Ch. 3 Matter- Properties And Change

Question 1

Matter

Answer 1

Is anything with mass and volume

Question 2

Substance

Answer 2

Is a form of matter with a uniform and unchanging composition

They also have specific numbers changing PROPERTIES that can be observed

They have both physical and chemical properties

Question 3

Physical properties

Answer 3

Can be observed without changing a substances chemical composition

Ex: are color, hardness, and density

Question 4

Chemical properties

Answer 4

Can’t be observed without changing the composition of a substance

Ex: is the tendency of iron to form rust when exposed to air

Question 5

Ex of physical properties

Answer 5

1. Chemical formula H2O
2. Colorless
3. Solid at normal temperatures and pressures
4. Melting point
5. Conducts electricity

Question 6

Chemical properties

Answer 6

1. Forms green carbonate when exposed to moist air
2. Remains unchanged when in the presence of nitrogen
3. Ability to combine with another substance

Question 7

True or false ?

All matter that we encounter in everyday life exist in one of three physical forms

Answer 7

True

Question 8

True or false ?

A solid has definite shape and volume

Answer 8

True

Question 9

True or false ?

A liquid has a definite shape takes on the volume of its container

Answer 9

False

Question 10

True or false ?

A gas has both the shape and the volume of its container

Answer 10

True

Question 11

True or false ?

The particles in a gas can’t be compressed into a smaller volume

Answer 11

False

Question 12

True or false ?

Liquids tend to contract when heated

Answer 12

False

Question 13

True or false ?

The particles In a solid are spaced far apart

Answer 13

False

Question 14

True or false ?

The words gas and vapor can be used interchangeably

Answer 14

False

Question 15

Physical changes include :

Answer 15

1. Boil
2. Freeze
3. Condense
4. Vaporize
5. Melt

Question 16

Chemical changes include :

Answer 16

1. Explode
2. Rust
3. Oxidize
4. Burn
5. Rot

Question 17

Chemical change

Answer 17

A chemical reaction that involves one or more substances changing into new substances

Question 18

Reactants

Answer 18

The starting substances in a chemical reaction

Question 19

Products

Answer 19

The new substances that are formed in a chemical reaction

Question 20

Chemical equation

Answer 20

Shows the relationship between the reactants and products in a chemical reaction

Question 21

Law of conservation of mass

Answer 21

States that mass is neither created nor destroyed in any process

Question 22

Filtration

Answer 22

Separates solids from liquids by using porous barrier

Question 23

Distillation

Answer 23

Separates substances on the basis of the boiling points of the substances

Question 24

Crystallization

Answer 24

Separates by formation of solid, pure particles from a solution

Question 25

Chromatography

Answer 25

Separates substances based on their movement through a special paper

Question 26

Element

Answer 26

A substance that can't be separated into simpler substances by physical or chemical means

Question 27

Compound

Answer 27

A chemical combination of two or more different elements

Question 28

Ex of an element

Answer 28

Is oxygen

Question 29

Ex of a compound

Answer 29

Aspirin

Question 30

Periods

Answer 30

Horizontal rows in the periodic table

Question 31

Groups or families

Answer 31

Vertical columns in a periodic table

Question 32

Ex of elements

Answer 32

1. Silicon 2. Francium 3. Nickel

Question 33

Ex of a compound

Answer 33

1. Sodium chloride | 2. Ice