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 a metal to a non-metal, while covalent bonds involve the sharing of electrons between two non-metals.

Question 2

A student is given a sample of sodium with 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 of electrons, making them energetically stable.

Question 4

Which of the following chemical equations is correctly 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 of the following statements is true about 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 starts with 4 hydrogen atoms and 2 oxygen atoms, how many hydrogen and oxygen atoms should be present in the products to satisfy the Law of Conservation of Mass?

Accepted Answer

4 hydrogen atoms and 2 oxygen atoms

Question 8

Which of the following best explains why table salt (NaCl) is formed from sodium and chlorine?

Accepted Answer

Sodium donates an electron to chlorine, resulting in the formation of oppositely charged ions that attract each other.

Question 9

A student mixes a solution and observes that the pH is 9. What can be concluded about the solution?

Accepted Answer

It is basic (alkaline).

Question 10

Which of the following statements about the atomic number is correct?

Accepted Answer

The atomic number is determined by the number of protons in the nucleus.

Question 11

Which of the following is a real-world example of a covalent bond?

Accepted Answer

The bond between hydrogen and oxygen in a water molecule ($$H_2O)$$

Question 12

A chemist wants to neutralize a solution with a pH of 3. Which of the following would be the best approach?

Accepted Answer

Add a base to the solution until the pH reaches 7.

Question 13

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

Accepted Answer

Electrons are shared between two atoms.

Question 14

A solution turns universal indicator paper blue. What is the most likely pH range of this solution?

Accepted Answer

$$9-14$$

Question 15

Which of the following is true about the mass number of an atom?

Accepted Answer

It is the sum of the number of protons and neutrons in the nucleus.

Question 16

Which of the following best explains why water ($$H_2O) is a $$covalent compound?

Accepted Answer

It is formed by the sharing of electrons between hydrogen and oxygen, both of which are non-metals.

Question 17

A student is asked to balance the following equation: $$H_2$$ + $$O_2$$ \rightarrow H_2O$$. What is the correct set of coefficients to balance this equation?

Accepted Answer

$$2, 1, 2$$

Question 18

Which of the following is a property of acids according to the pH scale?

Accepted Answer

They have a pH less than 7.

Question 19

Which of the following best describes the electron configuration of a noble gas?

Accepted Answer

A full valence shell of electrons

Question 20

A patient is given a solution with a pH of 12 to neutralize stomach acid. What type of substance is this solution?

Accepted Answer

A strong base

Atomic Structure, Chemical Bonding, and Acids/Bases: Study Guide

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