Summarize the provided solutions regarding demagnetization, hazardous substances, and animal breeding systems.

Here are the solutions to the questions:

Question 5

a) Magnetism:

• (i) What is demagnetization? Demagnetization is the process by which a magnet completely loses its magnetic properties, meaning it can no longer attract or repel magnetic materials.
• (ii) Three ways by which a magnet could be demagnetized:
  1. Heating the magnet to a high temperature (above its Curie point).
  2. Hammering or dropping repeatedly from a height.
  3. Placing the magnet inside a solenoid carrying alternating current (AC) and slowly withdrawing it.

b) Hazardous Substances:

• (i) What is a hazardous substance? A hazardous substance is any chemical or material that poses a significant risk to health, safety, property, or the environment due to its toxic, corrosive, flammable, or reactive nature.
• (ii) Examples:
  • (α) Corrosive household substance: Bleach (Sodium hypochlorite) / Hydrochloric acid (toilet bowl cleaner)
  • (β) Inflammable laboratory substance: Ethanol / Acetone
  • (γ) Toxic laboratory substance: Mercury / Potassium cyanide

c) Animal Breeding Systems:

• (i) Explanation of systems:
  • (α) Hand mating: A controlled breeding system where a female animal in heat is isolated and brought manually to a specific selected male for mating under close human supervision.
  • (β) Pasture mating: A natural breeding system where a selected male animal is left free to roam in the field/pasture with a herd of females to detect and mate with females in heat naturally.

Question 6

d) Environmental Issues:
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