AnswersTX-Chemistry B-Credit Recovery Summer SchoolCumulative Exam

Cumulative Exam — Cumulative exam Answers

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21
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Which of the following is an oxidation-reduction reaction?

A
SO2(g) + H2O(l) H2SO3(aq)
Option A
B
CaCO3(s) CaO(s) + CO2(g)
Option B
C
Ca(OH)2(s) + H2CO3(l) CaCO3(aq) + 2H2O(l)
Option C
D
C6H12O6(s) + 6O2(g) 6CO2(g) + 6H2O(l)
Option D
22
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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
23

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
24

A sample of propane (C3H8) has a mass of 0.47 g. The sample is burned in a bomb calorimeter that has a mass of 1.350 kg and a specific heat of 5.82 J/(g • °C). How much energy is released by the reaction if the temperature of the calorimeter rises by 2.87°C?Use .

Question illustration
A
7.85 kJ
B
10.6 kJ
C
22.5 kJ
D
47.9 kJ
25

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
26

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
27

A student requires 2.00 L of 0.100 M NH4NO3 from a 1.75 M NH4NO3 stock solution. What is the correct way to get the solution?Use .

Question illustration
A
Measure 114 mL of the 1.75 M solution, and dilute it to 1.00 L.
B
Measure 114 mL of the 1.75 M solution, and dilute it to 2.00 L.
C
Measure 8.75 mL of the 1.75 M solution, and dilute it to 2.00 L.
D
Measure 8.75 mL of the 0.100 M solution, and dilute it to 2.00 L.
28

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.
29

The reaction of a Lewis acid with a Lewis base would most likely be accompanied by an increase in which item?

A
covalent bonds
B
hydronium ions
C
electron pairs
D
hydroxide ions
30

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)
31

Read the table below.Reduction Half-ReactionStandard Reduction Potential (V)Which reactants would lead to a spontaneous reaction?

Question illustration
A
Mn2+ and Al
B
Mn and Al3+
C
Al and Mn
D
Mn2+ and Al3+
32

A radioactive nuclide that is used for geological dating has an atomic number of 19 and mass number 40. Which is the symbol of this nuclide?

A
Superscript 19 subscript 21 upper K.
Option A
B
Superscript 21 subscript 19 upper K.
Option B
C
Superscript 40 subscript 19 upper K.
Option C
D
Superscript 19 subscript 40 upper K.
Option D
33

Which is a characteristic of nuclear fission?

A
releases nonradioactive waste only
B
involves the collision of two nuclei
C
releases small amounts of energy compared to fossil fuels
D
involves the splitting of an atom into two or more fragments
34

A solar panel combines multiple photovoltaic cells. Which type of energy is used to power a solar panel?

A
kinetic energy
B
thermal energy
C
electromagnetic energy
D
gravitational potential energy
35

What is 16.00 kPa in atm?

A
0.1579 atm
B
6.333 atm
C
1,621 atm
D
12,160 atm
36

Which reaction takes place in a nuclear fission reactor?

A
Superscript 13 subscript 6 upper C plus superscript 1 subscript 1 upper H right arrow superscript 14 subscript 7 upper N.
Option A
B
Superscript 239 subscript 94 upper P u plus superscript 4 subscript 2 upper H e right arrow superscript 242 subscript 96 upper C m.
Option B
C
Superscript 59 subscript 27 upper C o plus superscript 4 subscript 2 upper H e right arrow superscript 60 subscript 27 upper C o plus superscript 1 subscript 0 n.
Option C
D
Superscript 235 subscript 90 upper U plus superscript 1 subscript 0 n right arrow superscript 94 subscript 36 upper K r plus superscript 139 subscript 56 upper B a plus 3 superscript 1 subscript 0 n.
Option D
37

Which statement best describes what makes a base weak?

A
A base is weak when it forms few ions in water.
B
A base is weak when only a little of it is dissolved in water.
C
A base is weak when its concentration is high.
D
A base is weak when it totally forms ions in water.
38

Consider the redox reaction below.Which statement correctly describes a half-reaction that is taking place?

Question illustration
A
Hydrogen is oxidized from +1 to 0.
B
Chlorine is reduced from –1 to 0.
C
Aluminum is oxidized from 0 to +3.
D
Hydrogen is reduced from 0 to –1.
39

Two cups of coffee, one that is at 10°C and one that is at 20°C, are mixed. Which statement about the temperature of the mixture is correct?

A
There is no kinetic energy transfer so the temperature of the coffee in the warmer cup is the final temperature.
B
The kinetic theory dictates that the temperature of the coffee in the cooler cup is the final temperature.
C
Energy is transferred from faster moving molecules to slower moving molecules, and the result is the average of 15°C.
D
Energy transfer occurs as the molecules collide, and the result is additive; the final temperature is 30°C.
40

Which is the first step in the dissolving process?

A
The solute becomes like the solvent.
B
The solute molecules are carried into the solution.
C
The solvent molecules surround the solute particles.
D
The solvent molecules are attracted to particles at the surface of the solute.

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