Question 1

An average banana contains 0.422 grams of potassium. How many atoms of potassium is this?

Accepted Answer

A)   6.50  1021 atoms
B)   1.07  10-2 atoms
C)   2.54  1023 atoms
D)   92.7 atoms
E)   1.34  1022 atomsF) A) and B)
G) A) and E)

Question 2

All of the statements below about chemical reactions are true except

Accepted Answer

A)   elements in the reactants change into new product elements.
B)   reactants change into products.
C)   total mass remains unchanged.
D)   atoms are neither created nor destroyed.
E)   atoms in reactant molecules change partners to form new molecules.F) A) and E)
G) A) and D)

Question 3

Which coefficient should be placed in front of the H2O when balancing the following equation?
(NH4) 2Cr2O7(s)   Cr2O3(s)  + N2(g)  + H2O(g)

Accepted Answer

A)   1
B)   2
C)   3
D)   4
E)   8F) B) and E)
G) A) and B)

Question 4

Joseph Priestley's discovery of oxygen involved the unbalanced chemical reaction provided here. What mass of mercury would be produced from the decomposition of 12.3 g of HgO?
HgO  Hg + O2

Accepted Answer

A)   12.3 g
B)   11.4 g
C)   5.70 g
D)   22.8 g
E)   201 gF) B) and E)
G) A) and B) B

Question 5

Solid aluminium reacts with oxygen gas to form solid aluminium oxide (Al2O3). Write the full, balanced chemical equation for this process.

Accepted Answer

4 Al₍_s₎ + 3 O...

Question 6

The numerical ratios of reactants and products in a chemical reaction is called

Accepted Answer

A)   stoicism.
B)   stoichiometry.
C)   fractional coefficients.
D)   proportionality.
E)   chemical formula.F) A) and B)
G) A) and C)

Question 7

A silver earring weighs 16.3 g. How many atoms of silver are contained in the earring?

Accepted Answer

A)   0.151 atoms
B)   7 atoms
C)   9.81  1024 atoms
D)   9.09  1022 atoms
E)   3.99  1024 atoms F) B) and D)
G) D) and E)

Question 8

Atoms are neither created nor destroyed during chemical reactions. This is because all chemical reactions obey the law of

Accepted Answer

A)   increasing entropy.
B)   atomic energy.
C)   multiple proportions.
D)   conservation of energy.
E)   conservation of mass.F) A) and B)
G) D) and E)

Question 9

Ammonia reacts with oxygen to produce nitric acid and water, according to the unbalanced equation provided here. How much oxygen (in g)  would be required to produce 445 g nitric acid?
NH3 + O2  HNO3 + H2O

Accepted Answer

A)   28 500 g
B)   904 g
C)   452 g
D)   226 g
E)   14.1 gF) A) and B)
G) A) and C)

Question 10

The capacity to do work is known as

Accepted Answer

A)   energy.
B)   power.
C)   potential.
D)   thermicity.
E)   velocity.F) D) and E)
G) C) and E) A

Question 11

Choose the true statement.

Accepted Answer

A)   Formation of covalent bonds absorbs energy.
B)   Single bonds have lower bond energy than double bonds.
C)   Breaking bonds is an exothermic process.
D)   The units of bond energy are N/kg.
E)   The higher the bond energy is, the easier it is to break.F) A) and B)
G) B) and D)

Question 12

Pictured here is the periodic table bock for the element sulfur. How much does one mole of sulfur atoms weigh?
 1023 g" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   32.065 amu
B)   32.065 g
C)   16 amu
D)   16 g
E)   6.022  1023 gF) A) and B)
G) A) and D)

Question 13

What is the combining ratio of ethanol to oxygen when they react to form the products carbon monoxide and water?

Accepted Answer

The answer of What is the combining ratio of ethanol...

Question 14

Calculate the molar mass of phosphoric acid, H3PO4.

Accepted Answer

A)   48.0 g/mol
B)   98.0 g/mol
C)   50.0 g/mol
D)   96.0 g/molE) A) and C)
F) A) and D)

Question 15

"Anaerobic" means without

Accepted Answer

A)   life.
B)   exercise.
C)   carbon.
D)   air.
E)   energy.F) C) and E)
G) A) and B)

Question 16

Joseph Priestley's discovery of oxygen involved the unbalanced chemical reaction provided here. What mass of oxygen would be produced from the decomposition of 12.3 g of HgO?
HgO  Hg + O2

Accepted Answer

A)   1.82 g
B)   0.909 g
C)   3.63 g
D)   0.455 g
E)   0.981 gF) B) and E)
G) D) and E)

Question 17

Pictured here is the periodic table block for the element aluminium. How much does one atom of aluminium weigh?

Accepted Answer

A)   13 g
B)   13 amu
C)   26.982 g
D)   26.982 amu
E)   Not enough information is given.F) A) and E)
G) D) and E)

Question 18

What is the meaning of the letter "s" in the following chemical equation?
C(s)  + O2(g)   CO2(g)

Accepted Answer

A)   single
B)   sigma
C)   solid
D)   soft
E)   stoichiometryF) D) and E)
G) C) and D) C

Question 19

A balloon contains 0.015 moles of helium. What mass of helium does the balloon contain?

Accepted Answer

A)   270 g
B)   0.0034 g
C)   0.060 g
D)   4.0 g
E)   9.03  1021 gF) B) and E)
G) D) and E)

Question 20

How many molecules are contained in 0.650 g acetaminophen (C8H9NO2) ?

Accepted Answer

A)   3.91  1023 molecules
B)   4.30  10-3 molecules
C)   2.59  1021 molecules
D)   9.26  1023 molecules
E)   5.92  1025 moleculesF) D) and E)
G) A) and C)

Exam 6: Chemical Reactions

An average banana contains 0.422 grams of potassium. How many atoms of potassium is this?

Correct AnswerverifiedShow Answer

All of the statements below about chemical reactions are true except

Correct AnswerverifiedShow Answer

Which coefficient should be placed in front of the H2O when balancing the following equation? (NH4) 2Cr2O7(s)  Cr2O3(s) + N2(g) + H2O(g)

Correct AnswerverifiedShow Answer

Joseph Priestley's discovery of oxygen involved the unbalanced chemical reaction provided here. What mass of mercury would be produced from the decomposition of 12.3 g of HgO? HgO  Hg + O2

Correct AnswerverifiedB

Solid aluminium reacts with oxygen gas to form solid aluminium oxide (Al2O3). Write the full, balanced chemical equation for this process.

Correct Answerverified4 Al(s) + 3 O...View AnswerShow Answer

The numerical ratios of reactants and products in a chemical reaction is called

Correct AnswerverifiedShow Answer

A silver earring weighs 16.3 g. How many atoms of silver are contained in the earring?

Correct AnswerverifiedShow Answer

Atoms are neither created nor destroyed during chemical reactions. This is because all chemical reactions obey the law of

Correct AnswerverifiedShow Answer

Ammonia reacts with oxygen to produce nitric acid and water, according to the unbalanced equation provided here. How much oxygen (in g) would be required to produce 445 g nitric acid? NH3 + O2  HNO3 + H2O

Correct AnswerverifiedShow Answer

The capacity to do work is known as

Correct AnswerverifiedA

Choose the true statement.

Correct AnswerverifiedShow Answer

Pictured here is the periodic table bock for the element sulfur. How much does one mole of sulfur atoms weigh?

Correct AnswerverifiedShow Answer

What is the combining ratio of ethanol to oxygen when they react to form the products carbon monoxide and water?

Correct AnswerverifiedShow Answer

Calculate the molar mass of phosphoric acid, H3PO4.

Correct AnswerverifiedShow Answer

"Anaerobic" means without

Correct AnswerverifiedShow Answer

Joseph Priestley's discovery of oxygen involved the unbalanced chemical reaction provided here. What mass of oxygen would be produced from the decomposition of 12.3 g of HgO? HgO  Hg + O2

Correct AnswerverifiedShow Answer

Pictured here is the periodic table block for the element aluminium. How much does one atom of aluminium weigh?

Correct AnswerverifiedShow Answer

What is the meaning of the letter "s" in the following chemical equation? C(s) + O2(g)  CO2(g)

Correct AnswerverifiedC

A balloon contains 0.015 moles of helium. What mass of helium does the balloon contain?

Correct AnswerverifiedShow Answer

How many molecules are contained in 0.650 g acetaminophen (C8H9NO2) ?

Correct AnswerverifiedShow Answer

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Which coefficient should be placed in front of the H₂O when balancing the following equation? (NH₄) ₂Cr₂O₇₍_s₎  Cr₂O₃₍_s₎+ N₂₍_g₎+ H₂O₍_g₎

Correct Answer
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Joseph Priestley's discovery of oxygen involved the unbalanced chemical reaction provided here. What mass of mercury would be produced from the decomposition of 12.3 g of HgO? HgO  Hg + O₂

Correct Answer
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B

Solid aluminium reacts with oxygen gas to form solid aluminium oxide (Al₂O₃). Write the full, balanced chemical equation for this process.

Correct Answer
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4 Al₍_s₎ + 3 O...
View Answer

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Ammonia reacts with oxygen to produce nitric acid and water, according to the unbalanced equation provided here. How much oxygen (in g) would be required to produce 445 g nitric acid? NH₃ + O₂  HNO₃ + H₂O

Correct Answer
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A

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Calculate the molar mass of phosphoric acid, H₃PO₄.

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Joseph Priestley's discovery of oxygen involved the unbalanced chemical reaction provided here. What mass of oxygen would be produced from the decomposition of 12.3 g of HgO? HgO  Hg + O₂

Correct Answer
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What is the meaning of the letter "s" in the following chemical equation? C₍_s₎ + O₂₍_g₎ CO₂₍_g₎

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C

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How many molecules are contained in 0.650 g acetaminophen (C₈H₉NO₂) ?

Correct Answer
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