AnswersTX-Chemistry BCumulative Exam

Cumulative Exam — Cumulative exam Answers

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Which of the following shows a Bronsted-Lowry acid reacting?

A
CO + NO2 CO2 + NO
Option A
B
NH3 + H+ NH4+
Option B
C
+ H+ HCO3–
Option C
D
HCl + H2O H3O+ + Cl–
Option D
22
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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.
23

The molar mass of NaOH is 40.00 g/mol. If 5.20 g NaOH are dissolved in 0.500 L of solution, what is the molarity of the solution?Use .

Question illustration
A
0.0125 M
B
0.260 M
C
3.85 M
D
7.69 M
24

An experimental procedure requires 10 ml of acid to be dissolved into a beaker of water. An additional 5 ml of acid is added to the solution. Which statement best describes the new solution?

A
the strength of the acid in the solution has been increased
B
the concentration of acid in the solution has decreased by one half
C
the concentration of acid in the solution has been increased
D
the strength of the acid in the solution has decreased by one half
25

What is 16.00 kPa in atm?

A
0.1579 atm
B
6.333 atm
C
1,621 atm
D
12,160 atm
26

The pOH of a solution is 6.0. Which statement is correct?Use and .

Question illustration
A
The pH of the solution is 20.0.
B
The concentration of OH– ions is .
Option B
C
The concentration of OH– ions is .
Option C
D
The pH of the solution is 8.0.
27

During photosynthesis, sunlight shining on a plant is absorbed. Through several chemical reactions, the plant produces sugar, a high-energy compound, from simpler substances. What energy transformation occurs during this process?

A
thermal energy to chemical energy
B
electromagnetic energy to chemical energy
C
kinetic energy to potential energy
D
potential energy to chemical energy
28

Which represents the ionization of a strong electrolyte?

A
CH3OH(l) CH3OH(aq)
Option A
B
K3PO4(s) 3K+(aq) + PO43–(aq)
Option B
C
H2CO3(aq) H+(aq) + HCO3–(aq)
Option C
D
CH3COOH(aq) + H2O(l) H3O+(aq) + CH3COO–(aq)
Option D
29

A mixture of three noble gases has a total pressure of 1.25 atm. The individual pressures exerted by neon and argon are 0.68 atm and 0.35 atm, respectively. What is the partial pressure of the third gas, helium?Use .

Question illustration
A
0.22 atm
B
0.33 atm
C
1.03 atm
D
2.28 atm
30

A gas in a rigid container at 25°C has a pressure of 0.96 atm. A change in temperature causes the pressure to increase to 1.25 atm. What is the new temperature of the gas?Use .

Question illustration
A
–44.2°C
B
32.6°C
C
115°C
D
388°C
31

What is the nuclear binding energy of an atom that has a mass defect of 1.643 10–28 kg? Use E = mc2. (Remember: The speed of light is approximately 3.00 108 m/s.)

Question illustration
A
1.83 10–46 J
Option A
B
4.93 10–20 J
Option B
C
1.48 10–11 J
Option C
D
5.48 1045 J
Option D
32

A sample of an unknown substance has a mass of 0.158 kg. If 2,510.0 J of heat is required to heat the substance from 32.0°C to 61.0°C, what is the specific heat of the substance?Use .

Question illustration
A
0.171 J/(gi°C)
B
0.548 J/(gi°C)
C
15.9 J/(gi°C)
D
86.6 J/(gi°C)
33

A student who is studying atomic reactions creates the following Venn diagram.How should the student label each circle in this diagram?

Question illustration
A
reaction A: chemical; reaction B: nuclear
B
reaction A: nuclear; reaction B: chemical
C
reaction A: strong nuclear; reaction B: weak nuclear
D
reaction A: weak nuclear; reaction B: strong nuclear
34

What is a common use of bases?

A
as a component of vinegar
B
as a component of car batteries
C
to make foods tart
D
to reduce indigestion
35

How does heat differ from temperature?

A
Temperature is the measure of heat.
B
Temperature and heat are the same thing.
C
Temperature measures thermal energy, and heat is the flow of thermal energy.
D
Temperature measures the loss of energy, and heat measures the gain of energy.
36

In the disproportionation reaction CI2 + H2OHCIO + HCI, what describes the oxidation states of the substance Cl?

Question illustration
A
Cl has an oxidation number of 2 in Cl2. It is then reduced to Cl with an oxidation number of 1 in both HCl and HClO.
B
Cl has an oxidation number of –1 in Cl2. It is then oxidized to Cl with an oxidation number of 1 in both HCl and HClO.
C
Cl has an oxidation number of 0 in Cl2. It is then reduced to CI- with an oxidation number of –1 in both HCl and HClO.
D
Cl has an oxidation number of 0 in Cl2. It is then reduced to CI- with an oxidation number of –1 in HCl and is oxidized to Cl+ with an oxidation number +1 in HClO.
37

The following reaction occurs in a car’s catalytic converter.2NO(g) + 2CO(g) N2(g) + 2CO2(g) Which answer best describes the reducing and oxidizing processes in this reaction?

Question illustration
A
NO and CO are both reducing agents.
B
NO and CO are both oxidizing agents.
C
The oxidation state of nitrogen in NO changes from +2 to 0, and the oxidation state of carbon in CO changes from +2 to +4 as the reaction proceeds.
D
The oxidation state of nitrogen in NO changes from 0 to +2, and the oxidation state of carbon in CO changes from +4 to +2 as the reaction proceeds.
38

Which value is most likely to be the pH of a salt solution that is formed by the reaction of a weak acid and a strong base?

A
2.0
B
6.8
C
7.0
D
8.7
39

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
40

A supervisor spends a day inspecting a nuclear plant for potential radiation leaks. She has to move throughout the plant inspecting all the equipment and machinery. She needs to take two different radiation detection devices to help ensure her safety and to find radiation leaks. She needs the results immediately. Which two devices would be the best choices for the task?

A
Geiger counter and scintillation counter
B
Geiger counter and cloud chamber
C
cloud chamber and scintillation counter
D
film badge and scintillation counter

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