Answers
The reaction that is chemically balanced and shows complete combustion is [tex]C_3 H_8 + 5 O_2 -- > 3 CO_2 + 4 H_2 O[/tex], Option B.
What is a balanced equation?A balanced equation is an equation that obeys the law of conservation of atoms.
According to this law, atoms cannot be created and cannot be destroyed during the course of chemical reactions. The atoms can, however, be converted into different forms.
Thus, a balanced equation must have an equal number of participating atoms on both the reactant and product sides of the equation.
Also, a complete combustion reaction must produce carbon dioxide and water. Not carbon monoxide.
Therefore, the equation that fulfills the two conditions is[tex]C_3 H_8 + 5 O_2 -- > 3 CO_2 + 4 H_2 O[/tex]
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Answer:
C
Explanation:
I got it right
Related Questions
In certain fireworks, potassium nitrate breaks down into potassium oxide, nitrogen, and oxygen. This is an example of a
reaction. The opposite process is a
reaction.
Answers
In certain fireworks, potassium nitrate breaks down into potassium oxide, nitrogen, and oxygen. This is an example of a combustion reaction. The opposite process is a synthesis reaction
fireworks are a class of low explosive devices used for aesthetic and entertainment purposes
Here potassium nitrate is break down into the potassium oxide and nitrogen and oxygen which decomposes is by given burning it is also combustion reaction and the synthesis reaction is opposite to this reaction
2KNO₃ → 2KNO₂ + O₂
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HELP NEEDED ASAP!!!! Which of the following statements about the filament sliding model is FALSE?
A. Actin subunits form the dark A band.
B. The thick filament has an head with an ATP-binding site.
C. The tick filament, or the M-line pulls the thin filament to contract a muscle
D. Actin and myosin are both motor proteins.
Answers
Considering the given statements about the filament sliding model in muscles, the statement that is false is;
Actin subunits form the dark A band; option AWhat are muscle filaments?Muscle filaments or myofilaments are the three protein filaments that make up the myofibrils in muscle cells.
There are three main proteins filaments that make up the myofibrils, and they are:
myosin - this is a contractile protein that makes up the dark A band in muscle fibersactin - this a contractile protein that makes up the light band in muscle fibertitin- this is an elastic proteinLearn more about muscle filaments at: https://brainly.com/question/1370027
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situation
A strip of solid lead metal
is put into a beaker of
0.045M Sn(NO3)2 solution.
A strip of solid tin metal is
put into a beaker of
0.092M Pb(NO3)2 solution.
che
rea
Answers
From the reactivity order, we can see that Tin is more reactive than lead. Hence Tin can replace lead from its salt through the strip of solid lead metal.
What is the reactivity series?A chart listing metals in decreasing order of reactivity is called the metals reactivity series.
A metal generally reacts with other chemicals more forcefully the more reactive it is. The easier it is for positive ions to form when losing electrons (cations).
An empirical, calculated, and structurally analytical progression of a group of metals, grouped in order of their "reactivity" from highest to lowest, is known as a "reactivity series" in chemistry.
The equations can be stated as
Pb(s) + Sn[tex](NO_{3})_2[/tex] (aq) → no reaction
Sn (s) + Pb [tex](NO_{3})_2[/tex] → reaction occurs
The final reaction can be stated as
Sn (s) + Pb [tex](NO_{3})_2[/tex] (aq) → Sn[tex](NO_{3})_2[/tex] (aq) + Pb(s)
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Complete Question
A strip of solid lead metal is put into a beaker of 0.045M Sn(NO3)2 solution.
A strip of solid tin metal is put into a beaker of 0.092M Pb(NO3)2 solution.
Provide the complete chemical reaction for the two statements.
5. How many moles are in a gas at 273 K and 1.4 atm in a container with a volume of 30 L?
Answers
There are 0.0476 moles in a gas at 273 K and 1.4 atm in a container with a volume of 30 L.
Describe moles.
The mole (symbol: mol) is the unit of substance amount used by the International System of Units (SI). The amount of a material determines how many elementary entities of that substance are present in an object or sample.
A mole contains precisely 6.022 14076 × 1023 elementary entities. Depending on the substance, an elementary entity may be an atom, a molecule, an ion, an ion pair, or a subatomic particle like an electron. Ten moles of water, a chemical compound, and ten moles of mercury, a chemical element, both contain exactly one atom for each molecule of water, despite having differing volumes and masses.
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What is the relationship among force, mass, and acceleration? (1 point)
O Force equals mass divided by acceleration.
O Force equals mass times acceleration.
O Force equals mass minus acceleration.
O Force equals mass plus acceleration.
Answers
Apologies if anything is wrong and if you have any questions please ask me.
The relationship among force, mass, and acceleration is force equals mass times acceleration. Therefore, option B is correct.
What is an acceleration ?The term acceleration is defined as the rate of change of velocity. When an object moves in a circular path at a constant speed, it is still accelerating because its velocity direction changes.
The application of a net force to an object alters its motion, the greater the net force, the greater the acceleration. More massive objects necessitate greater net forces to accelerate at the same rate as less massive objects.
“Force equals mass times acceleration.” This is because this shows the equation for force, and thus it shows the relationship between them in how they are used.
Thus, option B is correct.
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A 0.15M solution of methylamine CH3NH2 contains an unknown concentration of methylamine chloride CH3NH3Cl. If the solution has a pH of10.20,what is the concentration of methylamine chloride in the solution? Kb for methylamine =4.6*10^-4f
Answers
The concentration of the methylamine chloride is 0.0000013 M.
What is the concentration of methylamine chloride in the solution?We know that the concentration has to do with the amount of the substance that is present. Hence, the question is essentially trying to ask us to be able to find the the concentration of methylamine chloride in the solution.
[H^+] = Antilog(-0.20) = 0.63 M
Ka = 1 * 10^-14/4.6*10^-4 = 2.22 * 10^-11
Let us first set up the ICE table as shown below;
CH3NH2(aq) + H^+ ⇄ CH3NH3^+(aq) + OH^-(aq)
I 0.15 0.63 0 0
C -x -x +x +x
E 0.15 - x 0.63 -x x x
Ka = [CH3NH3^+] [OH^-]/[CH3NH2] [H^+]
2.22 * 10^-11= x^2/[0.15 - x] [0.63 -x ]
2.22 * 10^-11(0.09 -0.15x - 0.63x + x^2) = x^2
2.22 * 10^-11(0.09 - 0.48x +x^2) = x^2
1.9 * 10^-12 - 1.1 * 10^-11x + 2.22 * 10^-11x^2 = x^2
x^2 - 2.22 * 10^-11x^2 + 1.1 * 10^-11x - 1.9 * 10^-12 = 0
x^2 + 1.1 * 10^-11x - 1.9 * 10^-12 = 0
x =0.0000013 M
Concentration of the methylamine chloride = 0.0000013 M
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Please help
Calcium carbonate can undergo a chemical reaction to produc calcium oxide (CaO) and carbon dioxide (CO₂). Which possible masses of calcium oxide and carbon dioxide can form when 400g of calcium carbonate undergoes this chemical reaction?
*
1 point
400g CaO and 0g CO₂
224g CaO and 176g CO₂
40g CaO and 10g CO₂
The atomic mass of the element neon (Ne) is 20.180 amu. Which measurement is correct?
1 point
1 gram Ne = 20.180 moles = 1.215×1025 atoms
1 gram Ne = 20.180 moles = 6.022×1023 atoms
1 mole Ne = 20.180 grams = 1.215×1025 atoms
1 mole Ne = 20.180 grams = 6.022×1023 atoms
When reactants of a reaction are known, which fact can always be deduced about the products?
*
1 point
the state of the products
the number of atoms in the products
the number of products
the mass of each product
The atomic mass of carbon (C) is 12.01amu and oxygen (O) is 16.00amu. Which molar mass is correct for carbon dioxide (CO₂)?
*
1 point
28.01 g/mol
44.01 g/mol
192.16 g/mol
268.01 g/mol
How many moles is in 43g of CO₂?
*
1 point
1204 mol
1.54 mol
2.59 x 10²⁵
According to the law of conservation of matter, which statement best describes a balanced chemical equation?
1 point
The number of moles of atoms of each element must be the same in the reactants and in the products.
The total number of moles of atoms must be the same in the reactants and in the products.
The total number of molecules must be the same in the reactants and in the products.
The number of moles of each molecule must be the same in the reactants and in the products.
Nitrogen gas combines with hydrogen gas to produce ammonia (N₂+3H₂⟶Ammonia). Based on the law of conservation of mass, which could be the product of the reaction?
*
1 point
NH₂
NH₃
2NH₃
3NH₂
How do you calculate the number of moles from mass?
*
1 point
it is the product of moles and molar mass
it is the quotient of mass and molar mass
it is the product of mass and molar mass
it is the quotient of avogadro's number and molar mass
Sugar reacts with oxygen gas to produce carbon dioxide and water (C₆H₁₂O₆ + 6O₂⟶6CO₂+6H₂O). Which ratio of components is correct?
*
1 point
For every 12 moles of CO₂ produced, 2 moles of C₆H₁₂O₆ is needed.
For each mole of O₂, 1 mole of C₆H₁₂O₆ is needed.
For every 5 moles of water produced, 6 moles of oxygen is needed.
What is the molar mass of NH₄Cl?
*
1 point
53.5 g/mol
50.5 g/mol
497.0 g/mol
Answers
The possible masses of calcium oxide and carbon dioxide that can form when 400g of calcium carbonate undergoes decomposition is
224g CaO and 176g CO₂; option CThe correct measurement of the element neon (Ne):
1 mole Ne = 20.180 grams = 6.022 × 10²³ atomsWhen reactants of a reaction are known, the fact that can always be deduced about the products is:
the number of products; option CThe correct molar mass correct for carbon dioxide (CO₂) is 44.01 g/mol; option B
The number of moles in 43 g of CO₂ is 0,977 moles.
According to the law of conservation of matter, the statement that best describes a balanced chemical equation:
The number of moles of atoms of each element must be the same in the reactants and in the products.
Based on the law of conservation of mass, the product of the reaction of nitrogen gas and hydrogen is 2 NH₃.
To calculate the number of moles from mass, take the quotient of mass and molar mass; option B
The ratio of components in the reaction of sugar with oxygen gas to produce carbon dioxide and water is:
For every 12 moles of CO₂ produced, 2 moles of C₆H₁₂O₆ is needed; option A
The molar mass of NH₄Cl is 53.5 g/mol; option A.
What mass of calcium oxide (CaO) and carbon dioxide (CO₂) are produced when 400 g of Calcium carbonate decomposes?The decomposition of 1 mole of calcium carbonate yields 1 mole of CaO and 1 mole of CO₂ as shown in the equation below:
CaCO₃ ---> CaO + CO₂.
Molar mass of CaCO₃ is 100 g.
400 g of CaCO₃ is equal to 4 moles
4 moles of CaCO₃ produces 4 moles of CaO and CO₂
Mass of 4 moles of CaO = 4 * 56 = 224 g
Mass of 4 moles of CO₂ = 4 * 44 176 g
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Combustion of 1.00 × 102 mg of caffeic acid yields 220 mg of CO2 and 40.3 mg of H2O.
Answers
The empirical formula of the caffeic acid is C₂H₂O.
What is mass composition of each element?The mass composition of the carbon and hydrogen in the carbon dioxide and water respectively is calculated as follows;
mass of carbon dioxide CO₂ = 44 g/molmass of water H₂O = 18 g/molatomic mass of carbon = 12 g/molatomic mass of hydrogen gas = 2 g/moltotal mass of the caffeic acid = 1 x 10² mg = 0.1 gmass of carbon in 220 mg of CO₂ = (12 x 0.22 g)/(44) = 0.06 g
mass of hydrogen in 40.3 mg of H₂O = (2 x 0.0403 g) / (18) = 0.0045 g
mass of oxygen = 0.1 g - (0.06 g + 0.0045 g) = 0.0355 g
The molar composition of the elements is calculated as follows;
H = 0.0045 /1 = 0.0045
C = 0.06 / 12 = 0.005
O = 0.0355 / 16 = 0.0022
Divide through with the smallest molar composition
H = 0.0045 / 0.0022 = 2
C = 0.005/0.0022 = 2
O = 0.0022/0.0022 = 1
The empirical formula is C₂H₂O
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The complete question is below:
Combustion of 1.00 × 102 mg of caffeic acid yields 220 mg of CO2 and 40.3 mg of H2O. find the empirical formula of the caffeic acid.
In order for radiation to transfer heat,
electromagnetic waves must be transmitted
objects must be in direct physical contact
particles must circulate and move in a liquid or gas
thermal energy must move from cold to hot objects
Answers
To transfer heat in radiation electromagnetic waves must be transmitted.
Heat transfer occurs through conduction, convection and radiation.
Conduction requires direct physical contact whereas in convection the particles must circulate and move in a liquid or gas. Both of the transfer heat only in the presence of air.
Radiation is a type of heat transfer that occurs everywhere through electromagnetic waves. In radiation, electromagnetic waves must be transmitted for the transfer of heat. It happens even in vacuum.
Every object radiates thermal energy. Even humans radiate heat at all times. It does not have to move from cold to hot objects.
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An atom of Lithium has three protons. It is neutral so it has no electrical charge.
Which statement is true using ONLY this information?
A There is a charge of +3 on an atom of lithium.
B There are three neutrons in the nucleus.
C There are three electrons
D There is charge -3 on an atom of lithium.
Answers
In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. The correct option is option C
What is atom?Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided.
As it is given that lithium atom is neutral for this number of proton has to be equal to number of electron. The proton number is 3 that means number of electron is also 3 because proton number is equal to number of electron and this equals to atomic number.
Therefore there are three electrons in Lithium if it has three proton. The correct option is option C
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I need help !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answers
There was distilled water in the cuvette when the student put the standard solution in it.
The correct option is A.
What is the use of concentration of solution?The concentration of a solution can be used to determine how much solute has been dissolved in a given quantity of liquid or solution. A concentrated solution is one that has a large concentration of the dissolved solute. If there is only a small amount of dissolved solute in the solution, it is said to be dilute.
Why is it important to understand the concentration of the solutions ?In chemistry, a solution's concentration refers to the proportion of a solute that is present in a given amount of solvent or solution. Understanding the solute concentration is necessary for controlling the stoichiometry of reactants in solution reactions.
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The complete question is -
A student uses visible spectrophotometry to determine the concentration of CoCl₂ (aq) in a sample solution. First the student prepares a set of CoCl₂ ( aq) solutions of known concentration. Then the student uses a spectrophotometer to determine the absorbance of each of the standard solutions at a wavelength of 510nm and constructs a standard curve. Finally, the student determines the absorbance of the sample of unknown concentration.
The student made the standard curve above. Which of the following most likely caused the error in the point the student plotted at 0.050 M Co²⁺(aq)?
A-There was distilled water in the cuvette when the student put the standard solution in it.
B-There were a few drops of the 0.100 M Co²⁺(aq) standard solution in the cuvette when the student put the 0.050 M standard solution in it.
C-The student used a cuvette with a longer path length than the cuvette used for the other standard solutions.
D-The student did not run a blank between the 0.050 M Co²⁺(aq) solution and the one before it.
Which elements can form more than one type of ion?
Answers
What are the top three sources of U.S. electricity generation? Estimate the overall efficiency of U.S. electricity generation. How does this compare to the efficiency for transportation?
Answers
For electricity generation, the three major parts of energy are fossil fuels (coal, natural gas, and petroleum), nuclear energy, and renewable power sources.
How is electricity generated in the United States?According to the US Energy Information Administration, natural gas, nuclear energy, and coal will generate the majority of the country's electricity in 2020. Renewable energy sources such as wind, hydropower, solar power, biomass, wind, and geothermal are also used to generate electricity. In contrast to the use of fossil fuels, renewable electricity generation in the United States has increased in recent years, reaching nearly 800 terawatt hours in 2020. Natural gas, solar, and wind power continue to be the dominant forms of new generation capacity, accounting for 99.74% of all capacity additions in 2021 and 98% of capacity additions in 2022. Solar capacity has increased dramatically, with over 25,000 MW added since 2020, representing a 60% increase.To learn more about U.S. electricity generation, refer to:
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why is oxygen used in the production of raw copper?
Answers
Oxygen is used in the production of raw copper because it is a catalyst for the reaction that turns alumina into pure copper.
Alumina is an ore, and it is a refractory metal. Alumina has three components: aluminum oxide (Al2O3), silica (SiO2), and water. When this ore is heated, the aluminum oxide breaks down into smaller pieces of aluminum and oxygen gas.
When this process happens, these gases react with each other to produce pure oxygen gas. The reaction between the gases also produces heat, which causes more alumina to break down from its original form.
The oxygen produced by this reaction can be used as a catalyst for turning alumina into pure copper at high temperatures.
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When 0.442g of sodium metal is added to an excess of HCl acid, 4590J of heat are produced. What is the enthalpy of the reaction as written:
2Na(s) + 2HCl (aq) yields 2NaCl + H2(g)
What is enthalpy of reaction in KJ.
I tried to work this out but am not sure if I need to multiply my answer by two because of the 2 moles of Na or if that is accounted for already in the grams of sample.
My work as far:
chemical reaction is exothermic, so delta H wil be negative
Q=number of moles x delta H
There are 2 moles of Na in equation producing 2 mol NaCl
Na is 22.989769 g/mol so 0.4429 sample has .4429/22.989769 = 0.019 mol
Delta H is Q/number of moles
-4590J/.019mol = -241,578.9J divided by 1000 is -241.579KJ. (enthalpy)
So I wonder if I need to multiply this by 2 since the chemical equation has two moles
if so, the answer would be -483.158KJ.
IF I'm not using the correct formula to solve, I also need to know that.
Answers
The enthalpy of the reaction is obtained as 242 kJ/mol
What is the enthalpy?We define the term enthalpy as the heat that is evolved or absorbed in a chemical process. In this case, heat is evolved when the reaction occurs because a neutralization reaction is necessarily an exothermic reaction. This is because het is given off.
We have been supplied with the amount of that is produced in the process. Hence we have;
Number of moles of sodium metal = 0.442g /23 g/mol = 0.019 moles
Thus, we have the enthalpy as;
H = 4590 * 10^-3 kJ/0.019 moles
= 242 kJ/mol
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look at the picture
Answers
Each isotopes has a different atomic mass , and each occurs in nature in different abundance this statement is true.
What are Isotopes?Isotopes can be defined as varieties of chemical elements that have the same number of protons and electrons but different numbers of neutrons. In other words, isotopes are varieties of elements that differ in their number of nucleons (the total number of protons and neutrons) due to the difference in the total number of neutrons in their nuclei. The total number of neutrons in the nucleus of an isotope can be determined by subtracting the atomic number of the element from the mass number of the isotope.
For example, the mass number of the isotope 12C of carbon is 12. The atomic number of carbon is 6. Therefore, the isotope carbon-12 has a total number of neutrons of 6.
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need help asap. Just answer the question in the picture
Answers
0.5 pts This is a reaction that you can find the two half reactions for on a REDOX tower in your discussion manual: NAD+ +H2 --> NADH + 2H+
Group of answer choices
Which compound is the electron donor?
Which compound is the electron acceptor?
When the electron donor loses the electron it becomes:
When the electron acceptor accepts the electron it becomes:
Overall the electron travels from:
Answers
The electron donor is [tex]H_2[/tex].
The electron acceptor is [tex]NAD^+[/tex]
When the electron donor loses the electron, it becomes oxidized.
When the electron acceptor accepts the electron, it becomes reduced.
Overall, the electron travels from H to [tex]NAD^+[/tex].
Oxidation and reductionOxidation is defined as:
Loss of electronsIncrease in oxidation numberLoss of hydrogenGain of oxygenReduction is defined as:
Gain of electronsDecrease in oxidation numberGain of hydrogenLoss of oxygenLooking at the reaction, [tex]NAD^+[/tex] gained hydrogen or an electron to become NADH. this means that NADH has been reduced. The reducing agent or the electron donor is [tex]H_2[/tex] .
Thus, the electron acceptor is [tex]NAD^+[/tex]. When the electron donor, [tex]H_2[/tex], loses the electron, it becomes oxidized to [tex]H^+[/tex].
When the electron acceptor, [tex]NAD^+[/tex], accepts the electron, it becomes NADH.
This means that electron travels from [tex]H_2[/tex] to [tex]NAD^+[/tex]
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The electrical charge of the nucleus of an atom is +12. How many electrons does the atom have in its neutral state?
Answers
The electrical charge of the nucleus of an atom is +12 then 12 electrons does the atom have in its neutral state
Basic property of matter carried by some elementary particles that governs how the particles are affected by an electric or magnetic field and when a neutral atom gains or loses electrons, it becomes an ion and heavier atoms tend to have more neutrons than protons, but the number of electrons in an atom is always equal to the number of protons and so an atom as a whole is electrically neutral
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Why doesn’t the brain return back to normal as soon as someone stops taking drugs
Answers
The brain does not return to normal as soon as someone stops taking drugs because brain receptors become overwhelmed. Dopamine synthesis is reduced or dopamine receptors are eliminated in the brain.
Why does this happen?Endorphins, which are natural opioids produced by your body, are used to block pain signals.
Peripheral/nociceptive pain is associated with injuries that harm your skin and muscles, such as pinpricks and stove burns.
Pain fibers detect these wounds and transmit the signal to the neurons in your spine and brain, the two structures that make up your central nervous system.
Your pain fibers and central nervous system normally cooperate in a condition. Your brain says "ow" and instructs your body how to respond when someone punches you. Release of stress-relieving chemicals. Your immune system combats the swelling in your injured arm.
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Convert 528 ft/min to ft/sec.
Answers
One foot equals 60 feet per minute if the conversion factor is 60. The 528ft/min will be 8.8ft/sec.
How many feet per minute does one foot per second equal?One foot equals 60 feet per minute if the is 60.
How quickly does light move per second?To convert speed to miles per hour, multiply the speed in feet per second by 0.681818. You could, for example, convert 5 feet per second to miles per hour using the method shown above. Miles per hour and feet per second are used to measure speed. Continue reading to learn more about each unit of measurement.
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An organic compound contains 24.24%carbon,4.04% hydrogen,and 71.72%chlorine what is its empirical formula if the molecular mass of the coumpound is 148.5 determine its molecular formula
Answers
The empirical formula of an organic compound with 24.24% carbon. 4.04% hydrogen, and 71.71% chlorine will be [tex]CHCl_2[/tex].
If the molar mass of the compound is 148.5, the molecular formula will be [tex]C_2H_2Cl_4[/tex].
Empirical and Molecular FormulasThe compound contains:
C = 24.24H = 4.04Cl = 71.71The mole of each atom can be found by dividing them by their respective molecular weights.
C = 24.24/12 = 2.02H = 4.04/1 = 4.04Cl = 71.71/35.5 = 2.02Now, let's divide through by the smallest number of moles
C = 1H= 2Cl = 1Thus, the empirical formula of the compound is [tex]CHCl_2[/tex].
The molar mass of the empirical formula is calculated as:
12 + 1 + (35.5 x2) = 84 g/mol
Molecular formula = [empirical formula]n
Where n = Molecular formula mass/empirical formula mass
In this case, n = 148.5/84
= 1.77 (approximatel 2)
Thus, the molecular formula of the compound is [tex]C_2H_2Cl_4[/tex].
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Write a balanced chemical equation for each of the following neutralization reactions.
HNO3 + Al(OH)3
Answers
The balanced chemical equation for the neutralization reaction is Al(OH)₃ + 3HNO₃ ----> Al(NO₃)₃ + 3H₂O.
What is the balanced chemical equation neutralization reaction?A balanced chemical reaction is defined as the equation in which the number of atoms in each reaction remains the same on both sides like on the product side and the reactant side. In a balanced chemical equation, the mass, as well as the change, remains the same in a balanced chemical equation.
A neutralization reaction is a reaction in which the acid reacts quantitatively with a base to form salt and as well as water is known as neutralization reaction. In a neutralization reaction, there is a combination of H+ ions and OH– ions that form water.
The balanced chemical equation for the given value of the neutralization reaction is given below.
Al(OH)₃ + 3HNO₃ ----> Al(NO₃)₃ + 3H₂O, the equation is balanced.
So we can conclude that Al(OH)₃ + 3HNO₃ ----> Al(NO₃)₃ + 3H₂O is the balanced reaction.
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Assume you had a solution that contained a mixture of silver ions and strontium ions. Come up with two different reaction plans that would allow you to precipitate either the silver ion or strontium ion, but the other ion would remain in solution.
Answers
Answer:
Explanation:
By creating complex ions, altering the solution's pH, or raising the temperature to redissolve part of the solids, metal ions that precipitate together can be separated using a variety of different methods.
Name one hobby and/or career in which it would be important for people to understand the gas laws. Explain why it is important to that hobby/career.
Answers
One career in which it would be important for people to understand the gas laws is chemist.
Who is a chemist?A chemist is a person who specializes in the science of chemistry, especially at a professional level.
The gas laws are an integral component of chemistry as a subject or course of study. The fundamental gas laws in chemistry are as follows;
Boyle's Law Gay- Lussac Law Avogadro's LawIdeal Gas Law: PV = nRTThese laws explain the interaction of an ideal gas, which is a gas whose molecules exhibit no interaction, and undergo elastic collision with each other and with the walls of the container.
Therefore, being a chemist as a career path means understanding the gas laws.
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Calculate the mass of iron(III) oxide (Fe₂O3) that contains a billion (1.0 × 10^9) oxygen atoms.
Be sure your answer has a unit symbol if necessary, and round it to 2 significant digits.
Answers
The balanced chemical equation for rusting iron is:
4Fe + 3O2 = 2Fe2O3
If we divide 1.0x10^9 by Avogadro's number, we get the amount of moles of oxygen which is 1.6611x10^-15 moles.
From the chemical equation we know that it takes 3 moles of oxygen to produce 2 moles of iron oxide. So if we multiply the moles of oxygen calculated by 2/3, we can get the moles of iron oxide.
(1.611x10^-15)(2/3) = 1.107419x10^-15 moles of iron oxide.
If we multiply the moles of iron oxide by the molar mass of iron oxide, we get how many grams of iron oxide would be produced by 1 billion oxygen atoms. Which is the same thing as how many grams of iron oxide contain 1 billion oxygen atoms.
(1.107419x10^-15)(159.69) = 1.8x10^-13 grams of Fe2O3
2. James throws a rock into a deep well with a velocity of 10.0 m/s [down]. What is the velocity of the rock 2.5 s
Answers
The velocity of the Rock is 34.5 m/s.
What is defined as velocity?The direction of a body or object's movement is defined by its velocity. In its basic form, speed is a scalar quantity. In essence, velocity is a vector quantity. It is the speed at which distance changes. It is the displacement change rate.Velocity is the pace and direction of an object's movement, whereas speed is the time rate at which an object is travelling along a path. In other words, velocity is a vector, whereas speed is a scalar value.The pace at which a body's distance changes in relation to time is referred to as its velocity. Its SI equivalent is m/s.To learn more about : Velocity
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How many grams are there in 7.4 x 1023 formula units of AgNO3?
Answers
Data we are collecting from the equation as:
7.4x10^23 = silver nitrate molecules as given in the question.
As we know Avogadro's no. 6.022*1023 which is a number of molecules.
So when we calculate any no. Of the mole of any atom we know that 1mole of any atom is equal to Avogadro's no and grams can be calculated from the mole's equation.
So back to the point,
Dividing molecules of AgNO3 to no. of molecules per mol of AgNO3
7.4 / 6.02*1023
= 1.229*1023per mole of AgNO3.
OK we get the moles of AgNO3
Now checking the gram of AgNO3
The weight of AgNO3 is 163.868.
Now multiplying both values moles*molar weight of AgNO3
1.229*1023 * 763.868 = 208.767grams of AgNo3
French toast (the breakfast food) would be
an example of a/an
compound
molecule
pure substance
mixture
Answers
French toast (the breakfast food) would be an example of molecule because of chemical change.
What are molecules ?A molecule is the smallest unit of a material that keeps its content and properties. It is composed of two or more atoms that are joined together by chemical bonds. Chemistry is built upon molecules. The element symbol and a subscript indicating the number many atoms are used to identify molecules.
How are molecules created?Atoms interact with each other and with their nuclei when they are close to one another. A molecule is created whenever two or more atoms combine in a way that lowers the state's overall energy.
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At a certain temperature, this reaction establishes an equilibrium with the given equilibrium constant, Kc. 3A(g)+2B(g)↽−−⇀4C(g)c=1.33×1031 3 A ( g ) + 2 B ( g ) ↽ − − ⇀ 4 C ( g ) K c = 1.33 × 10 31 If, at this temperature, 1.80 mol of A and 3.50 mol of B are placed in a 1.00 L container, what are the concentrations of A, B, and C at equilibrium?
Answers
The equilibrium concentrations of A, B, and C at equilibrium are:
the concentration of A = 0.12 Mthe concentration of B = 2.38 Mthe concentration of C = 2.24 MWhat are the equilibrium concentrations of A, B, and C?The equilibrium concentrations of A, B, and C are calculated from the equilibrium equation below as follows:
Kc = [C]⁴ / [A]³ * [B]² -----(1)
Kc = 1.33 * 10
The initial concentrations of A and B are as follows:
A = 1.80 mol / 1 L = 1.8 M
B = 3.50 mol / 1 L = 3.50 M
The concentrations at equilibrium are given by the ICE table below:
3 A (g) + 2 B (g) ⇄ 4 C (g)
I 1.80 3.50 0
C - 3x - 2x + 4x
E 1.80 - 3x 3.50 - 2x 4x
Substituting the concentrations at equilibrium into the equilibrium equation above
1.33 * 10³¹ = 4x⁴ / (1.80 - 3x)³ * (3.50 - 2x)²
x = 0.56
Therefore;
the concentration of A = 1.80 - 3 * 0.56
the concentration of A = 0.12 M
the concentration of B = 3.50 - 2 * 0.56
the concentration of B = 2.38 M
the concentration of C = 4 × 0.56
the concentration of C = 2.24 M
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