Chemistry

Question 1

Chemical Properties

Answer 1

properties that describe how a substance combines with other substances to form new chemicals or how a substance breaks up into two or more different substances.

Question 2

Physical Properties

Answer 2

properties that describe how a substance combines with other substances to form new chemicals or how a substance breaks up into two or more different substances.

Question 3

Chemical Change

Answer 3

The process of a new substance being formed.

Question 4

Physical change

Answer 4

Change in which no new chemical substances are formed.

Question 5

Evaporates

Answer 5

Change state from a solid to a gas. Evaporation only occurs from the surface of a liquid.

Question 6

State

Answer 6

Condition or phase of a substance. The three main states of matter are solid, liquid and gas.

Question 7

Chemical Reaction

Answer 7

a chemical change in which one or more new chemical substances are produced.

Question 8

Reactant

Answer 8

chemical substance used up in a chemical reaction. Some chemical bonds in a reactant are broken during the reaction.

Question 9

Products

Answer 9

new chemical substance that results from a chemical reaction.

Question 10

Precipitate

Answer 10

solid product of a chemical reaction that does not dissolve in water.

Question 11

Reaction Rate

Answer 11

Speed at which a reaction takes place.

Question 12

Catalyst

Answer 12

chemical that helps to start or speed up a chemical reaction.

Question 13

Enzymes

Answer 13

special chemicals that speed up reactions but are themselves not used up in the reaction.

Question 14

Rusting

Answer 14

A brown substance formed when iron reacts with oxygen and water.

Question 15

Corrosion

Answer 15

a chemical reaction that wears away a metal. Air, water or chemicals in air and water, as well as many household substances, can be corrosive. Many acids and other corrosive substances are dangerous.

Question 16

Surface protection

Answer 16

coating over a metal surface to prevent corrosion.

Question 17

Galvanising

Answer 17

protecting a metal by covering it with a more reactive metal that will corrode first.

Question 18

Plastic

Answer 18

Synthetic substance capable of being moulded.

Question 19

Natural fibres

Answer 19

fibres that form naturally; that is, they have not been made by humans. Natural fibres include wool and silk from animals and cotton from plants.

Question 20

Nylon

Answer 20

synthetic fibre. The monomers are joined by the elimination of water molecules at the joins.

Question 21

Polyester

Answer 21

synthetic fibre. The monomers are joined by the elimination of water molecules at the joins.

Question 22

Spinneret

Answer 22

device like a nozzle with small holes through which a plastic material passes, forming threads.

Question 23

Durability

Answer 23

the quality of lasting, not easily being worn out.

Question 24

Elastic

Answer 24

describes a material that is able to return to its original size after being stretched.

Question 25

Elastic

Answer 25

describes a material that is able to return to its original size after being stretched.

Question 26

Biodegradeble

Answer 26

describes a substance that breaks down or decomposes easily in the environment.

Question 27

Organisms

Answer 27

Living things