Question 1

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

Accepted Answer

Ionic bonds involve the transfer of electrons from one atom to another, while covalent bonds involve the sharing of electron pairs.

Question 2

A student is analyzing a sample of sodium. If the sample contains 11 protons and 12 neutrons, what is the mass number of this sodium atom?

Accepted Answer

$$23$$

Question 3

Why are noble gases generally unreactive?

Accepted Answer

They have a full valence shell, making them energetically stable.

Question 4

Which of the following chemical equations is balanced according to the Law of Conservation of Mass?

Accepted Answer

$$2H_2 + O_2$ \rightarrow 2H_2O$$

Question 5

A solution has a pH of 2. Which statement best describes this solution?

Accepted Answer

It is a strong acid.

Question 6

Which of the following substances is most likely to form an ionic bond?

Accepted Answer

Sodium and chlorine

Question 7

If a chemical reaction produces water, which type of bond is present between the hydrogen and oxygen atoms in a water molecule?

Accepted Answer

Covalent bond

Question 8

Which of the following best explains why sodium chloride (table salt) forms a crystalline solid?

Accepted Answer

It is formed by the electrostatic attraction between oppositely charged ions.

Question 9

A student adds a substance to water and measures the pH as 9. What can be concluded about the substance?

Accepted Answer

It is basic (alkaline).

Question 10

Which of the following statements about the Law of Conservation of Mass is correct?

Accepted Answer

The total mass of reactants equals the total mass of products in a chemical reaction.

Question 11

Which of the following pairs of elements would most likely form a covalent bond?

Accepted Answer

Oxygen and hydrogen

Question 12

A chemist wants to identify an unknown element. If the element has 11 protons, which element is it?

Accepted Answer

Sodium

Question 13

Which of the following best describes the electron arrangement in a noble gas?

Accepted Answer

It has a full valence shell.

Question 14

Which of the following is a correct statement about acids and bases?

Accepted Answer

A substance with a pH of 13 is basic.

Question 15

Which of the following is the correct balanced equation for the reaction of hydrogen and oxygen to form water?

Accepted Answer

$$2H_2 + O_2$ \rightarrow 2H_2O$$

Question 16

Which of the following best describes what happens to electrons in a covalent bond?

Accepted Answer

Electrons are shared between atoms.

Question 17

A solution turns universal indicator paper blue. What does this indicate about the solution's pH?

Accepted Answer

The solution is basic.

Question 18

Which of the following is a real-world example of an ionic compound?

Accepted Answer

Table salt ($$NaCl)$$

Question 19

If a chemical reaction is not balanced, which law is being violated?

Accepted Answer

Law of Conservation of Mass

Question 20

Which of the following best explains why water is a polar molecule?

Accepted Answer

It has an uneven distribution of electrons due to covalent bonding.

Atomic Structure, Bonding, and Chemical Properties: Study Guide

Study Guide - Practice Questions