Explain the differences between dust and dirt, factors in dirt removal, and how lemon removes tarnish.

Here's the breakdown for question 5:

a) Two differences between dust and dirt:

Dust	Dirt
Consists of fine, dry particles that are often airborne.	Consists of larger, heavier particles that are typically soil-based or grime.
Primarily composed of dead skin cells, textile fibers, pollen, and environmental particles.	Primarily composed of soil, mud, food residues, or other sticky substances.

b) Three factors that will determine the method to be used for dirt removal are:

• The type of dirt (e.g., loose dust, sticky grease, mud, rust).
• The surface material from which the dirt is to be removed (e.g., wood, metal, fabric, glass).
• The amount or extent of the dirt (e.g., a light layer vs. heavy accumulation).

c) Lemon is used to remove tarnish on a kitchen sink because it contains citric acid. This acid reacts chemically with the metal oxides that form the tarnish, dissolving them. After applying lemon juice and letting it sit briefly, the loosened tarnish can be easily wiped away, revealing the clean surface underneath.