CHEM 121 Final Exam 2025 — Complete Study Guide, Practice Test Questions, and Answer Key for General Chemistry

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CHEM 121 Final Exam 2025 — Complete
Study Guide, Practice Test Questions, and
Answer Key for General Chemistry


Prepare for your CHEM 121 Final Exam 2025 with this complete study guide and practice
test covering atoms, bonding, stoichiometry, thermochemistry, gases, and chemical
reactions. Review key general chemistry concepts, formulas, and past exam questions to boost
your grades and ace your CHEM 121 final with confidence.




• CHEM 121 final exam 2025
• CHEM 121 study guide
• CHEM 121 practice test questions
• General Chemistry 1 final exam answers




Using d = m/V, what is the (V)olume of a solid that has a density is 3.14g/cm3 and has a mass of 7.04
grams?

Select one:

a. 22.1 cm3

b. 22.11 cm3

c. 2.24 cm3

d. 2.242 cm3 - ANSWER-c. 2.24 cm3



Increasing the pressure on a gas at constant temperature does what to the volume of the gas?

Select one:

a. increases it

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b. decreases it

c. has no effect on it

d. increases it up to a certain point - ANSWER-b. decreases it



Convert a temperature of 45°C into Kelvins.

Select one:

a. -45 K

b. -228 K

c. 228 K

d. 318 K - ANSWER-d. 318 K



The temperature of a liquid is decreased. What happens to the vapor pressure of the liquid as a result?

Select one:

a. it increases

b. it decreases

c. it is not changed

d. it increases or decreases depending on how large a temperature change occurs - ANSWER-b. it
decreases




According to the law of conservation of matter, which of the following may NEVER occur as a result of a
chemical reaction

Select one:

a. creation of new chemical species.

b. reaction of starting materials

c. rearranged to form new substances

d. reduction in total mass - ANSWER-d. reduction in total mass



What is the oxidation number of Mn in KMnO4?

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Select one:

a. +9

b. +5

c. +7

d. +4 - ANSWER-c. +7



What is the oxidation number of Cl in HClO3?

Select one:

a. +2

b. +3

c. +4

d. +5 - ANSWER-d. +5



A pressure is recorded as 622 torr. What is this pressure in atm?

Select one:

a. 1.22

b. 0.818

c. 5.17

d. 0.0393 - ANSWER-b. 0.818




A 5.00 liter gas sample is collected at a temperature and pressure of 27.0°C and 1.20 atm. It is desired to
transfer the gas to a 3.00 liter container at a pressure of 1.00 atm. What must be the temperature of the
gas in the 3.00 liter container?

Select one:

a. 216 K

b. 417 K

c. 13.5?C

d. 150 K - ANSWER-d. 150 K

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In which of the following processes does the energy of the water increase?

Select one:

a. water freezes

b. steam condenses to liquid

c. water evaporates

d. more than one response is correct - ANSWER-c. water evaporates



When steam condenses, it absorbs heat.

Select one:

a. True

b. False - ANSWER-b. False



Moving water to a point 1500 meters higher that you are at now will have what effect on its boiling
point?

Select one:

a. increase it

b. lower it

c. will have no effect

d. too little information to know - ANSWER-b. lower it



A gas sample is collected in a latex balloon (it can easily stretch or shrink). What happens to the density
of the gas sample as the sample is heated?

Select one:

a. decreases

b. increases

c. does not change

d. could increase or decrease, depending on how much it was heated - ANSWER-a. decreases