Unit B - Section 1

Question 1

Change from solid to liquid is…

Answer 1

Melting point

Question 2

A change from liquid to gas is…

Answer 2

Evaporation

Question 3

A change from gas to liquid is…

Answer 3

Condensation

Question 4

A change from liquid to solid is…

Answer 4

Freezing point

Question 5

A solid can change directly into a gas is…

Answer 5

Sublimation

Question 6

A gas can change directly into a solid is…

Answer 6

Deposition

Question 7

What r properties?

Answer 7

Characteristics that can be used to describe a substance

Question 8

Physical properties can be used to…

Answer 8

Identity matter; examples r colour and lustre. The temperature at which a substance melts is also a physical property

Question 9

Its important to remember that…

Answer 9

When a substance undergoes a physical change, such as melting it’s appearance or state may be altered but it’s composition stays the same

Question 10

Melting point

Answer 10

The melting point of a substance is the temperature at which it changes from solid to a liquid

Question 11

Boiling point

Answer 11

The boiling point of a substance is the temperature at which it’s liquid phase changes to the gas phase

Question 12

Hardness

Answer 12

Hardness is a substance with the ability to resist being scratched

Question 13

Malleability

Answer 13

A substance that can be pounded or rolled into sheets is said to be malleable; such as gold and tin

Question 14

Ductibility

Answer 14

Any solid that can be stretched into a long wire is said to be ductile

Question 15

Crystal shape

Answer 15

The shape of a substances crystals can help identify it

Question 16

Solubility

Answer 16

Is the ability of a substance to be dissolved in another

Question 17

Density

Answer 17

Is the amount of mass in a given volume of a substance

Question 18

Conductivity

Answer 18

Is the ability of a substance to conduct electricity or heat

Question 19

Chemical properties

Answer 19

Reaction with acids
Ability to burn
Reaction with water
Behaviour in air
Reaction to heat

Question 20

Chemical property describes

Answer 20

How a substance interacts with other substances such as acids

Question 21

A chemical change

Answer 21

Results in the formation of a different substance or substances

Question 22

Pure substance

Answer 22

Made up of only one kind of matter and has a unique sets it apart from any other kind of matter

Question 23

Element

Answer 23

Material that cannot be broken down into any simpler substance

Question 24

Compound

Answer 24

When two or more elements combine chemically they form a compound

Question 25

Mixture

Answer 25

A combination of substances

Question 26

Mechanical mixture

Answer 26

The different substances that make up the mixture r visible

Question 27

Solution

Answer 27

The different substances that make it up r not separately visible

Question 28

Suspension

Answer 28

A cloudy mixture in which tiny particles of one substance r held within another

Question 29

Colloid

Answer 29

A cloudy mixture but the particles of the suspended substance r so small that they can’t be easily separated out of other substances

Question 30

Aqueous solution

Answer 30

Chemists call a substance dissolved in water an aqueous solution

Question 31

Physical properties

Answer 31

Colour
Lustre
Melting point
Boiling point
Hardness
Ductility
Malleability
Crystal shape
Solubility
Density
Conductivity