can someone help me pls ,,
Balance the following equations
1. N2O5 -> N2O4 + O2
2. KNO3 -> KNO2 + O2
3. NH4NO2 -> N2 + H2O
4. O3 -> O2
5. Zn + AgCl -> ZnCl2 + Ag
6. NaOH + H2SO4 -> NA2SO4 + H2O
Answers
Answer:
Explanation:
Rather than doing all the reactions, let's look at one in detail and develop a process for answering the rest.
Start with a pencil and paper. Pencil, because balancing equations requires some initial guesses that often need to be changed (erased).
Make a table such as shown on the attached worksheet. The first problem is demonstated on the attachment.
1. N2O5 -> N2O4 + O2
2N2O5 -> 2N2O4 + 1O2
2. KNO3 -> KNO2 + O2
We only need 1 K and 1 N for the producrs, and 1 KNO3 supplies that number. But 1 KNO3 has 3 O atoms, while the only place for the O atoms to go is )2, a diatomic molecule. To obtain 2O for the 1O2, we need to change the KNO3 coefficient to 2:
2KNO3 -> KNO2 + O2
Now change the KNO2 coefficient to 2 (to accomodate the 2 K and 2 N atoms):
2KNO3 -> 2KNO2 + O2
The reactants have 6 O atoms, so we should be balanced:
2KNO3 -> 2KNO2 + O2
K 2 2
N 2 2
O 6 4+2 = 6
3. NH4NO2 -> N2 + H2O
NH4NO2 -> N2 + 2H2O
N 2 2 0
H 4 0 4
O 2 0 2 Everything is balanced
4. O3 -> O2
O3 -> O2
2O3 -> 3O2
6 O 6 O
5. Zn + AgCl -> ZnCl2 + Ag
Zn + 2AgCl -> ZnCl2 + 2Ag
Zn 1 1
Ag 2 2
Cl 2 2
Everything is balanced.
6. 2NaOH + H2SO4 -> Na2SO4 + 2H2O
Na 2 0 2 0
O 2 4 4 2
H 2 2 4
S 1 1
Related Questions
When calcium carbonate is heated, it breaks down into calcium oxide and carbon dioxide. caco3(s) →cao(s) co2(g) you heat 2.0 moles caco3. how many moles of carbon dioxide(co2) will you make?
Answers
Moles of carbon dioxide(co2) will you make only 0.0115 mol was produced.
we know the ideal gas equation,
PV = nRT
PV/RT=n
n=(1.04 atm)(1.00 L) /L atm (0.0821 )(1100 K) mol K
n=0.0115 moles of CO2.
The moles ofCaCO3 = 50.0 g/100.09 g/mol = 0.500 mol CaCO3 .If the reaction had gone to completion, 0.500 mol of CO2 would have been produced. The two different experiments (one with 50.0 g of CaCO3 and one with 100.0 g of CaCO3) reached the same constant, final pressure of 1.04 atm.
Since increasing the amount of reactant did not produce more product, there is no way that all of the CaCO3 reacted. Instead, an equilibrium condition has been achieved and there must be some solid CaCO3 in the container.
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if you are working with a chemical and need to find out about the routes of exposure, as well as the short and long term effects of exposure, where on the sds would you look?
Answers
If you need to learn more about the exposure pathways, as well as the immediate and long-term impacts of exposure, when dealing with a chemical, Toxicological Information Section 11
What are the consequences of toxicity?Additionally possible symptoms include mortality, cyanosis, a headache, weakness, dizziness, shortness of breath, and cyanosis. Ingestion can irritate the digestive system and trigger nausea and vomiting. According to reports, DAAB can cause methemoglobinemia after being inhaled, ingested, or absorbed via the skin.
Toxicology: What is it?A branch of research known as toxicology aids in our understanding of the potentially hazardous consequences that certain materials, settings, and events may have on humans, animals, and the environment.
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What volume of 0.0887 M MgF2 solution is needed to make 275 mL of 0.0224 M MgF2 solution by dilution? a. 69.4 mL b. 72.3 mL c. 14.4 mL d. 91.8 mL
Answers
By dilution, 275 mL or 0.0224 MgF2 solution can be created from 69.4 mL of 0.0887 MgF2 solution.
What exactly does "dilution" mean?By adding extra more solvent, such as water, to the solution, dilution is indeed the process of "reducing the concentration of the solute in a solution." A solution is diluted by adding additional solvent without also adding more solute.
What various dilutions are there?An approach used frequently to achieve this concentration reduction is serial dilution. diluted homeopathy. An equation called "dilution" can be used to determine how quickly a gas diluted. A sort of unauthorized trademark usage outside the relevant market is trademark dilution.
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imagine you are working in a lab and a crystal of benzoic acid touches bare skin on your wrist. why would the advice cited above not be applicable in this situation and what would be a more appropriate response?
Answers
The advice cited above would not be applicable in this situation because benzoic acid is not a corrosive material.
What is material?Material is any object or substance that is used to create something else. It is a physical substance that can be manipulated and transformed in some way to make it useful. Materials can be natural, such as wood, stone, and metal, or they can be synthetic, such as plastic, fabric, or rubber. Depending on the purpose, materials can range from strong and durable to soft and flexible. In the construction industry, materials are chosen for their strength, durability, and cost-effectiveness. In manufacturing, materials are chosen for their ability to be formed and shaped into the desired product. In the arts, materials are chosen for their aesthetic properties and potential to create something unique and visually stimulating.
A more appropriate response would be to thoroughly wash the affected area with soap and water and seek medical attention if irritation or pain persists.
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a chemistry student needs of tetrahydrofuran for an experiment. by consulting the crc handbook of chemistry and physics, the student discovers that the density of tetrahydrofuran is . calculate the volume of tetrahydrofuran the student should pour out. be sure your answer has the correct number of significant digits.
Answers
The density of tetrahydrofuran needed for a chemistry student to do the experiment is 0.888 g/mL
Is water less dense than tetrahydrofuran?Tetrahydrofuran has an ethereal smell and is visible as a transparent, colourless liquid. not as dense as water. 6 °F flash point Air is lighter than vapours.
The finest solvent is tetrahydrofuran, why?Because it can dissolve different resins even at room temperature and is miscible with water and the majority of organic solvents, THF is frequently employed as a solvent for specialised resins such photosensitive resins. Additionally, it serves as a solvent for Wittig and Grignard processes.
Tetrahydrofuran and water: do they mix?Regardless of the sequence of introduction, if two compounds are totally soluble in one another, they are said to be miscible. Tetrahydrofuran (THF), for instance, and water mix well.
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For which one of the following reactions will delta H be approximately (or exactly) equal to delta E?H2(g) + Br2(g) ---> 2HBr(g)H2O(l) ---> H2O(g)CaCO3(s) ---> CaO(s) + CO2(g)2H(g) + O(g) ---> H2O(l)CH4(g) + 2O2(g) ---> CO2(g) + 2H2O(l)
Answers
The reaction for which delta H will be approximately (or exactly) equal to delta E is CH4(g) + 2O2(g) ---> CO2(g) + 2H2O(l).
What is reaction?Reaction is the process of responding to a stimulus or event. It can refer to a physical response, such as a reflex, or an emotional response, such as a feeling. Reactions can be conscious or unconscious, automatic or deliberate, and can occur in any living organism. In psychology, reactions are studied to understand how they shape behavior and to identify underlying mental processes. Reaction time, or the time it takes to respond to a stimulus, can also be measured and studied.
This is because this reaction is an exothermic reaction, which means that the energy released by the reaction is equal to the enthalpy change of the reaction.
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for many years drinking water has been cooled in hot climates by evaporating it from the surfaces of canvas bags or porous clay pots. how many grams of water can be cooled from 35 to 20 degree c by the evaporation of 60 g of water (the heat of vaporization of water in this temperature range is 2.4 kj/g. the specific hear of water is 4.18 j/g-k.)
Answers
The mass in the grams of water can be cooled from 35 to 20 degree c by the evaporation of 60 g of water is the 2296.6 g.
Given that :
ΔH = heat of vaporization = 2.4 kJ/g = 2400 J/g
Mass of the water = 60 g
q = ΔH m
q = 2400 × 60
q = 144000 J
The heat expression is given as :
q = mc ΔT
q = 144000 J
m = ?
c = 4.18 J/ g k
ΔT = 308 K - 293 K = 15 K
m = q / c ΔT
m = 144000 / 4.18 × 15
m = 2296.6 g
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Answer: 127.46 g
Explanation:
ΔH = heat of vaporization = 2.4 kJ/mol = 2400 J/mol
Mass of water = 60 g
Moles of water = 60 g/18 g/mol = 3.33 moles
q = ΔH × moles
q = 2.4 kJ/g × 3.33 mol
q = 2400 J × 3.33 mol
q = 7992 J
The heat expression is given as :
q = 7992 J
m = ?
c = 4.18 J/g × k
ΔT = 308 K - 293 K = 15 K
q = mcΔT
m = q/cΔT
m = 7992/4.18 × 15
m = 127.46 g
Which equation is the balanced chemical equation for the synthesis reaction for the formation of sulfur dioxide (SO₂)?
A.) 2S+0₂ → SO₂
B.) S+20₂4S02
C.) S+0₂2SO2
D.) S+O₂ → SO₂
Answers
The equation that is balanced for the synthesis reaction for the formation of sulfur dioxide (SO₂) is as follows: S + O₂ → SO₂ (option D).
What is synthesis reaction?A chemical reaction is a process typically involving the breaking or making of interatomic bonds, in which one or more substances are changed into others.
A synthesis or combination reaction is a specific type of chemical reaction that involve two or more chemical species combining to form a more complex product:
A + B → AB
According to this question, sulfur combines with oxygen in a synthesis reaction to form sulfur dioxide as follows: S + O₂ → SO₂.
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A sample of silica gel (SiO₂) contains 7.52 x 10^22
molecules of SiO2. How many moles of SiO2
molecules does this sample contain?
Answers
The number of moles in 7.52 × 10²² molecules of silicon dioxide is 0.125 moles.
How to calculate number of molecules?The number of moles in a substance can be calculated by dividing the number of molecules by Avogadro's number as follows:
no of moles = no of molecules ÷ 6.02 × 10²³
According to this question, a sample of silica gel (SiO₂) contains 7.52 x 10²² molecules of silica. The number of moles can be calculated as follows:
no of moles = 7.52 × 10²² ÷ 6.02 × 10²³
no of moles = 1.249 × 10-¹
no of moles = 0.125moles
Therefore, 0.125 moles are present in 7.52 × 10²² molecules of silica.
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Match each element with the charge it will have when it becomes an ion. aluminum rubidium selenium nitrogen neon chlorine barium
Answers
According to electronic configuration, when elements become ion, aluminum, rubidium ,selenium, nitrogen, neon, chlorine, barium loose 3 electrons,1 electron, gain 2 electrons , gain 3 electrons,neon is stable, chlorine gains 1 electron and barium looses 2 electrons.
What is electronic configuration?Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
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how do i solve this with showing all work
Answers
0.750 tsp of baking soda in grams would be 4.49 grams.
Dimensional analysisFrom the available information:
1 tsp of baking soda = 0.211 oz1 oz = 28.35 gramsIf, 1 tsp of baking soda = 0.211 oz, then 0.750 tsp of baking soda would be:
0.750 x 0.211 = 0.15825 oz
Thus, 0.750 tsp of baking soda is equivalent to 0.15825 oz of baking soda.
If 1 oz = 28.35 grams, then 0.15825 oz of baking soda will be:
28.35 x 0.15825 = 4.49 grams
In other words, 0.750 tsp of baking soda would be worth 4.49 grams of baking soda going by the available conversion factors.
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why are uranium-238, uranium-235 and potassium-40 isotopes better than carbon-14 to find the age of artifacts from millions of years ago?
Answers
Uranium-238, Uranium-235, and Potassium-40 isotopes are better than Carbon-14 to find the age of artifacts from millions of years ago because they have longer half-lives.
The half-life of Carbon-14 is only about 5,730 years, making it useful for dating materials that are only up to around 60,000 years old. In contrast, the half-life of Uranium-238 is about 4.5 billion years, and the half-life of Uranium-235 is about 704 million years, making them useful for dating materials that are much older. Potassium-40 has a half-life of 1.25 billion years. This means that these isotopes are still present in much older samples, and can be used to accurately determine the age of materials from millions of years ago.
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Try Again Your answer is incorrect. • Compound COCO3. Your answer is incorrect. • Compound NiSO4: Your answer is correct. It is traditional to write the number part of the charge first in an ion symbol. • Compound CrS: Your answer is correct. It is traditional to write the number part of the charge first in an ion symbol. • Compound VBrz: Your answer is correct. It is traditional to write the number part of the charge first in an ion symbol. Complete the table below by writing the symbols for the cation and anion that make up each ionic compound. The first row has been completed for you. ionic compound cation anion Naci Na Cl-CoCO3 CO+2 CO2-3NiSO4 Ni+2 SO2-4Crs2 Cr-4 S2-V Br3 V+3 Br-
Answers
NiSO4: The answer you gave is accurate. In an ion symbol, the number component of the charge is often written first. • CrS compound.
CoCO3: Is it a salt?It is a salt made up of the weak acid H2CO3 and the strong base Ca(OH). Chalk, or CaCO3, does not function like a base since it does not dissolve in water. Use the app to access an endless number of solutions.
Is coco3 soluble in water?Spherocobaltite, sometimes referred to as cobalt carbonate, is a mineral with the chemical formula CoCO3. It is cobalt's carbonate salt. When melted, it produces red trigonal flakes with a specific gravity of 4.13 that disintegrate. Cold or warm water does not dissolve cobalt carbonate, but acids can.
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if the volume of the reaction vessel in the previous part was 1.50 ll , what amount of br2br2 (in moles) was formed during the first 15.0 ss of the reaction?
Answers
The 15s of the reaction saw 0.0153 moles of Br2 being produced.
Relational Equation
H2 + Br2 > 2HBr
According to the reaction's equation, [HBr] = [H2] + [Br2] = -1/2 [HBr]/[t]
The amount of HBr decreased from 0.520M to 0.486M in the initial 25 seconds of the reaction.
Average Rate of Reaction Rate =-1/2 ([HBr]f- [HBr]t/i
Rate = -1/2 (0.486-0.52/2)
Rate: 0.00068 M/s
0.00068M/s is the reaction's average rate.
Rate of the response is
Rate= [Br2]/t 0.00068= [Br2]/15 Br2= 0.00068 15= 0.0102M
In the reaction, Br2 is present in 0.0102M concentration.
Number of Moles The amount of Br2 produced in the first 15 seconds can be determined using the formula: Number of moles=molarity×volume, where n = 0.0102 and 15 = 0.0153 mol.
0.0153 moles of Br2 were created in the reaction, according to the calculations above.
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Calculate the molar mass of Fe 3(PO 4) 2. 237.64 g/mol 262.52 g/mol 245.79 g/mol 357.49 g/mol 525.04 g/mol
Answers
The molar mass of Fe3(PO4)2 can be calculated by adding the molar masses of each individual element in the compound.
Fe3(PO4)2 is made up of:
3 atoms of Fe (molar mass of Fe = 55.845 g/mol)
2 atoms of P (molar mass of P = 30.973762 g/mol)
8 atoms of O (molar mass of O = 15.9994 g/mol)
To calculate the molar mass of Fe3(PO4)2, we add up the molar masses of each element:
Molar mass of Fe3(PO4)2 = 3(55.845 g/mol) + 2(30.973762 g/mol) + 8(15.9994 g/mol)
= 167.535 g/mol
So the molar mass of Fe3(PO4)2 is 167.535 g/mol
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According to Einstein's equation, if 1 kg of mass "disappears" during a
reaction, then———-
A. the law of conservation of momentum is also violated.
OB. the law of conservation of charge is also violated.
C. the law of conservation of mass is violated.
OD. 3 x 108 J of energy is produced.
Answers
Because you can’t create/destroy energy it just doesn’t disappear. It changes from one form to another form of energy.
Rank the following in order of increasing polarity: CH2Br2, CF2Cl2, CF2Br2, CBr4 A. CH2Br2 < CF2Br2 < CF2Cl2 < CBr4 B. CBr4 < CH2Br2 < CF2Cl2 < CF2Br2 C. CH2Br2 < CF2C12 < CF2Br2 < CBr4 D. CBr4 < CF2Br2 < CF2Cl2 < CH2Br2 E. CBr4 < CH2Br2 < CF2Br2 < CF2Cl2
Answers
CBr4 < CH2Br2 < CF2Br2 < CF2Cl2 Polar molecules contain polar bonds and can be ordered from most to least polar based on the polarity of their bonds.
What is polar bonds?Polar bonds are chemical bonds between atoms in which the sharing of electrons is not equal. Polar bonds are caused by the difference in electronegativity between the two atoms involved in the bond. Electronegativity is the measure of an atom's ability to attract electrons to itself.
CBr4 has the most polar bond and is therefore the most polar molecule. CH2Br2 has the second most polar bond, followed by CF2Br2, and then CF2Cl2 with the least polar bond.
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Write equations showing how each of the following weak bases ionizes water to form OH?.
CO2?3
Express your answer as a chemical equation. Identify all of the phases in your answer.
C6H5NH2
Express your answer as a chemical equation. Identify all of the phases in your answer.
C2H5NH2
Express your answer as a chemical equation. Identify all of the phases in your answer.
Answers
The following species produce OH- in water using the following reaction equation:
CO3^2-(aq) + H2O(l) -------> HCO2^-(aq) + OH^-(aq)
C6H5NH2(aq) + H2O(l) -------> C6H5NH3^+(aq) + OH^-(aq)
C2H5NH2(aq) + H2O(l) -------> C2H5NH3^+(aq) + OH^-(aq)
What is weak base?Bases produce OH- when they react with water. A weak base is a substance that ionizes only to a small extent in water. A weak base remains largely undissociated in water. Recall that bases produce OH- in solution.
Here,
The equation of the reaction by which the following species produce OH- in water are shown below;
CO3^2-(aq) + H2O(l) -------> HCO2^-(aq) + OH^-(aq)
C6H5NH2(aq) + H2O(l) -------> C6H5NH3^+(aq) + OH^-(aq)
C2H5NH2(aq) + H2O(l) -------> C2H5NH3^+(aq) + OH^-(aq)
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the remaining mass of 28 grams of a radioactive element whose half life is 20 years is given by the following equation, after t years. how much of the initial mass remains after 100 years?
Answers
The remaining mass of 28 grams of a radioactive element whose half life is 20 year. The initial mass remains after 100 years is 0.875 grams
The radioactive substance weighs 28 grams at first. The radioactive element has a half-life of 20 years. After t years, the mass y(in grams) that is left is calculated using the equation below
y=28(1/2)^t/20 ,t ≥ 0
Consequently, the quantity of initial mass that is still present after 100 years would be
y=28(1/2)^t/20 ,t ≥ 0
y=28(1/2)^100/20
y=28(1/2)⁵
y = 0.875 grams of the initial mass remain
Therefore, after 100 years, there will still be 22.0.875 grams of the starting mass.
Your question is incomplete but most probably your full question attached below
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Which of the following pairs of elements would be most likely to form an ionic compound AP and BR B Zn and KCC and OD Al and RB?
Answers
Cl and K. the following pairs of elements would be most likely to form an ionic compound AP and BR B Zn and KCC and OD Al and RB A chemical element is a type of atom.
with a certain number of protons in its nucleus, including the pure material made up entirely of that species. [1] Chemical elements, unlike chemical compounds, cannot be broken down into simpler substances by any chemical process. The number of protons in the nucleus is an element's distinguishing attribute, and it is symbolized by the symbol Z - all atoms with the same atomic number are atoms of the same element. [1] Almost all of the universe's baryonic stuff is made up of chemical elements (among rare exceptions are neutron stars).Cl and K. the following pairs of elements ould be most likely to form an ionic compound AP and BR B Zn and KCC and OD Al and RB A chemical element is a type of atom.
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a compound containing 5.9265% hydrogen and 94.0735% oxygen has a molar mas of 34.01468g/mol. determine the emperical and molecular formula of this compound
Answers
A substance with a molar mass of 34.01468g/mol and an empirical formula of Hydrogen and oxygen and a molecular formula of twice has a composition of 5.9265% hydrogen and 94.0735% oxygen.
Thus Molecules are described by the empirical formula, where n = 1, 2, and 3. You can use the empirical formula to ascertain the molecular formula if you are aware of the molar mass of the chemical. Calculate the empirical formula mass first, and then divide the compound molar mass by it to get the empirical formula mass. Compounds are chemical entities comprised of a large number of comparable molecules.
Empirical equation equals Molecular formula
Hydrogen = 5.9265/atm weight: 5.9265/5.8795 = 1 (approximately)
Oxygen = 94.0735/16: 5.8795/5.8795 = 1
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ozonolysis of molecule a would result in the formation of what two functional groups? a ketone and an aldehyde two carboxylic acids two aldeydes two ketones
Answers
Which two functional groups would be created by the ozonolysis of molecule a Me2C = CHMe produces aldehydes and ketones during ozonolysis, providing all the other alternatives no aldehydes.
What does ozonolysis entail as a reaction?To cleave those unsaturated bonds in alkenes, alkynes, etc azo compounds, ozone is used in the organic chemical process known as ozonolysis.
Ozonelysis example: What is it?Pentane will occur from the reaction, for instance, between bromoethane and I-bromopropane. When each of the participants in the reaction reacts on their own, butane will also be produced. For instance, 1-bromopropane produces hexane, while bromoethane produces butane.
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For cis-1,3-dimethylcyclohexane, which structures represent the possible boat conformations?- a- b- c- d
Answers
The structures in option A and D correctly represents structure of cis-1,3-dimethyl cyclohexane.
How does cyclohexane confirmation take place?There are three stable conformations of cyclohexane. Chair, boat, and twist boat are them. The chair conformation is the most stable of the three. Each carbon atom in the cyclohexane's boat shape has two different sorts of groups. Both axial and equatorial groups describe them. From the provided boat conformations, we should determine the cis conformations.
Two substituents are in up, up (or) down, down to each other in boat conformation if they are cis to one another. Two substituents are in up, down, or down, up to each other in boat conformation if they are trans to one another.
In boat conformation A, both methyl groups are in up direction.
In boat conformation-B and C, one methyl group is in up direction and other one is in down direction.
In boat conformation D, both methyl groups are in down direction.
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The complete question is as follows :
For cis-1,3-dimethylcyclohexane, which structures represent the possible boat conformations?- a- b- c- d:
Calculate the energy required to heat 712.0 g of graphite from 2.0 °C to 20.7 °C. Assume the specific heat capacity of graphite under these conditions is 0.710 J-g-K Round your answer to 3 significant digits.
Answers
To calculate the energy required to heat a substance, we can use the formula:
Q = mcΔT
where Q is the heat energy, m is the mass of the substance, c is the specific heat capacity, and ΔT is the change in temperature.
Given that we have 712.0 g of graphite, a specific heat capacity of 0.710 J/g-K, and a temperature change of 18.7 °C (20.7 °C - 2.0 °C)
Q = (712.0 g) x (0.710 J/g-K) x (18.7 °C)
Q = 10,965.64 J.
The energy required to heat 712.0 g of graphite from 2.0 °C to 20.7 °C is 10.965 kJ.
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d. Calculate the concentration of C5H6 when 250 seconds have passed.
e. On the plot of [C5H6] ^ - 1 vs. time, draw a line that shows the results that would be expected if the same experiment was repeated at a lower temperature.
Answers
The concentration of C₅H₆ when 250 seconds have passed is 0.015 M. e. The slope of the plot will be less steep at a lower temperature.
What is concentration or molar mass?The molar mass of many compounds can be calculated by dividing the mass of the compound by the number of moles of the compound.
d.
[C5H6]0⁻¹ = 25 M⁻¹
t = 250 s
k = 0.17 M⁻¹ s⁻¹
Now, substituting these values in the integrated rate law to get,
[C5H6]⁻¹ = 0.17 M⁻¹ s⁻¹ x 250 s + 25 M⁻¹
= 67 M⁻¹
or,
[C5H6] = 1/67 M⁻¹
= 0.015 M
e.
According to the Arrhenius equation, the rate constant of a reaction decreases with temperature.
Therefore, d. the concentration of C₅H₆ is 0.015 M.
e. At lower temperatures, the slope of the plot will be less steep.
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The question is incomplete. Your most probably complete question is given below:
The full question and the graph are added.
Indicate the molecular geometry around the central atom of each of the following species:
CF4 ___
NCIy ___
SOz ___
the silicon atom in disilane (Si is bonded to Si) SizH6 ___
the carbon atom inurea (NHzJzCO (C is bonded to 0,Nand N) ___
Answers
The molecular geometry around the central atom of each of the following species: For CF₄ is tetrahedral, for NCl₃ is trigonal pyramid, for SO₂ is bent, Si₂H₆ is tetrahedral, and for (NH₂)₂CO is trigonal planar.
The definition of molecular geometryThe three-dimensional arrangement of atoms in a molecule is known as molecular geometry, also referred to as the molecular structure. Understanding a compound's molecular structure can be useful in identifying its polarity, reactivity, phase of matter, color, magnetism, and biological activity.
A molecule's three-dimensional shape in space is known as its molecular geometry. The surrounding atoms and electron pairs as well as the central atom influence it. Using the Valence Shell Electron Pair Repulsion (VSEPR) method, the shape of the majority of molecules can be predicted.
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If Ka is 1.85x10^-5 for acetic acid, calculate the pH at one half the equivalence point and at the equivalence point for a titration of 50mL of 0.100M acetic acid with 0.100M NaOH.
Answers
The pH at one half the equivalence point and at the equivalence point for a titration 8.716.
What does titration mean in terms of chemistry?Titration is a method of chemical analysis where the quantity of a sample's constituents is determined by adding a precisely measured amount of a different substance to which the desired constituent will react in a specific, known proportion.
What is titration, and what does it do?The equivalence point, or the point at which chemically equivalent amounts of the reactants have been combined, is to be detected by the titration. The stoichiometry of the reaction determines how many reactants have been combined at the equivalence point.
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Explain why equilibrium constants are dimensionless?
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Answer:
equilibrium expressions do not have units because the concentration or pressure terms that go into them are really ratios having the forms (n mol L–1)/(1 mol L–1) or (n atm)/(1 atm) in which the unit quantity in the denominator refers to the standard state of the substance
Explanation:
Select the ΔH values associated with the dissolution of lithium chloride that are exothermic.
Check all that apply.
ΔH1: energy associated with the separation of water molecules
ΔH2: energy associated with the separation of LiCl ions
ΔH3: energy associated with the formation of water-ion interactions
ΔHsoln: the enthalpy of solution
Answers
The correct statement that are exothermic is energy associated with the formation of water-ion interaction.
An exothermic reaction is the one during which system releases energy and during an endothermic reaction system absorbs energy.
Option 1 is incorrect as water molecules do not undergo ionization when added to water and thus no energy is released.
Option 2 is incorrect because the separation LiCl into subsequent ions requires a significant amount of energy and thus it will be a endothermic reaction.
Option 3 is correct as the formation of water ion releases a large amount of energy and thus it is an endothermic reaction.
Option 4 is also correct as it is the energy associated with the whole system.
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what is the net ionic equation for the precipitation reaction between silver nitrate solution and sodium sulfide solution
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2Ag[+](aq) + S[2-] -> Ag{2}S(s) is the net ionic equation for the precipitation reaction between silver nitrate solution and sodium sulfide solution.
What is ionic equation?An ionic equation is a chemical equation in which the electrolytes in aqueous solution are expressed as dissociated ions. It is similar to a molecular equation in which compounds are expressed as molecules. Chemical equations known as ionic equations only display the ions involved in a chemical reaction. Or, the ions that combine in a solution to react and create new substances. Those ions that don't take part are referred to as spectator ions. A chemical equation known as an ionic equation expresses the electrolytes in aqueous solution as dissociated ions. The ionic species are usually followed by (aq) in the equation to denote that they are in an aqueous solution, and this is typically a salt that has been dissolved in water.
Here,
The precipitation reaction between silver nitrate solution and sodium sulfide solution is represented by the net ionic equation 2Ag[+](aq) + S[2-] -> Ag{2}S(s).
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