Question 1

Which of the following statements best describes alpha ($$\alpha) $$radiation?

Accepted Answer

It is a particle composed of two protons and two neutrons, with a mass number of 4 and a charge of +2.

Question 2

Which of the following is the correct nuclear equation for the alpha decay of uranium-238 ($$^{238}_{92}\mathrm{U}$$)?

Accepted Answer

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

Question 3

A radioisotope has a half-life of 8 hours. If you start with a 40 mg sample, how much remains after 24 hours?

Accepted Answer

5 mg

Question 4

Which of the following best describes a positron ($$\beta^+$$)?

Accepted Answer

A particle with the same mass as an electron but a positive charge.

Question 5

Which type of radiation can be stopped by a sheet of paper?

Accepted Answer

Alpha ($$\alpha) $$radiation

Question 6

What is the main reason why radioactive nuclei emit radiation?

Accepted Answer

To achieve a more stable ratio of protons to neutrons.

Question 7

Which of the following is the correct symbol for a beta particle?

Accepted Answer

$$^{0}_{-1}\beta$$

Question 8

A hospital worker is exposed to radiation and wears a dosimeter. What does the dosimeter measure?

Accepted Answer

The amount of radiation absorbed by the worker over time.

Question 9

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

Accepted Answer

Using iodine-131 ($$^{131}_{53}\mathrm{I}) to $$diagnose and treat thyroid disorders.

Question 10

Which of the following statements about gamma ($$\gamma) $$radiation is correct?

Accepted Answer

It has no mass and no charge, and is a form of electromagnetic radiation.

Question 11

Which of the following best describes the process of transmutation?

Accepted Answer

The conversion of one element into another by changing the number of protons in the nucleus.

Question 12

Which of the following is the correct definition of half-life?

Accepted Answer

The time required for half of the radioactive atoms in a sample to decay.

Question 13

Which of the following is the correct balanced nuclear equation for the positron emission of sodium-22 ($$^{22}_{11}\mathrm{Na}$$)?

Accepted Answer

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

Question 14

A 64-mg sample of Element-126 (half-life = 16 hours) is left for 26 hours. How much remains?

Accepted Answer

19 mg

Question 15

Which of the following best explains why gamma radiation is more penetrating than alpha or beta radiation?

Accepted Answer

Gamma radiation has no mass or charge and travels at the speed of light, allowing it to penetrate materials more deeply.

Question 16

Which of the following units is used to measure the biological effect of radiation on human tissue?

Accepted Answer

rem

Question 17

Which of the following best describes how radioisotopes are produced for medical use?

Accepted Answer

By bombarding stable nuclei with neutrons or other particles in a nuclear reactor or particle accelerator.

Question 18

Which of the following statements about the use of radiation in the food industry is correct?

Accepted Answer

Radiation is used to kill bacteria and other pathogens, increasing the shelf life of food.

Question 19

Which of the following is the correct order of increasing penetration power for the types of radiation discussed?

Accepted Answer

Alpha \u003c Beta \u003c Gamma

Question 20

Which of the following best describes a decay curve?

Accepted Answer

A graph showing the decrease in the amount of a radioactive isotope over time.

Nuclear Chemistry Study Guide – Step-by-Step Guidance for CHEM 1151 Worksheet

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