Chemistry

Question 1

1A non-biodegradable pollutant is

Easy

A. polyethene B. food waste C. cotton D. paper

Question 2

2Smoke from burning car tyres releases

Easy

A. toxic gases and particulates B. nitrogen only C. pure oxygen D. only water vapour

Question 3

3Carbon dioxide is a greenhouse gas.

Easy

A. True B. False

Question 4

4The excessive growth of algae due to fertiliser run-off is called ___.

Medium

Your answer (fill in the blank)

Question 5

5Methane is a more powerful greenhouse gas than carbon dioxide per molecule.

Hard

A. True B. False

Question 6

6Carbon monoxide is produced mainly by

Easy

A. incomplete combustion of fuels B. photosynthesis C. electrolysis D. respiration only

Question 7

7Biochemical oxygen demand (BOD) measures

Hard

A. the hardness of water B. the pH of water C. the oxygen used by microorganisms to break down organic matter in water D. the oxygen in air

Question 8

8Biodegradable waste can be broken down by microorganisms.

Easy

A. True B. False

Question 9

9Lead from old batteries can contaminate soil.

Easy

A. True B. False

Question 10

10Eutrophication is caused by

Medium

A. lack of nutrients B. excess nitrates and phosphates entering water bodies C. cold water D. too much oxygen