Question 1

Which of the following statements best describes a compound?

Accepted Answer

A substance consisting of different elements in fixed ratios, with distinct properties from its components.

Question 2

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

Accepted Answer

Atom

Question 3

Which part of the atom is described as 'mostly empty space'?

Accepted Answer

Electron cloud

Question 4

If an atom has 6 protons, 6 neutrons, and 6 electrons, what is its atomic number?

Accepted Answer

$6$

Question 5

Which subatomic particle has a negative charge and negligible mass?

Accepted Answer

Electron

Question 6

Which of the following best explains why compounds have properties different from their constituent elements?

Accepted Answer

Compounds are formed by chemical reactions that create new substances with distinct properties.

Question 7

What is the charge and relative mass of a neutron?

Accepted Answer

No charge, unit mass

Question 8

Which of the following is NOT a characteristic of elements?

Accepted Answer

They can be broken down into simpler substances by chemical reactions.

Question 9

A sample contains only one type of atom. What type of substance is this?

Accepted Answer

Element

Question 10

Which equation correctly represents the relationship between atomic number $(Z)$, number of protons $(p)$, and number of neutrons $(n)$ in an atom?

Accepted Answer

$Z = p$

Question 11

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

Accepted Answer

Contains protons and neutrons and is extremely dense.

Question 12

Which of the following is a real-world example of a compound?

Accepted Answer

Sodium chloride $(NaCl)$

Question 13

If a neutral atom has 17 protons, how many electrons does it have?

Accepted Answer

$17$

Question 14

Which statement is true about the electron cloud?

Accepted Answer

It contains electrons and is mostly empty space.

Question 15

Which of the following is NOT a subatomic particle?

Accepted Answer

Molecule

Question 16

Which property is shared by all elements?

Accepted Answer

They have a unique chemical symbol.

Question 17

Which of the following best explains why the electron cloud is considered 'mostly empty space'?

Accepted Answer

The volume of the electron cloud is much larger than the nucleus, but electrons themselves occupy very little space.

Question 18

Which of the following is true about compounds?

Accepted Answer

They can be separated into their elements by chemical reactions.

Question 19

Which subatomic particle determines the identity of an element?

Accepted Answer

Proton

Question 20

Which of the following best describes matter?

Accepted Answer

Anything that has mass and volume.

Introduction to Chemistry and Atomic Structure: Study Notes for General Biology

Study Guide - Practice Questions