End of Years 25

Question 1

Acid + alkali

Answer 1

salt + water

Question 2

Acid + Metal oxide

Answer 2

salt + water

Question 3

Acid + metal

Answer 3

salt + hydrogen

Question 4

Acid + carbonate

Answer 4

salt + water + carbon dioxide

Question 5

Periodic Groups

Answer 5

• Alkali Metals (group 1)
• Alkaline earth metals
• other metals
  -Non-metals
• Halogens (group 7)
• Noble Gases (group 0)
• Transition gases
• Rare earth metals

Question 6

Group

Answer 6

Column

Question 7

Period

Answer 7

Row

Question 8

Atomic Mass

Answer 8

Mass of the atom

Question 9

Atomic Number

Answer 9

number of protons

Question 10

indigestion tablets

Answer 10

neutrilises acids

Question 11

Displacement reaction

Answer 11

when one element replaces another in a compound

Question 12

Neutrilisation reaction

Answer 12

acid reacts with a base or an alkali to form a salt and water.

Question 13

hazards

Answer 13

• Flammable
  -Compressed gas
  -Corrosive
  -oxidising
  -harmful
  -health hazard
  -toxic
  -explosive

Question 14

Reactivity Series

Answer 14

Potassium
sodium
Lithium
calcium
magnesium
aluminium
zinc
tin
lead
copper
mercury
silver
gold

Question 15

metal extraction

Answer 15

the process of obtaining pure metals from their ores

Question 16

reactants

Answer 16

the starting materials that combine

Question 17

products

Answer 17

the new substances formed after the reaction has taken place

Question 18

Chemical changes

Answer 18

a change of materials into another, new materials with different properties and one or more than one new substances are formed.

Question 19

Physical changes

Answer 19

the material involved in the change is structurally the same before and after the change. Types of some physical changes are texture, shape, temperature, and a change in the state of matter.