Ch.8 Chemcial Change

Question 1

Physical Properties

Answer 1

The properties that you can observe or measure directly by using all of your 5 senses - Seeing, Hearing, Smelling, Touching and Tasting

Question 2

Chemical Properties

Answer 2

The properties used to describe a substance combines with another substance to form a new chemical or how a substance breaks up into 2 or more substances

Question 3

Flammability

Answer 3

A indicator of how easily a substance catches fire

Question 4

Reactivity

Answer 4

The measure of how likely a particular metal is to take part in a displacement reaction

Question 5

Toxicity

Answer 5

The danger to your health caused when poisonous substances combine with chemicals in your body to produce new substances and damaging effects

Question 6

Reaction Time

Answer 6

The speed at which a reaction takes place

Question 7

Catalyst

Answer 7

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

Question 8

Enzymes

Answer 8

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

Question 9

Rusting

Answer 9

A brown substance formed when iron reacts with oxygen and water

Question 10

Corrosion

Answer 10

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 11

Surface Protection

Answer 11

coating over a metal surface to prevent corrosion

Question 12

Galvanising

Answer 12

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

Question 13

Burning

Answer 13

Combining a substance such as flint with oxygen in a flame

Question 14

Oxidation

Answer 14

The chemical reaction involving the loss of electrons by a substance

Question 15

Fossil Fuel

Answer 15

Any remains, impression, or trace of an animal or plant of a former geological age; evidence of life in the past

Question 16

Combustion

Answer 16

The process of combining with oxygen, most commonly burning with a flame

Question 17

Plastics

Answer 17

The synthetic substance capable of being moulded

Question 18

Natural Fibres

Answer 18

The 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 19

Nylon

Answer 19

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

Question 20

Polyester

Answer 20

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

Question 21

Spinnerets

Answer 21

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

Question 22

Durability

Answer 22

The quality of lasting, not easily being worn out

Question 23

Elastic

Answer 23

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

Question 24

Biodegradable

Answer 24

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

Question 25

Organisms

Answer 25

Living Things