Answers2026-2027_MDCPS_2003345_Chemistry_1_B-CROxidation-Reduction

Oxidation-Reduction — Cumulative exam Answers

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21
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A beam of light passes though a liquid in a test tube without scattering. Which type of mixture is most likely in the test tube?

A
colloid
B
emulsion
C
solution
D
suspension
22
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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
23

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.
24

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.
25

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
26

Ca(OH)2 is added to a large beaker of water. How is the solution different from the original water?

A
The solution turns blue litmus to red.
B
The solution turns phenolphthalein pink.
C
The solution has more hydrogen ions.
D
The solution has fewer hydroxide ions.
27

Which is the formula mass of Na2SO4?

A
119.06 amu
B
125.98 amu
C
142.05 amu
D
174.12 amu
28

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.
29

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
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

Which contributes to the dissolution of sugar in water?

A
the dissociation of an ionic compound in water
B
a strong pull of water molecules on an ionic compound
C
the dissociation of a polar covalent compound in water
D
a strong pull of water molecules on a polar covalent compound
32

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
33

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
34

Consider the reaction below.2C6H14 + 19O2 12CO2 + 14H2OHow many moles of hexane (C6H14) must burn to form 18.4 mol of carbon dioxide?

Question illustration
A
1.53 mol
B
3.07 mol
C
110. mol
D
175. mol
35

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
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

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.
38

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
39

Which best describes the function of a centrifuge?

A
to separate the solute from the solvent
B
to separate the dissolved part of a solution into layers
C
to separate a mixture by heating it for a long period of time
D
to separate the undissolved particles of a mixture into layers
40

Complete combustion of a 0.600-g sample of a compound in a bomb calorimeter releases 24.0 kJ of heat. The bomb calorimeter has a mass of 1.30 kg and a specific heat of 3.41 J/(gi°C). If the initial temperature of the calorimeter is 25.5°C, what is its final temperature?Use .

Question illustration
A
30.9°C
B
34.5°C
C
44.0°C
D
51.5°C

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