Question 1

Which of the following best describes matter?

Accepted Answer

Anything that occupies space and has mass

Question 2

Which of the following is an example of a physical change?

Accepted Answer

Melting ice into water

Question 3

Which form of energy is directly involved in moving matter?

Accepted Answer

Mechanical energy

Question 4

ATP (adenosine triphosphate) is important in the body because:

Accepted Answer

It traps the chemical energy of food in its bonds

Question 5

Which four elements make up about 96% of the human body’s mass?

Accepted Answer

Oxygen, Carbon, Hydrogen, Nitrogen

Question 6

Which subatomic particle is responsible for the chemical behavior and bonding properties of an atom?

Accepted Answer

Electron

Question 7

An atom with 11 protons, 12 neutrons, and 11 electrons has an atomic number of:

Accepted Answer

$$11$$

Question 8

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes have the same number of protons but different numbers of neutrons

Question 9

What type of bond is formed when electrons are completely transferred from one atom to another?

Accepted Answer

Ionic bond

Question 10

Which of the following best describes a molecule?

Accepted Answer

Two or more atoms of the same element combined chemically

Question 11

If an atom has a full valence shell, it will:

Accepted Answer

Be chemically inert

Question 12

Which of the following is a correct example of a chemical reaction resulting in a compound?

Accepted Answer

$$4H + C \rightarrow CH_4$

Question 13

Which of the following is true about ions?

Accepted Answer

Anions have a negative charge due to gaining electrons

Question 14

Which of the following best explains why sodium (Na) and chlorine (Cl) form an ionic bond?

Accepted Answer

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

Question 15

Which of the following is NOT a property of water that makes it vital to the body?

Accepted Answer

It is a good conductor of electricity

Question 16

A solution with a pH of 4 is:

Accepted Answer

Acidic

Question 17

Which of the following best describes the difference between a molecule and a compound?

Accepted Answer

A molecule is formed from atoms of the same element, while a compound is formed from atoms of different elements

Question 18

Which of the following is a correct statement about the planetary model of the atom?

Accepted Answer

Protons and neutrons are located in the nucleus, and electrons orbit around the nucleus

Question 19

Which of the following is a real-life application of radioisotopes in medicine?

Accepted Answer

Tagging and tracing biological molecules through the body

Question 20

If an atom has 8 electrons in its outermost shell, it will:

Accepted Answer

Be chemically stable and inert

Chapter 2: Basic Chemistry – Essentials of Human Anatomy & Physiology

Study Guide - Practice Questions