(i)

Electrical circuit diagram

(ii)

D → Copper wire/conducting wire/connecting wire E → Cell K → Switch/Key P → Resistor/Load

(iii)

Functions of D (Copper wire)

1. To conduct electric current/electricity
2. To connect components of an electrical circuit

Functions of E (Cell)

1. To produce electricity
2. Source of electric current/electric charge
3. Converts chemical energy into electrical energy

Function of K (Switch/Key)

To allow electric current to flow through the circuit depending on whether it is closed or opened

Functions of P (Resistor/Load)

1. To convert electrical energy to other forms of energy
2. To opposre the flow of current through the circuit

(iv)

Energy transformation in electric circuit

Chemical energy is converted into electrical energy.

OR

Chemical energy → Electrical energy

(i)

(ii)

Calcium hydroxide and dilute hydrochloric acid

(iii)

Ca(OH)₂ + 2HCl → CaCl₂ + 2H₂O

(i)

I → Tongue/salivary gland
II → Oesophagus/gullet
III → Stomach
IV → Liver

(ii)

V → Stores bile
VI → Produces enzymes/pancreatic juice

(iii)

Digestion of protein starts at part III (stomach)

(iv)

(i)

A pair of secateurs

(ii)

Uses of secateurs

1. For cutting
2. For trimming
3. For pruning

(iii)

Ways of maintaining the secateurs

1. Greasing/oiling/lubricating metal parts to prevent rusting
2. Cleaning/washing and drying after use
3. Sharpening cutting edges when blunt
4. Repairing/mending broken parts
5. The tool/secateurs should be used for the intended job
6. Tightening loose bolts and nuts
7. Storing tool in cool dry places or tool box

i)

The two elements that combines to form ammonia gas

1. Nitrogen
2. Hydrogen

ii)

Balanced chemical equation for the formation of ammonia

N₂ + 3H₂ → 2NH₃

i)

Galaxy is a group of stars.

OR

Galaxy is a system of stars,gases,dust/dark matter held together in the heavens/space.

OR

Galaxy is a collection of billions of stars that show a common gravitational link.

ii)

Relationship between stars and galaxies

Galaxies are held together by gravitational attraction much like a solar system while stars in the solar systems combine to form galaxies

OR

Stars makes up the galaxies

OR

Galaxies are made up of several billions of Stars

iii)

Milky way is the galaxy that contains the solar system and the earth.

OR

Milky way is a hazy band of light seen in the night sky formed from stars that cannot be individually distinguished by the naked eye.

i)

An acid is a proton donor

OR

An acid is a substance/compound that produces excess hydrogen ion (H⁺) in water.

An acid is a substance that contains replaceable hydrogen.

ii)

Differences between an acide and a base

i)

Pressure is force per unit area or the force acting (normally) per unit area

OR

Pressure = $\frac{\mathrm{(Normal)\; Force}}{\mathrm{Area}}$

ii)

Force = 200 N

Area = 50 m²

Pressure = $\frac{200}{50}$

Pressure = 4 Nm^-2 or 4 Pa

i)

Unicellular is a living organism that consists of only once cell.

ii)

Multicellular, living organisms that consist of many cells.

(i)

A satellite is an object which moves around a planet in space

(ii)

Differences between a natural and an artificial satellite

(iii)

Uses of artificial satellites

1. For exploring the planets/moons
2. For scientific research/experimental research/internet
3. To study the universe
4. For communications/broadcasting/telephone call
5. For weather forecast/collecting information on the weather
6. Map making
7. Spying
8. For navigation/satellite for navigation
9. Military purposes

(i)

Calcium oxide → CaO

(ii)

Water → H₂O

(iii)

Copper sulphate → CuSO₄

(i)

Breathing is the process by which animals take in oxygen and give out carbon dioxide through their lungs/respiratory organs.

(ii)

The human being respiratory system in order in which air from the atmosphere passes through them during breathing

Nostrils → Trachea → Bronchus → Lungs

(iii)

Digestion of a piece of bread when it reaches the duodenum of a human being

1. When the bread gets into the duodenum, the pancreas produces a liquid called pancreatic juice
2. The pancreatic juice contains an enzyme called amylase which breaks down the bread (carbohydrate) into complex sugar (maltose)

(i)

L → Live
N → Neutral
E → Earth

(ii)

Function of the fuse box in household electrical wiring

1. It contains fuses/thin wires which melt and cut off current when the current passing through is too large

2. It protects the appliances/electrical circuit

(i)

The gas which is used in both rusting and burning is oxygen

(ii)

Ways in which rusting can be prevented in everyday life

1. Painting
2. Galvanizing (electroplating)
3. Greasing
4. Oiling
5. Alloying

(i)

Green grass → grasshopper → bird

OR

Green grass → goat → man

(ii)

Diseases that can be controlled by immunization

1. Tuberculosis
2. Measles
3. Poliomyelitis
4. Whooping cough
5. Diphtheria
6. Tetanus
7. Yellow fever
8. Cholera

(i)

Potential energy → Kinetic energy → Sound energy → Heat energy

(ii)

Appliances which use electromagnets in their operation

1. Telephone receivers
2. Loudspeakers
3. Electric bells
4. Burglar alarms
5. Microphones

(iii)

Ways in which a magnet can lose its magnetism

1. Heating the magnet in fire
2. Striking the magnet continuously with a hammer
3. Placing it in a solenoid through which an alternating current flows