Question 1

A neutral atom of sodium (Na) has an atomic number of 11 and an atomic mass of 23. How many neutrons does it have?

Accepted Answer

$$23 - 11 = 12$$ neutrons

Question 2

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

Accepted Answer

Oxygen has a stronger pull on electrons than hydrogen, creating a partial negative charge on the oxygen atom.

Question 3

Which type of bond is responsible for holding two water molecules together?

Accepted Answer

Hydrogen bond

Question 4

A solution is made by dissolving 10 g of salt in 100 mL of water. In this solution, which is the solvent?

Accepted Answer

Water

Question 5

Which of the following best describes a covalent bond?

Accepted Answer

A bond formed by the sharing of electrons between atoms.

Question 6

If an atom has 8 electrons, how are they distributed in the first and second energy levels?

Accepted Answer

2 in the first level, 6 in the second level

Question 7

Which of the following is a property of water that allows it to moderate temperature in living organisms?

Accepted Answer

High specific heat capacity

Question 8

A chemical equation is balanced when:

Accepted Answer

The number of atoms of each element is the same on both sides.

Question 9

Which of the following best describes an ion?

Accepted Answer

An atom that has gained or lost electrons, resulting in a net charge.

Question 10

Which of the following is an example of a compound?

Accepted Answer

NaCl

Question 11

What is the pH of a solution with a high concentration of H$$^+$$ ions?

Accepted Answer

pH close to 0

Question 12

Which of the following best explains why water is called a 'universal solvent'?

Accepted Answer

Water is highly polar and can dissolve many ionic and polar substances.

Basic Chemistry Concepts for General Chemistry

Study Guide - Practice Questions