PART II
3. (a) (i) What is a mixture?
A mixture is a physical combination of two or more substances.
(ii) Explain why some mixtures are thoroughly stirred before they are used.
To attain a uniform mixture or to make it homogeneous, since the original mixture may not be uniform or there may be some suspended particles of the solute.
(b) (i) What is reflection of light?
The bouncing back or redirection of light when it strikes a surface.
(ii) State two characteristics of the images formed by plane mirrors.
- Same size as object
- Same distance from mirror as object
- Virtual
- Erect / upright
- Laterally inverted [any two]
(c) (i) What is a fertilizer?
Any substance usually added to or spread onto soil to increase its ability to support plant growth.
OR: A substance added to soil to increase its nutrient content or fertility
(ii) Give one example of an inorganic fertilizer.
NPK or ammonium sulphate or urea or potassium chloride (or muriate of potash)
(d) (i) What is indiscriminate sex?
Having sexual intercourse with multiple (two or more) partners and usually without protection (use of condom)
(ii) State two dangers of indiscriminate sex on humans.
- Contracting sexually transmitted diseases (STDs), such as AIDS, syphilis, etc.
- Teenage pregnancy (where teenagers are involved).
- Abortion, which is usually quite dangerous to the mother.
- Loss of social respect / reputation
- Loss of self-esteem. [any one]