Question 1

Which of these aqueous solutions has the highest pH?

Accepted Answer

A)  0.100 M NaOH
B)  0.100 M Na2O
C)  0.100 M Na3N
D)  all of these solutions have the same pH due to the leveling effect
E)  these all are solutions of weak bases, so Kb values are needed in order to decideF) A) and D)
G) None of the above

Question 2

Why is it especially dangerous to mix cyanide salts with acids? Write a chemical equation to illustrate your answer.

Accepted Answer

The cyanide ion reacts with acid to form hydrogen cyanide, a very weak acid that comes out of solution as a gas.Inhaled in even very small amounts it can rapidly cause death (the cyanide ion bonds essentially irreversibly to Fe(III)in cytochrome oxidase, an important enzyme in metabolism).
NaCN(s)+ HCl(aq)$\to$ HCN(aq)+ NaCl(aq), followed by
HCN(aq)$\to$ HCN(g)
or combining these reactions
NaCN(s)+ HCl(aq)$\to$ HCN(g)+ NaCl(aq)
(answers will vary depending on salt and acid used in the equation)

Question 3

Which of these substances is the active ingredient in ordinary household bleach?

Accepted Answer

A)  HCl
B)  Cl2
C)  NaCl
D)  NaClO
E)  NaClO4F) C) and D)
G) A) and D)

Question 4

The bond energy of F2 is anomalously low, in comparison with the other halogens, due to the small size of the fluorine atom. Which of the following periodic properties is also anomalously low in the case of fluorine?

Accepted Answer

A)  first ionization energy
B)  electron affinity
C)  electronegativity
D)  diatomic bond length
E)  ionic radiusF) A) and B)
G) C) and D)

Question 5

The Ostwald process is the main method for the manufacture of nitric acid. In the first step of this process

Accepted Answer

A)  nitrogen and hydrogen react to form NH3.
B)  ammonia is burned in O2 to generate N2 and H2O.
C)  nitrogen and oxygen react to form NO2.
D)  nitrogen and oxygen react to form NO.
E)  ammonia is burned with O2 to generate NO and H2O.F) D) and E)
G) C) and E)

Question 6

Which of these aqueous solutions has the lowest pH?

Accepted Answer

A)  0.100 M NaOH
B)  0.100 M Na2O
C)  0.100 M Na3N
D)  all of these solutions have the same pH due to the leveling effect
E)  these all are solutions of weak bases, so Kb values are needed in order to decideF) C) and E)
G) All of the above

Question 7

Hydrogen plays an important role in many industrial processes. Write a balanced chemical equation for its production by the water gas reaction.

Accepted Answer

C(s)+ H₂O(g)$\to$CO(g)+ H₂(g)

Question 8

A chemical formula of the carbide ion is

Accepted Answer

A)  Si4-
B)  C2-
C)  C22-
D)  CN-
E)  C3-F) B) and D)
G) B) and C)

Question 9

Write the chemical formula of the oxide ion.

Accepted Answer

The answer of Write the chemical formula of the oxide...

Question 10

Ozone (O3) and oxygen gas (O2) are examples of

Accepted Answer

A)  isotopes.
B)  allotropes.
C)  polymorphs.
D)  alloys.
E)  amphoterism.F) A) and E)
G) A) and D)

Question 11

The main commercial source of bromine is

Accepted Answer

A)  silver bromide ore.
B)  seawater.
C)  the Frasch process.
D)  phosphate rock.
E)  the Ostwald process.F) B) and D)
G) All of the above

Question 12

Write the formula for the binary hydride you would expect calcium to form.

Accepted Answer

The answer of Write the formula for the binary hydride...

Question 13

Which of these substances is being considered as a replacement fuel for gasoline?

Accepted Answer

A)  D2O
B)  H2
C)  NO2
D)  F2
E)  HeF) B) and E)
G) A) and D)

Question 14

The term catenation describes the

Accepted Answer

A)  tendency of carbon atoms to form cations in the presence of alkali metals.
B)  process of creating synthetic gas from coal.
C)  extraction of precious metals with sodium or potassium cyanide.
D)  ability of carbon atoms to form long chains and rings.
E)  interaction of Group 4A elements with Group 8A elements at high pressures and temperatures to form coordination compounds.F) All of the above
G) B) and E)

Question 15

P4O6 and P4O10 are allotropes of phosphorus.

Accepted Answer

A) True 
 B)False

Question 16

Write the chemical formula of the superoxide ion.

Accepted Answer

O<sub>2</sub><sup>-</sup>

Question 17

The presence of ozone in the upper atmosphere is important because

Accepted Answer

A)  O3 absorbs outgoing radiation from the earth's surface, thus helping to keep the earth warm.
B)  O3 absorbs harmful solar radiation.
C)  O3 dissolves in water droplets and is very reactive.
D)  O3 is a major reactant in photosynthesis.E) B) and C)
F) None of the above

Question 18

Which one of these elements is a liquid at room temperature?

Accepted Answer

A)  bromine
B)  chlorine
C)  fluorine
D)  iodine
E)  seleniumF) B) and E)
G) A) and B)

Question 19

Which one of these elements is not a gas at room temperature?

Accepted Answer

A)  chlorine
B)  fluorine
C)  nitrogen
D)  oxygen
E)  sulfurF) A) and B)
G) B) and D)

Question 20

Write a balanced chemical equation to show the production of chlorine by the chlor-alkali process.

Accepted Answer

The answer of Write a balanced chemical equation to show...

Exam 21: Nonmetallic Elements and Their Compounds

Which of these aqueous solutions has the highest pH?

Correct Answer
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Why is it especially dangerous to mix cyanide salts with acids? Write a chemical equation to illustrate your answer.

Which of these substances is the active ingredient in ordinary household bleach?

Correct Answer
verified

The bond energy of F₂ is anomalously low, in comparison with the other halogens, due to the small size of the fluorine atom. Which of the following periodic properties is also anomalously low in the case of fluorine?

Correct Answer
verified

The Ostwald process is the main method for the manufacture of nitric acid. In the first step of this process

Correct Answer
verified

Which of these aqueous solutions has the lowest pH?

Correct Answer
verified

Hydrogen plays an important role in many industrial processes. Write a balanced chemical equation for its production by the water gas reaction.

Correct Answer
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C(s)+ H₂O(g)\(\to\)CO(g)+ H₂(g)

A chemical formula of the carbide ion is

Correct Answer
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Write the chemical formula of the oxide ion.

Correct Answer
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Ozone (O₃) and oxygen gas (O₂) are examples of

Correct Answer
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The main commercial source of bromine is

Correct Answer
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Write the formula for the binary hydride you would expect calcium to form.

Correct Answer
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Which of these substances is being considered as a replacement fuel for gasoline?

Correct Answer
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The term catenation describes the

Correct Answer
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P₄O₆ and P₄O₁₀ are allotropes of phosphorus.

Correct Answer
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Write the chemical formula of the superoxide ion.

Correct Answer
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O₂^-

The presence of ozone in the upper atmosphere is important because

Correct Answer
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Which one of these elements is a liquid at room temperature?

Correct Answer
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Which one of these elements is not a gas at room temperature?

Correct Answer
verified

Write a balanced chemical equation to show the production of chlorine by the chlor-alkali process.

Correct Answer
verified

Exam 21: Nonmetallic Elements and Their Compounds

Which of these aqueous solutions has the highest pH?

Correct AnswerverifiedShow Answer

Why is it especially dangerous to mix cyanide salts with acids? Write a chemical equation to illustrate your answer.

Which of these substances is the active ingredient in ordinary household bleach?

Correct AnswerverifiedShow Answer

The bond energy of F2 is anomalously low, in comparison with the other halogens, due to the small size of the fluorine atom. Which of the following periodic properties is also anomalously low in the case of fluorine?

Correct AnswerverifiedShow Answer

The Ostwald process is the main method for the manufacture of nitric acid. In the first step of this process

Correct AnswerverifiedShow Answer

Which of these aqueous solutions has the lowest pH?

Correct AnswerverifiedShow Answer

Hydrogen plays an important role in many industrial processes. Write a balanced chemical equation for its production by the water gas reaction.

Correct AnswerverifiedC(s)+ H2O(g)\(\to\)CO(g)+ H2(g)

A chemical formula of the carbide ion is

Correct AnswerverifiedShow Answer

Write the chemical formula of the oxide ion.

Correct AnswerverifiedShow Answer

Ozone (O3) and oxygen gas (O2) are examples of

Correct AnswerverifiedShow Answer

The main commercial source of bromine is

Correct AnswerverifiedShow Answer

Write the formula for the binary hydride you would expect calcium to form.

Correct AnswerverifiedShow Answer

Which of these substances is being considered as a replacement fuel for gasoline?

Correct AnswerverifiedShow Answer

The term catenation describes the

Correct AnswerverifiedShow Answer

P4O6 and P4O10 are allotropes of phosphorus.

Correct AnswerverifiedShow Answer

Write the chemical formula of the superoxide ion.

Correct AnswerverifiedO2-

The presence of ozone in the upper atmosphere is important because

Correct AnswerverifiedShow Answer

Which one of these elements is a liquid at room temperature?

Correct AnswerverifiedShow Answer

Which one of these elements is not a gas at room temperature?

Correct AnswerverifiedShow Answer

Write a balanced chemical equation to show the production of chlorine by the chlor-alkali process.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

The bond energy of F₂ is anomalously low, in comparison with the other halogens, due to the small size of the fluorine atom. Which of the following periodic properties is also anomalously low in the case of fluorine?

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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C(s)+ H₂O(g)\(\to\)CO(g)+ H₂(g)

Correct Answer
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Correct Answer
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Ozone (O₃) and oxygen gas (O₂) are examples of

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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P₄O₆ and P₄O₁₀ are allotropes of phosphorus.

Correct Answer
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Correct Answer
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O₂^-

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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