$$\text{Mass number} = \text{Number of protons} + \text{Number of neutrons}$$

Question 1

Which of the following best describes the difference between mass and weight?

Accepted Answer

Mass is the amount of matter in a substance, while weight is the force of gravity acting on that mass.

Question 2

An element is defined as:

Accepted Answer

A substance that cannot be split into smaller substances by ordinary chemical means.

Question 3

If an atom has 8 protons, 8 neutrons, and 8 electrons, what is its atomic number and mass number?

Accepted Answer

Atomic number: 8, Mass number: 16

Question 4

Which equation correctly represents the calculation of mass number?

Accepted Answer

$$	ext{Mass number} = 	ext{Number of protons} + 	ext{Number of neutrons}$$

Question 5

Which of the following statements about isotopes is correct?

Accepted Answer

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

Question 6

Which four elements make up approximately 96% of the human body?

Accepted Answer

Oxygen, Carbon, Hydrogen, Nitrogen

Question 7

A neutral atom must have:

Accepted Answer

An equal number of protons and electrons.

Question 8

Which of the following best explains why weight changes on the Moon but mass does not?

Accepted Answer

Weight depends on gravity, which is weaker on the Moon, while mass is the amount of matter and remains constant.

Question 9

Which of the following is NOT a trace element in the human body?

Accepted Answer

Oxygen (O)

Question 10

Given the periodic table, which element is most abundant in the human body?

Accepted Answer

Oxygen (O)

Question 11

A patient’s blood test shows an abnormal ratio of protons to neutrons in their carbon atoms. What does this indicate?

Accepted Answer

The patient has a higher concentration of carbon isotopes.

Question 12

Which of the following is the smallest unit of an element that retains its chemical properties?

Accepted Answer

Atom

Question 13

If an atom has 17 protons, 18 neutrons, and 17 electrons, what is its mass number?

Accepted Answer

$$17 + 18 = 35$$

Question 14

Which of the following best describes the role of elements in the human body?

Accepted Answer

A small number of elements make up the majority of body mass.

Question 15

Which statement is true regarding the periodic table and human biology?

Accepted Answer

Most of the human body is composed of a few key elements, with many others present only in trace amounts.

Question 16

A scientist discovers a new atom with 10 protons, 10 neutrons, and 10 electrons. What is its atomic number and mass number?

Accepted Answer

Atomic number: 10, Mass number: 20

Question 17

Which of the following is a correct definition of a neutral element?

Accepted Answer

An element with equal numbers of protons and electrons.

Question 18

Which of the following is a correct statement about the number of elements on Earth?

Accepted Answer

There are 112 elements on Earth, including 92 natural and 20 synthetic elements.

Question 19

Which of the following is NOT a property of matter?

Accepted Answer

Can be split into smaller substances by ordinary means

Chemistry of Life: Basic Chemical Principles for Anatomy & Physiology

Guida di studio - Domande di pratica