the NO₂ produce by the 1 moles of O₂
moles of the of NO₂ = 0.154 mol
moles of the O₂ = (1/2) × 0.154
= 0.077 mol
molar mass of O₂ = 32 g/mol
mass of O₂ = moles × molar mass
= 0.077 × 32
= 2.46 g
The mass of oxygen gas needed to form the nitrogen dioxide is 2.46 g.
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from the list below, select four situations in which casting is the preferred fabrication technique. (1) for alloys having low ductilities (2) when it is the most economical fabrication technique (3) when it is needed to join a large variety of metals and alloys (4) for large pieces and/or complicated shapes (5) for economical producing of parts that require very close dimensional tolerances (e.g. bushing and gears) (6) when mechanical strength is not an important consideration (2), (3), (5), (6) (1), (2), (4), (6) (2), (3), (4), (6) (1), (2), (4), (5) (1), (3), (4), (5)
Mechanical strength isn't a key factor when a wide range of metals and alloys need to be joined.
What are the three primary fabrication methods?While many metal fabrication businesses employ a variety of methods, the majority rely on the three fundamental operations of cutting, bending, and assembly.
What is a fabrication, exactly?The following are some illustrations of fabrication or falsification: producing data artificially when it ought to be coming from a real experiment Unauthorized tampering with or fabrication of information, texts, pictures, audio, video, music, or other works.
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25
Mutations are changes in the DNA of an organism. Changes caused by mutations can affect the structure and function of different proteins in the body. Three changes caused by mutations are described below:
Having two different-colored eyes is caused by a mutation that results in increased or decreased pigmentation in one of the eyes. While this mutation affects the coloration of the eye, it does not affect how the eye functions.
Cystic fibrosis is caused by the mutation of a protein in the lungs that causes a sticky mucus to build up in the lung tissue. This build up of mucus can make it difficult for a person to breathe.
Bone density can be affected by a mutation. This mutation can cause very dense bones that are almost unbreakable.
What is true about mutations in organism?
A.
Changes caused by mutations never have an effect on an organism's cells.
B.
Changes caused by mutations can be harmful, beneficial, or neutral to an organism.
C.
Changes caused by mutations always have positive effects on an organism.
D.
Changes caused by mutations always have negative effects on an organism.
Bone density can be affected by a mutation. This mutation can cause very dense bones that are almost unbreakable therefore the true statement about mutations in organism is that changes caused by mutations can be harmful, beneficial, or neutral to an organism which is therefore denoted as option B.
What is Mutation?This is referred to as a change in the DNA sequence of an organism and it occurs when there are errors during cell division.
The changes caused have different effects on the organisms which could be harmful, beneficial, or neutral.
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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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in calorimetry, whatever happens in the system, the exact same change must occur to the surroundings.
In calorimetry, whatever happens in the system, the exact same change must occur to the surroundings is False.
What occurs in calorimetry?
Heat transfer rates to or from a substance are measured using calorimetry. Heat is transferred to do this using a calibrated item (calorimeter). Calculating the quantity of heat transmitted by the process under study requires using the temperature change recorded by the calorimeter.
The sealed calorimeter has thermometers that track temperature changes as a reaction takes place. This closed system functions similarly to a chemical reactor.
It's crucial to realize that in calorimetry difficulties, the material reacting is the "system," whilst the surroundings are made up of water and calorimetry. The heat exchanged between the "system" and "surroundings" is what is measured.
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how many grams of al(s) are needed to produce 154.6 g of al2o3 if the percent yield for this reaction is 87.5%. assume that there is excess o2.
44.98 grams of al(s) are needed to produce 154.6 g of al2o3 .
briefly:-4 Al(s) + 3 O₂(g) → 2 Al₂O₃(s)
mass obtained of an Al₂O₃ (experimental yield) is 154..6 g.
Theoretical yield of an Al₂O₃ is x g.
Calculate the percent yield of Al₂O₃ using the following expression.
%yield = (experimental yield / theoretical yield) × 100%
(154..6 / x) × 100% = 87.8%
theoretical yield= 176.08
molar mass of Al₂O₃ is 101.96 g/mol
mass of Al = 26.98 u*176.08/101.96= 44.98g
How is the yield rate calculated?A bond's yield is a number that represents the return on investment. The formula yield = coupon amount/price can be used to compute yield in its most basic form.
How is yield calculated?Yield calculation methods The stock or bond's market value or original investment should be determined. Identify the profit the investment produced. Subtract the income from the market value. Add 100 to this amount.
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help asha balance the following equation by completing the equation with the correct numbers: co equation c co2
The Balanced Eqn is 2CO+O2→2CO2.
A chemical reaction is a method wherein one or more materials, also called reactants, are transformed into at least one or more special substances, called merchandise. Materials are both chemical elements or compounds.
A few synthesis reactions can result in more than one product. Photosynthesis is one of the maximum important chemical reactions on earth. It allows plants and a few microbes to transform water and carbon dioxide gas into storable sugar and oxygen.
Chemical compounds are made from atoms of different elements, joined collectively through chemical bonds. A chemical synthesis normally involves the breaking of existing bonds and the formation of recent ones.
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What is the maximum theoretical mass of ammonia that can be made from 300g of hydrogen gas?
The maximum theoretical mass of ammonia production from 300g of hydrogen gas is equal to 1700 g.
What is theoretical yield of the chemical reaction?The theoretical yield of the chemical reaction can be explained as the quantity of product formed in a reaction evaluated from stoichiometric calculations.
Given the reaction of the formation of ammonia from hydrogen gas:
3H₂ (s) + N₂ (g) → 2NH₃ (g)
The molecular mass of the ammonia = 17 g/mol
Given the mass of the hydrogen gas = 300 g
The number of moles of the hydrogen gas = 300/2 = 150 mol
From the above equation, 2 moles of ammonia are produced from 3 moles of hydrogen gas.
150 mol of hydrogen gas will produce ammonia = (2/3) ×150 = 100mol
The mass of ammonia is produced = 100 × 17 = 1700 g
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The figure below shows the rotation curves of several spiral galaxies, extending to the very edge of their visible disks. What do these curves tell us about the distribution of dark matter in these galaxies?
Group of answer choices
Most of the dark matter is in the bulge.
Most of the dark matter is in the galaxies’ outskirts.
Most of the dark matter is near stars.
Most of the dark matter is in clumps.
The thing that the curves tell us about the distribution of dark matter in these galaxies is option B: Most of the dark matter is in the galaxies’ outskirts.
Why do galaxy rotation curves suggest the existence of dark matter?Beyond the visible borders of galaxies, the velocity of stars remains relatively constant, suggesting that there must be more matter present than what we can see as stars and gas.
When the impact of DE became noticeable, the rotation curves are shown to dip at a specific distance. r. These flat, v = constant, rotation curve data suggest that the amount of dark matter is increasing linearly with r up to great distances from the spiral galaxies' centers.
From the graph you can see they all pointing or going one direction, hence we can deduce that it is option B.
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using xuv series what can you deduct about relationship between iodized energy and reactivity of metals
Using xuv series, deduct about relationship between iodized energy and reactivity of metals that, The first ionization energy of a metal has little bearing on its reactivity.
Ionization energy, sometimes referred to as ionization potential, is the amount of energy needed to remove an electron from an isolated atom or molecule in physics and chemistry. Ionization energies are related with the removal of each subsequent electron, however they are most frequently employed when the first (and loosely held) electron is removed. In an electric discharge tube, when a quickly moving electron produced by an electric current collides with a gaseous atom of the element, causing it to eject one of its electrons, the ionization energy of a chemical element, given in joules or electron volts, is often measured. A hydrogen atom, which consists of an orbiting electron connected to a nucleus of one proton, requires one ionization energy of 1018 joules (13.6 electron volts) to completely expel an electron. The amount of an element's ionization energy depends on a number of factors, including the size of the atom, its electronic make-up, and the electric charge of its nucleus. Alkali metals are the simplest chemical elements to remove an electron from, whereas noble gases are the most difficult.
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What is ΔH∘rxn for the following chemical reaction?
CO(g)+NH3(g)→HCN(g)+H2O(g)
You can use the following table of standard heats of formation (ΔH∘f) to calculate the enthalpy of the given reaction.
Element/ Compound Standard Heat of Formation (kJ/mol) Element/ Compound Standard Heat of Formation (kJ/mol)
H(g) 218 N(g) 473
H2(g) 0 O2(g) 0
NH3(g) −45.90 O(g) 249
CO(g) −110.5 H2O(g) −241.8kJ
C(g) 71 HCN(g) 130.5kJ
C(s) 0 HNO3(aq) −206.6
Express the standard enthalpy of reaction to three significant figures and include the appropriate units.
To calculate the standard enthalpy of reaction (ΔH∘rxn) for the given chemical reaction, we need to use the equation for enthalpy of reaction, which is:
ΔH∘rxn = Σ(ΔH∘f products) - Σ(ΔH∘f reactants)
where ΔH∘f is the standard heat of formation for a given compound, and the summation symbol (Σ) indicates that we need to sum the values for all of the products and reactants in the reaction.
In this case, we are given the standard heats of formation for the products and reactants in the reaction:
CO(g)+NH3(g)→HCN(g)+H2O(g)
We can use these values to calculate the enthalpy of reaction, as follows:
ΔH∘rxn = Σ(ΔH∘f products) - Σ(ΔH∘f reactants)
= (ΔH∘f HCN + ΔH∘f H2O) - (ΔH∘f CO + ΔH∘f NH3)
= (130.5 kJ + −241.8 kJ) - (−110.5 kJ + −45.90 kJ)
= (−111.3 kJ) - (−156.4 kJ)
= 45.1 kJ
Therefore, the standard enthalpy of reaction for the given chemical reaction is 45.1 kJ to three significant figures. This value represents the amount of heat that is absorbed or released when the reactants are converted into products, and it can be used to predict the energetics of the reaction under standard conditions.
in applying this method to other reactions, could the reactant mole ratio for all reactions be found using this method
The reactant mole ratio for all reactions discovered using this method must be met in order to apply this method to other reactions. Furthermore, the reactant molar ratios for each reaction must be known in order to determine the mole ratio in which the principal reactants react.
To adjust the reaction temperature, water was added to reaction mixtures A through E. In this experiment, KCr,O- was chosen as the source of dichromate ions because it is a strong oxidising agent that is easily converted into dichromate ions.The mole ratio is the ratio of the mole amounts of any two compounds in an equitable chemical reaction. The balance chemical equation compares the ratios of the molecules required to complete the reaction. It calculates how much of one substance is required to produce a certain amount of another substance using the mole ratios between the different parts of the reaction.
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Post-Lab Questions Discuss the outcome of Ihe E1 and E2 reactions for (he following: Which alkene was formed as Ihe major product? Explain thoroughly for full credit; Which alkene was formed as the minor product? Explain thoroughly for full credit;
Both E1 reaction and E2 reaction are more likely to produce 2-methyl-2-butene, instead of 2-methyl-1-butene.Therefore, it makes sense that "2-methyl-2-butene" is the major product while "2-methyl-1-butene" is the minor product because it is not as stable or substituted.
This has happened due of Zaitsev's Rule. Compared to 2-methyl-1-butene, 2-methyl-2-butene's double bond is more heavily replaced. Because it is more stable, 2-methyl-2-butene is more prevalent in the yield. The hydrogen needed to create 2-methyl-2-butene comes from the beta carbon that has undergone the most substitutions. According to Zaitsev's rule, the main product is the one produced as a result of hydrogen being lost during beta distillation, errors being made when weighing and measuring reagents and products, gathering the distillate above 45 C, and alkene products being lost because the alkenes were too close to a heat source. Future investigations should aim to reduce these flaws to obtain more precise results.
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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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Classify the radicals into the appropriate categories. Primary Secondary Tertiary Allylic Answer Bank (CH3)2CHCH2CH2 HC H3C H3C
The formation of free radicals in the organic reaction takes place when the bond is cleavage homolytically. Free radicals are species with a single electron and thus, they are electron deficient in nature.
A free radical may be primary, secondary or tertiary depending upon the number of H-atoms attached to it. Further, the free radicals may be categorized as alkyl, allyl or benzyl radicals.
Primary free radicals: When radical is attached to two H-atoms.
Secondary free radicals: When radical is attached to one H-atoms.
Tertiary free radicals: When radical is not attached to any H-atoms.
Allylic free radicals: When radical is attached to two H-atoms and is in conjugation (resonance) with double bond.
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35. What is the set up used to determine the average atomic mass of Boron in #34?
A. (10 + 11) /2
B. (10 x .20) + (11 x .80)
C. 11 + 10
D. (10 x .20) + (11 x .80) /2
Answer: B
Explanation: 2 isotopes of boron are present.
Let percent abundance of B-10 is x
percent abundance of B-11 is (100-x)
Average atomic mass,
[tex]10.80=\frac{x*10+(100-x)*11}{100}[/tex]
[tex]10.80=\frac{10x+1100-11x}{100}[/tex]
[tex]1080=1100-x[/tex]
[tex]x=20[/tex]
Phenacaine HCI 1% w/v Chlorobutanol 0.5% w/v 1.9% Boric Acid Solution ad 60 mL Make isotonic solution using boric acid. Sig. One drop in each eye. (Please use White-Vicent Method) (a) What are the needed amount of phenacaine HCl and chlorobutanol? (b) What is the required volume of 1.9% boric acid? (c) If you do not have 1.9% boric acid solution and have to compound from boric acid powder
A)The needed amount of phenacaine HCl is 0.6g and chlorobutanol is 0.3 g B) 40.8 ml is the required volume of 1.9% boric acid C) 0.7752 grams you do not have 1.9% boric acid solution and have to compound from boric acid powder
A)for calculating amount. of drug requieed Amount of phenacine Hcl SO = 1% w/v measure 19 in 100 ml
60/100×1g= 0.6 gm
Amount of chlorobutanol = 0.5% w/v means 0.5g in 100 ml.
So 0.5g ⇒100ms
>> 60/100 ×0.5g = 0.39gm
b) so total volume
= Yol
At Vol. B
= 7.2ml + 12
= 19-2nd
So Volume Boric acid
= total volume of solution - volume of drug
= 60ml - 19.2ml
= 40.8gm
c) in this preparation. we need
40.8 ml = 0.4089 of Nac to =0.77529 grams boric acid powder to 40.8 ml
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A chemist decomposes samples of several compounds; the masses of their constituent elements are shown. Calculate the empirical formula for each compound. a. 1.651 g Ag, 0.1224 g O b. 0.672 g Co, 0.569 g As, 0.486 g O c. 1.443 g Se, 5.841 g Br
The empirical formula for each compound are as follow,
a)[tex]Ag_2 O[/tex]
b)[tex]Co_3As_2O_8[/tex]
c)[tex]SeBr_4[/tex]
As per the data share in the above question are as follow,
The mass of their constituent elements are as follow,
a) Ag=1.651 g
O=0.1224 g
b)Co =0.672 g
As =0.569 g
O=0.486 g
c) Se =1.443 g
Br =5.841 g
We have to calculate the empirical formula for each compound.
a)Now Moles of (given mass upon Molar mass) [tex]Ag=\frac{1.651}{108} =0.015 \:moles[/tex]
Moles of [tex]O=\frac{0.1224}{8\times 2} =0.0077 \:moles[/tex]
Smallest mole value [tex]0.0077 \:moles[/tex]
Divide all component by smallest mass.
Therefore [tex]Ag \Rightarrow\frac{0.015}{0.0077} \rightarrow2\\\\O \Rightarrow\frac{0.0077}{0.0077} \rightarrow1[/tex]
Combine to get empirical formula,
[tex]Ag_2 O[/tex]
b)Now Moles of (given mass upon Molar mass) [tex]Co=\frac{0672}{59} =0.011 \:moles[/tex]
Moles of [tex]As=\frac{0.569}{75} =0.0076\: moles[/tex]
Moles of [tex]O=\frac{0.486}{16} =0.0304 \:moles[/tex]
Smallest mole value [tex]0.0076 \:moles[/tex]
Divide all component by smallest mass.
Therefore
[tex]Co \Rightarrow\frac{0.011}{0.0076} \rightarrow1.5\rightarrow1.5 \times 2\rightarrow3\\\\As \Rightarrow\frac{0.0076}{0.0076} \rightarrow1\rightarrow1 \times 2\rightarrow2\\\\O \Rightarrow\frac{0.0304}{0.0076} \rightarrow4\rightarrow4 \times 2\rightarrow8[/tex]
Combine to get empirical formula,
[tex]Co_3As_2O_8[/tex]
c)Now Moles of (given mass upon Molar mass) [tex]Se=\frac{1.443}{79} =0.018 \:moles[/tex]
Moles of [tex]Br=\frac{5.841}{80} =0.073 \:moles[/tex]
Smallest mole value [tex]0.018 \:moles[/tex]
Divide all component by smallest mass.
Therefore
[tex]Se \Rightarrow\frac{0.018}{0.018} \rightarrow1\\\\Br \Rightarrow\frac{0.073}{0.018} \rightarrow4[/tex]
Combine to get empirical formula,
[tex]SeBr_4[/tex]
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Question 4
How many moles of CuSO4 are there in 7.87 x 1024 molecules of CuSO4?
Answer:
8058.88
Explanation:
7.87 x 1024 = 8058.88
duh
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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During the molecular modeling lab, you were told to consider the importance that molecular geometry has on polarity. Which of the following list of molecules would you classify as polar? [Hint: It may be helpful to sketch the structures to determine polarity.] I. PF5 II. SF4 III. SiO2 IV. H2S V. CI2 O II + IV O I + III O III + IV O IV + IO III
Molecules (II) and (IV) that is SF4 and H2S are polar.
In polar molecules, the electron density is unevenly distributed throughout the molecule, resulting in some regions of negative charge and some regions of positive charge. Molecular polarity depends on both individual bond polarities and molecular geometry, the latter of which can be predicted using his VSEPR theory.
Reason :
In molecule (I), molecule is symmetrical all polar bond cancel out polarity of each other so molecule is non-polar.
In molecule (II), molecule is asymmetrical, having a lone pair so molecule is polar.
In molecule (III), molecule is linear, bond polarity cancel out each other, so molecule is non-polar.
In molecule (IV), molecule is bent (asymmetric) having two lone pair, molecule is polar.
In molecule (V), no bond polarity, hence molecule is non-polar.
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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:
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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students in a biology class are studying the effects of temperature on the aquatic plant elodea. They count the number of oxygen. bubbles released by an elodea plant in a beaker of water heated to different temperatures
From the given graph plotting the rate of photosynthesis versus the temperature, the rate of oxygen production is greatest at the point M.
What is photosynthesis?Photosynthesis is the biochemical process of synthesising chemical energy by green plants with the aid of light energy. The photosynthetic reaction involves the combination of carbon dioxide and water producing oxygen gas and glucose.
The chemical energy is stored in plants in the form of glucose which is then break down by the need of energy forming ATP. The photosynthetic reaction is affected by the temperature and pressure of the atmosphere.
From the graph, it is clear that, the rate of photosynthesis is higher at the point M. Higher the rate of photosynthesis, higher will be the oxygen production. Hence, option B is correct.
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States of Matter
Heating Curve Calculation
144.29 g of pentane vapor at 117 °C is cooled
to completely solid at -84 °C.
Heating Curve Data for Pentane
Boiling Point (°C)
Melting Point (°C)
AHp (kJ/mol)
vap
AHfus (kJ/mol)
Specific Heat, gas (J/mol K)
Specific Heat, liquid (J/mol K)
117
-84
45.3
9.3
120
168
How much heat is released
from the system as the
pentane cools?
A 157 kJ
B. 177 kJ
C. 67600 kJ
D. 67.5 kJ
The amount of heat released from the system as the pentane cools is 67.5kJ.
What is the formula for calculating heat absorbed by pentane?To determine the heat released from the system as the pentane cools, we need to consider the heat absorbed or released during each of the phase changes (vaporization and fusion) as well as the heat absorbed or released during the temperature change of the substance in each phase.
The heat absorbed or released during a phase change can be calculated using the enthalpy of vaporization (AHvap) or enthalpy of fusion (AHfus) and the number of moles of substance undergoing the phase change.
The heat absorbed or released during a temperature change can be calculated using the specific heat of the substance and the number of moles of substance and the temperature change.
In this case, we can first calculate the heat absorbed or released during the vaporization of the pentane:
Heat = ΔHvap * moles
Heat = 45.3 kJ/mol * 144.29 g / (58.12 g/mol) = 102.1 kJ
Next, we can calculate the heat absorbed or released during the cooling of the pentane vapor to the melting point:
Heat = specific heat * moles * temperature change
Heat = 168 J/mol K * 144.29 g / (58.12 g/mol) * (117 - (-84)) K = 68400 J = 68.4 kJ
Then, we can calculate the heat absorbed or released during the fusion of the pentane:
Heat = ΔHfus * moles
Heat = 120 kJ/mol * 144.29 g / (58.12 g/mol) = 270 kJ
Finally, we can calculate the heat absorbed or released during the cooling of the pentane from the melting point to the final temperature:
Heat = specific heat * moles * temperature change
Heat = 168 J/mol K * 144.29 g / (58.12 g/mol) * (-84 - (-84)) K = 0 J
The total heat released from the system can be calculated by adding up the heat absorbed or released during each of these processes:
Total heat = 102.1 kJ + 68.4 kJ + 270 kJ + 0 kJ = 440.5 kJ
The correct answer is therefore D) 67.5 kJ.
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For each trial, calculate the moles of KHP used to neutralize the NaOH solution and put the answer in the Results Table. (Hint: Use the correct formula from the Discussion section to calculate the molar mass of KHP! It is NOT the mass of K + H + P!)
For each trial, using the mole ratio from the balanced equation, calculate the moles of NaOH and put the answer in the Results Table.
For each trial, calculate the molar concentration of the NaOH solution and put the answer in the Results Table. (See example in the discussion.)
Calculate the average molarity and enter this answer in your Results Table.
Submit your Results Table and Calculations in the following corresponding question boxes.
1.Moles of KHP for Trial 1,2,3,4
2.Moles of NaOH for Trial 1,2,3,4
3.Molarity of NaOH (M) for trial 1,2,3,4
4. Average Molarity of NaOH (M)
1. The number of moles of KHP is found by dividing the mass of KHP by the molecular weight of KHP.
2. The number of moles of NaOH is found by multiplying the moles of KHP by the mole ratio of NaOH to KHP given by the above, balanced chemical reaction.
It will be presumed that more KHP is present in the solution if additional NaOH is added. As a result, the % KHP will be higher than anticipated. If the concentration of NaOH is doubled, just half the volume from the initial experiment is needed. To titrate NaOH with KHP, add NaOH from the burette to a predetermined amount of KHP. The mass and volume of KHP utilized to create the KHP solution are used to calculate the molarity of the KHP solution. The molarity of the NaOH is then determined using the information from the titration.
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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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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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Nuclides below the valley of stability can become more stable through which of the following processes?
A) beta emission
B) positron emission
C) gamma emission
D) electron capture
E) neutron bombardmentB) positron emission
Nuclides below the valley of stability can become more stable through positron emission.
A positron emission tomography (puppy) test is an imaging check which can assist reveal the metabolic or biochemical feature of your tissues and organs. The puppy test uses a radioactive drug (tracer) to reveal both ordinary and abnormal metabolic pastime.
A positron is the anti-particle of a beta particle, and is emitted with the aid of a proton-rich nucleus. The collision of an electron and a positron yields two 0.511 MeV gamma rays. Positron gamma radiation can penetrate via inches of iron, concrete, timber, plastic, water, and many others.
They're converted into two high-electricity gamma rays moving immediately faraway from every other.
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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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