Question 1

Which of the following statements best describes an isotope?

Accepted Answer

Atoms of the same element with different numbers of neutrons.

Question 2

Which equation correctly represents the alpha decay of Uranium-238?

Accepted Answer

$$^{238}_{92}\mathrm{U} \$$rightarrow ^{234}$$_{90}\mathrm{Th} $$+ ^{4}$$_{2}\mathrm{He}$$

Question 3

A sample of gold-198 ($$^{198}\mathrm{Au}) $$has a half-life of 2.695 days. If you start with 125 grams, how much remains after 8.50 days?

Accepted Answer

13.8 grams

Question 4

Which of the following is a correct representation of beta decay?

Accepted Answer

$$^{14}_{6}\mathrm{C} \$$rightarrow ^{14}$$_{7}\mathrm{N} $$+ ^{0}$$_{-1}\mathrm{e}$$

Question 5

Which device is commonly used to detect and measure ionizing radiation in nuclear chemistry labs?

Accepted Answer

Geiger-Müller counter

Question 6

Which of the following best explains why nuclear fusion is considered a cleaner energy source than nuclear fission?

Accepted Answer

Fusion produces little long-lived radioactive waste compared to fission.

Question 7

What is the main reason Uranium-238 is useful for dating rocks and Earth's formation?

Accepted Answer

It has a half-life of 4.5 billion years.

Question 8

Which of the following nuclear reactions is an example of fission?

Accepted Answer

$$^{235}_{92}\mathrm{U} $$+ ^{1}$$_{0}\mathrm{n} \$$rightarrow ^{141}$$_{56}\mathrm{Ba} $$+ ^{92}$$_{36}\mathrm{Kr} + 3$$^{1}$$_{0}\mathrm{n}$$

Question 9

A radioactive isotope has a half-life of 10 years. If you start with 80 grams, how much remains after 30 years?

Accepted Answer

10 grams

Question 10

Which of the following is NOT a factor that affects nuclear stability?

Accepted Answer

Number of electrons

Question 11

Which of the following best describes the process of carbon-14 dating?

Accepted Answer

Measuring the ratio of carbon-14 to carbon-12 to estimate the age of organic material.

Question 12

Which of the following is a disadvantage of nuclear fission for energy production?

Accepted Answer

It produces radioactive waste that requires long-term storage.

Question 13

Which of the following nuclear reactions represents positron emission?

Accepted Answer

$$^{22}_{11}\mathrm{Na} \$$rightarrow ^{22}$$_{10}\mathrm{Ne} $$+ ^{0}$$_{+1}\mathrm{e}$$

Question 14

Which of the following is a real-world application of radioisotopes in medicine?

Accepted Answer

Using iodine-131 to diagnose and treat thyroid disorders.

Question 15

Which of the following statements about nuclear fusion in stars is correct?

Accepted Answer

Fusion in stars converts hydrogen into helium, releasing energy.

Question 16

Which of the following best describes the difference between alpha and beta decay?

Accepted Answer

Alpha decay emits a helium nucleus, while beta decay emits an electron.

Question 17

Which of the following is a correct balanced nuclear equation for the electron capture of Argon-37?

Accepted Answer

$$^{37}_{18}\mathrm{Ar} $$+ ^{0}$$_{-1}\mathrm{e} \$$rightarrow ^{37}$$_{17}\mathrm{Cl}$$

Question 18

Which of the following is a challenge currently facing nuclear fusion as an energy source?

Accepted Answer

Fusion reactors require extremely high temperatures and pressures.

Question 19

Which of the following best explains why radioactive decay series occur?

Accepted Answer

Large radioactive nuclei cannot stabilize by a single decay and must undergo a series of decays to reach a stable nuclide.

Nuclear Chemistry: Structure, Decay, and Applications

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