CHEMISTRY | Lessons 1-3 | The Atom (Grade 9 review)

Question 1

Definition of:
Matter

Answer 1

Anything that has mass and takes up space

Question 2

True or False:
Chemicals are found in all the matter around you

Answer 2

True

Question 3

What are the three states a substance can be in?

Answer 3

• Solid
• Liquid
• Gas

Question 4

Characteristics of:
A solid

Answer 4

• Definite shape
• Definite volume

Question 5

Characteristics of:
A liquid

Answer 5

• Non-definite shape
• Definite volume

Question 6

Characteristics of:
A gas

Answer 6

• Non-definite shape
• Non-definite volume

Question 7

Definition of:
Physical Property

Answer 7

A characteristic of a substance that does NOT produce a new substance.

Question 8

Examples of:
Physical Property

Answer 8

• Size
• Shape
• Color
• Texture
• Melting/freezing point
• Conductivity

Question 9

Definition of:
Chemical Property

Answer 9

A characteristic of a substance that can be observed in a chemical reaction.

Question 10

Examples of:
Chemical Property

Answer 10

• Flammability
• Toxicity
• Solubility
• Radioactivity
• Ability to rust or corrode

Question 11

Definition of:
Physical Change

Answer 11

Changes a physical property of matter but NOT a chemical property

Question 12

Definition of:
Chemical Change

Answer 12

Changes a Chemical property of matter

Question 13

What are the 5 ways to identify a chemical change?

Answer 13

1. The production of a new substance
2. Color change
3. Odor change
4. A gas is produced
5. Change of temperature

Question 14

Definition of:
Pure Substance

Answer 14

Substances that are made up of only one kind of particle and have a fixed or constant structure.

Question 15

True or False:
A pure substance can be an element or a compound

Answer 15

True

Question 16

Definition of:
Element

Answer 16

A pure substance that can’t be broken down

Question 17

Definition of:
Compound

Answer 17

A pure substance made of 2 or more elements (can be broken down)

Question 18

How can a substance be identified?

Answer 18

• Smell
• Taste
• Appearance
• Etc

Question 19

Definition of:
Mixture

Answer 19

A combination of 2 or more pure substances

Question 20

Definition of:
Mechanical/Heterogeneous Mixture

Answer 20

A mixture that does not have the same composition throughout (different substances are visible)

Question 21

Definition of:
Homogeneous Mixture

Answer 21

A mixture that has the same composition throughout (different substances are NOT visible)

Question 22

What are the three subatomic particles?

Answer 22

• Protons
• Neutrons
• Electrons

Question 23

Definition of:
Protons

Answer 23

Positively charged particles located in the nucleus of an atom

Question 24

Definition of:
Neutrons

Answer 24

Electrically neutral particles located in the nucleus of an atom

Question 25

Definition of: Electrons

Answer 25

Negatively charged particles that surround the nucleus of an atom (in energy levels)

Question 26

What did Dalton contribute to the discovery of the atom?

Answer 26

Discovered that everything is made up of small particles (atoms)

Question 27

What did Thomson contribute to the discovery of the atom?

Answer 27

Discovered the electron

Question 28

What did Rutherford contribute to the discovery of the atom?

Answer 28

Discovered the atomic structure

Question 29

What did Bohr contribute to the discovery of the atom?

Answer 29

Discovered that electrons rotate in fixed orbits around the nucleus

Question 30

What does the atomic number on a Bohr diagram represent?

Answer 30

The amount of protons in an atom

Question 31

True or False: In a neutral atom, the number of protons and electrons are different.

Answer 31

False: In a neutral atom, the number of protons and electrons are the same

Question 32

Definition of: Isotopes

Answer 32

Atoms of the same element that contain different amounts of neutrons

Question 33

Definition of: Atomic molar mass

Answer 33

The average mass of an elements isotopes

Question 34

Definition of: Mass number

Answer 34

The sum of all the protons and neutrons in an atom