AnswersTX-Chemistry B-Credit Recovery Summer SchoolCumulative Exam

Cumulative Exam — Cumulative exam Answers

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A chemistry journal requires that all new research papers be peer reviewed by other scientists before they are published. This allows which of the following?

A
The reviewers can determine the experiment’s feasibility.
B
The reviewers can determine the experiment’s validity.
C
The reviewers can include their own findings with the research.
D
The reviewers can determine if they will help fund the research.
42
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If the pressure of a gas is 2.000 × 104 kPa, what is its pressure in atm?

A
26.32 atm
B
197.4 atm
C
1.013 ´ 106 atm
D
2.026 ´ 106 atm
43

The expression below was formed by combining different gas laws. Which law was used to determine the relationship between the volume and the number of moles in this equation?

Question illustration
A
Boyle’s law
B
Charles’s law
C
Avogadro’s law
D
Gay-Lussac’s law
44

The volume of a fixed amount of gas is doubled, and the absolute temperature is doubled. According to the ideal gas law, how has the pressure of the gas changed?

A
It has increased to two times its original value.
B
It has increased to four times its original value.
C
It has decreased to one-half its original value.
D
It has stayed the same.
45

Consider the half reactions below for a chemical reaction.What is the overall equation for this chemical reaction?

Question illustration
A
Upper M g (s) plus 2 upper H superscript plus (a q) right arrow upper M g superscript 2 plus (a q) plus upper H subscript 2 (g).
Option A
B
Upper M g (s) plus 2 upper H superscript plus (a q) right arrow upper M g superscript 2 plus (a q) plus 2 e superscript minus.
Option B
C
Upper M g superscript 2 plus (a q) plus upper H subscript 2 (g) right arrow upper M g (s) plus 2 upper H superscript plus (a q).
Option C
D
Upper M g (s) plus 2 upper H right arrow upper M g (a q) plus upper H subscript 2 (g).
Option D
46

Water is dissolved into n-butanol (a polar liquid). Which is the second step at the molecular level as water dissolves into n-butanol?

A
n-Butanol mixes with water.
B
Water molecules are carried into n-butanol.
C
n-Butanol molecules surround water molecules.
D
n-Butanol molecules are attracted to the surface of the water molecules.
47

Which answer choice represents a balanced alpha emission nuclear equation?

A
Superscript 52 subscript 26 upper F e right arrow superscript 52 subscript 25 upper M n plus superscript o subscript plus 1 e.
Option A
B
Superscript 235 subscript 92 upper U right arrow superscript 239 subscript 94 upper P u s plus superscript 4 subscript 2 upper H e.
Option B
C
Superscript 189 subscript 83 upper Bi right arrow superscript 185 subscript 81 upper T l plus superscript 4 subscript 2 H e.
Option C
D
Superscript 14 subscript 6 upper C right arrow superscript 14 subscript 7 upper N plus superscript 0 subscript negative 1 e.
Option D
48

The following half-reaction method is used to balance oxidation-reduction equations.(1) Determine which atoms change oxidation state from reactant to product in the reaction.(2) Identify and write half reactions (oxidation and reduction).(3) Return to the original chemical equation to balance it.(a) Insert the coefficients from the half reactions first.(b) Inspect the number of each atom on each side for all elements.Which important step is missing from this procedure?

A
Check other reactions similar to this one.
B
Name the elements that are involved in the reaction.
C
Make sure the reduction half reaction is identified first.
D
Balance the half reactions based on the number of electrons.
49

Which statement is true about the electrons in each polar bond of a water molecule?

A
They are more attracted by the oxygen atom than by the hydrogen atom.
B
They are more attracted by the hydrogen atom than by the oxygen atom.
C
They are equally attracted by the hydrogen and oxygen atoms.
D
They are equally repelled by the hydrogen and oxygen atoms.
50

Which describes an alkaline solution?

A
pH less than 7
B
pH equal to 7
C
basic
D
acidic

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