Ks3 EOY Revision

Question 1

Chemical reaction

Answer 1

changes that only involve the positions of electrons in the forming and breaking of chemical bonds between atoms. Results in a new substance

Question 2

Physical changes

Answer 2

A change in state

Question 3

When is an alkali neutral as acid on the ph scale

Answer 3

Acid 1-6
Neutral 7
Alkali 8-14

Question 4

In an acid what colour is red litmus paper

Answer 4

Stays red

Question 5

In an acid what colour is blue litmus paper

Answer 5

Turns red

Question 6

In a neutral liquid what colour is red litmus paper

Answer 6

Stays red

Question 7

In a neutral liquid what colour is blue litmus paper

Answer 7

Stays blue

Question 8

In an alkali what colour is red litmus paper

Answer 8

Turns blue

Question 9

In an alkali what colour is blue litmus paper

Answer 9

Stays blue

Question 10

Electrons

Answer 10

Negatively charged particles that spin around the positive centre of the atom in circles called energy levels. Their mass is so small it is nearly zero

Question 11

Protons

Answer 11

Positively charged particles that are contained in the
nucleus
of the atom (the centre) they have a mass of 1 amu (atomic mass unit).

Question 12

Neutron

Answer 12

Particles with no charge that are also contained in the nucleus of the atom. They also have a mass of 1 amu.

Question 13

Three rock types

Answer 13

Igneous sedimentary metamorphic

Question 14

How are igneous rocks formed

Answer 14

Cooling of molten rock

Question 15

How are sedimentary rocks formed

Answer 15

small rock pieces being transported in rivers and laid down in layers

Question 16

How are metamorphic rocks formed

Answer 16

another rock under heat and pressure