Question 1

Which of the following best describes a hydrophobic molecule?

Accepted Answer

A molecule that avoids or does not make contact with water

Question 2

Which of the following is NOT considered matter?

Accepted Answer

Sunlight

Question 3

What determines the chemical behavior of an atom?

Accepted Answer

The arrangement of electrons in the outer shell

Question 4

Which subatomic particle is responsible for determining the element of an atom?

Accepted Answer

Proton

Question 5

A neutral atom of carbon has 6 protons. How many electrons does it have?

Accepted Answer

6

Question 6

Which of the following statements about electrons is TRUE?

Accepted Answer

Electrons have a negative charge and participate in chemical reactions

Question 7

What is the main difference between isotopes of the same element?

Accepted Answer

They have different numbers of neutrons

Question 8

Which of the following is a real-life example of a hydrophilic substance?

Accepted Answer

Table salt (NaCl)

Question 9

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

Accepted Answer

$$8$$

Question 10

Which of the following best explains why electrons are important in chemical reactions?

Accepted Answer

They are found in the outer shell and interact with other atoms

Question 11

Which of the following is a property of a proton?

Accepted Answer

Positive charge

Question 12

A scientist discovers a new atom with 15 protons, 16 neutrons, and 15 electrons. What is the mass number of this atom?

Accepted Answer

$$31$$

Question 13

Which of the following best describes the nucleus of an atom?

Accepted Answer

It contains protons and neutrons

Question 14

Which of the following is NOT a state of matter?

Accepted Answer

Energy

Question 15

Which of the following best explains why oil and water do not mix?

Accepted Answer

Oil is hydrophobic and does not interact with water

Question 16

Which of the following particles is found in the nucleus and has no charge?

Accepted Answer

Neutron

Question 17

A student mixes salt into water and observes that it dissolves completely. What property of salt allows this to happen?

Accepted Answer

Salt is hydrophilic

Question 18

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

Accepted Answer

Atom

Question 19

Which of the following best describes the role of neutrons in an atom?

Accepted Answer

They determine the isotope of the element

Question 20

Which of the following is a correct statement about the relationship between protons, neutrons, and electrons in a neutral atom?

Accepted Answer

The number of protons equals the number of electrons

Basic Chemistry and Atomic Structure for Biology

Study Guide - Practice Questions