What does of a cmp machine does it represent? Name the following parts in the diagram. Name two examples of this machine.

The diagram shows a triangular shape with a block on top, which represents an inclined plane.

The class of simple machine is an:

• Inclined plane

b)

The parts of the inclined plane are not labeled in the provided image.

c)

Two examples of this machine are:

• Ramp
• Slide

Question 2:

a)

• (i) When a torch is switched on: Chemical energy changes to light energy.
• (ii) An orange falls from a tree: Gravitational potential energy changes to kinetic energy.

b)

• (i) Apparatuses used to measure mass: Beam balance and electronic balance.
• (ii) Apparatuses used to measure volume: Measuring cylinder and burette.

Question 3:

a)

Three physical properties of metals are:

• They are malleable (can be hammered into sheets).
• They are ductile (can be drawn into wires).
• They are good conductors of heat and electricity.

b)

It is difficult to separate iron filings and sulfur after heating because they undergo a chemical reaction to form a new compound, iron(II) sulfide. This new compound has different properties from the original elements and cannot be separated by simple physical methods.

Question 4:

a)

Two ways by which man's activities affect the national environment are:

• Deforestation, which leads to habitat destruction and soil erosion.
• Pollution (e.g., air pollution from industrial emissions, water pollution from improper waste disposal).

b)

The separation of iodine crystals and sand is achieved through sublimation. The mixture is heated gently, causing the solid iodine to turn directly into a gas. A cold surface (like an inverted funnel with ice on top) is placed over the mixture, where the iodine gas cools and re-sublimes back into solid crystals, leaving the sand behind in the original container.