Question 1

Which of the following statements best describes what occurs during the alpha decay of uranium-238, as shown in the provided diagram?

Accepted Answer

The uranium-238 nucleus emits an alpha particle, decreasing its atomic number by 2 and its mass number by 4.

Question 2

Which type of radiation is described by the following properties: mass number of 0, atomic number of +1, and is emitted when a proton is converted to a neutron?

Accepted Answer

Positron

Question 3

A Geiger counter is used to detect which types of radiation?

Accepted Answer

Beta and gamma radiation

Question 4

Which shielding material is most appropriate for protecting against gamma rays?

Accepted Answer

Lead shield or thick concrete wall

Question 5

What is the balanced nuclear equation for the beta decay of carbon-14?

Accepted Answer

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

Question 6

Which of the following best explains why rapidly dividing cells are more sensitive to radiation?

Accepted Answer

They undergo frequent DNA replication, making them more susceptible to radiation-induced mutations.

Question 7

A sample contains 36 mg of strontium-90, which has a half-life of 38.1 years. How much will remain after 114.3 years?

Accepted Answer

4.5 mg

Question 8

Which of the following is a real-world application of gamma radiation in food safety?

Accepted Answer

Gamma rays are used to kill bacteria in foods, extending shelf life and reducing spoilage.

Question 9

Which equation correctly represents the nuclear fission of uranium-235 when bombarded with a neutron?

Accepted Answer

$$^{1}_{0}\mathrm{n} $$+ ^{235}$$_{92}\mathrm{U} \$$rightarrow ^{91}$$_{36}\mathrm{Kr} $$+ ^{142}$$_{56}\mathrm{Ba} + 3$$^{1}$$_{0}\mathrm{n} + 	ext{energy}$$

Question 10

Which of the following statements about nuclear fusion is correct?

Accepted Answer

It combines small nuclei into larger nuclei, releasing large amounts of energy.

Question 11

A radioactive isotope has a half-life of 8 days. If you start with 20 mg, how much remains after 24 days?

Accepted Answer

2.5 mg

Question 12

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

Accepted Answer

Measuring the amount of carbon-14 remaining in a sample and using its half-life to estimate the time since the organism died.

Question 13

Which of the following is true about the biological effects of alpha particles?

Accepted Answer

They do not penetrate the skin but can cause extensive damage if ingested or inhaled.

Question 14

Which of the following nuclear reactions is an example of positron emission?

Accepted Answer

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

Question 15

Which of the following is a correct statement about the units of radiation measurement?

Accepted Answer

The sievert (Sv) is the SI unit for biological damage caused by radiation.

Question 16

Which of the following best describes a nuclear chain reaction?

Accepted Answer

Each fission event produces neutrons that cause further fission events, leading to a self-sustaining reaction.

Question 17

Which of the following is a property of gamma rays?

Accepted Answer

They have a mass number of 0 and a charge of 0.

Question 18

Which of the following best explains why the FDA requires a symbol on irradiated foods?

Accepted Answer

To inform consumers that the food has been treated with radiation to kill bacteria and extend shelf life.

Question 19

Which of the following is true about the process of nuclear bombardment?

Accepted Answer

It involves bombarding a stable nucleus with high-speed particles to produce radioactive isotopes.

Nuclear Chemistry: Radioactivity, Nuclear Reactions, and Applications

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