Question 1

Which type of radiation consists of high-energy electromagnetic waves and is commonly used in medical imaging to detect bone fractures?

Accepted Answer

Gamma radiation

Question 2

A radioactive isotope has a half-life of 4 hours. If you start with 80 grams, how much will remain after 12 hours?

Accepted Answer

$$80 \div 2^3$ = 10$$ grams

Question 3

Which of the following best describes the difference between ionic and covalent compounds?

Accepted Answer

Ionic compounds transfer electrons between atoms, covalent compounds share electrons.

Question 4

Which formula correctly represents the calculation of energy released ($$Q) in a $$nuclear reaction using mass defect ($$\Delta m$$)?

Accepted Answer

$$Q = \Delta m 	imes c^2$

Question 5

Which of the following is a polyatomic ion?

Accepted Answer

$$\mathrm{SO_4$^{2-}}$$

Question 6

A patient receives a dose of 0.5 Sv of radiation. Which unit is used to measure the biological effect of this exposure?

Accepted Answer

Sievert (Sv)

Question 7

Which of the following molecules is nonpolar despite having polar bonds?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 8

What is the correct electron configuration for a chloride ion ($$\mathrm{Cl^-}$$)?

Accepted Answer

$$1s^2$$ $$2s^2$$ $$2p^6$$ $$3s^2$$ $$3p^6$$

Question 9

Which intermolecular force is primarily responsible for the high boiling point of water?

Accepted Answer

Hydrogen bonding

Question 10

Which of the following best describes the VSEPR shape of methane ($$\mathrm{CH_4$}$$)?

Accepted Answer

Tetrahedral

Question 11

Which statement about transition metals is correct?

Accepted Answer

Transition metals can form multiple oxidation states.

Question 12

Which of the following is the correct formula for ammonium sulfate?

Accepted Answer

$$\mathrm{(NH_4$)_2SO_4}$$

Question 13

Which of the following best explains why ionic compounds tend to have high melting points?

Accepted Answer

They have strong electrostatic attractions between ions.

Question 14

Which of the following is a correct Lewis structure for carbon dioxide ($$\mathrm{CO_2$}$$)?

Accepted Answer

O=C=O

Question 15

A solution contains 0.1 mol of $$\mathrm{NaCl}$$ dissolved in 1 L of water. What is the molarity of the solution?

Accepted Answer

$$0.1 \ \mathrm{M}$$

Question 16

Which of the following is the correct name for $$\mathrm{$$FeCl_3$$}$$?

Accepted Answer

Iron(III) chloride

Question 17

Which of the following best describes the process of balancing a nuclear equation?

Accepted Answer

Ensuring the total mass number and atomic number are equal on both sides of the equation.

Question 18

Which of the following molecules would have the highest boiling point due to hydrogen bonding?

Accepted Answer

$$\mathrm{NH_3$}$$

Question 19

Which of the following is a correct example of a dispersion force?

Accepted Answer

Attraction between $$\mathrm{O_2$}$$ molecules

Question 20

Which of the following best explains why $$\mathrm{H_2O} is a $$polar molecule?

Accepted Answer

It has a bent shape and unequal sharing of electrons.

CHEM 1110 Exam 3 Study Guide: Nuclear Chemistry, Ionic and Molecular Compounds

Guida di studio - Domande di pratica