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 mixes hydrochloric acid (pH = 1) with sodium hydroxide (pH = 13). What is the expected pH of the resulting solution if they are mixed in equal amounts and completely neutralize each other?

Accepted Answer

$$pH = 7$$

Question 3

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 4

An element has 11 protons and 12 neutrons. What is its atomic number and mass number?

Accepted Answer

Atomic number: 11, Mass number: 23

Question 5

Why are noble gases generally unreactive?

Accepted Answer

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

Question 6

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

Accepted Answer

Sodium ($$Na) $$and Chlorine ($$Cl)$$

Question 7

A solution turns blue when tested with universal indicator. What can you infer about its pH and chemical nature?

Accepted Answer

It has a pH greater than 7 and is basic.

Question 8

Which of the following best explains why table salt ($$NaCl) is $$solid at room temperature?

Accepted Answer

It is held together by strong ionic bonds between oppositely charged ions.

Question 9

Which of the following is a correct statement about the pH scale?

Accepted Answer

A pH of 2 indicates a strong acid.

Question 10

Which of the following best describes the electron arrangement in a water molecule ($$H_2O$$)?

Accepted Answer

Electrons are shared between hydrogen and oxygen atoms.

Question 11

A chemist wants to balance the following equation: $$C + O_2$ \rightarrow CO_2$. Which coefficient should be placed in front of CO_2$ to balance the equation?

Accepted Answer

1

Question 12

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

Accepted Answer

The bond between hydrogen and oxygen in a water molecule.

Question 13

If a solution has a pH of 9, which of the following statements is true?

Accepted Answer

The solution is basic.

Question 14

Which of the following best explains why sodium ($$Na) is $$highly reactive?

Accepted Answer

It has one electron in its outermost shell, which it readily loses to achieve stability.

Question 15

Which of the following is the correct mass number for an atom with 17 protons and 18 neutrons?

Accepted Answer

$$35$$

Question 16

A student claims that all acids have a pH greater than 7. Is this statement correct? Why or why not?

Accepted Answer

No, because acids have a pH less than 7.

Question 17

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

Accepted Answer

It has a full valence shell.

Question 18

Which of the following is a correct application of the Law of Conservation of Mass?

Accepted Answer

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

Question 19

Which of the following best explains why $$H_2O is a $$molecule but $$NaCl is $$not?

Accepted Answer

$$H_2O is $$held together by covalent bonds, forming discrete molecules, while $$NaCl$$ forms a lattice of ions.

Question 20

Which of the following best describes what happens when sodium reacts with chlorine to form table salt?

Accepted Answer

Sodium transfers an electron to chlorine, forming $$Na^+$$ and $$Cl^-$$ ions.

Atomic Structure, Bonding, and Chemical Properties: Study Guide

Study Guide - Practice Questions

Study Guide - Flashcards