IGCSE Chemistry chapter 1&2

Word equation for photosynthesis?

• carbon + oxygen → carbon dioxide

• carbon dioxide + water → glucose + oxygen

• glucose + oxygen → carbon dioxide + water

Potentially renewable resources are?

• Minerals and fossil fuels

• Wind and tides

• Nuclear and solar energy

• Fresh water and soil

carbon + oxygen → carbon dioxide

This is an example of a word equation for which process?

• Respiration

• Photosynthesis

• Combustion

• Dissolving carbon in oxygen

Which gases contribute most significantly to

acid rain?

• carbon dioxide and methane

• carbon monoxide and unburnt hydrocarbons

• nitrogen oxides and sulfur dioxide

• lead and heavy metals

Which gases contribute most significantly to

global warming?

• carbon dioxide and methane

• carbon monoxide and unburnt hydrocarbons

• lead and heavy metals

• nitrogen oxides and sulfur dioxide

How does methane get into the air?

• Through respiration and burning processes

• By burning coal and oil

• During lightning

• By digestion processes of some animals

Why are light bulbs filled with argon?

• Because it is cheap

• Because it is inert

• Because it lights very well

• Because there is 20% of argon in the air

Why is it possible to separate the gases in the air by fractional distillation?

• Because they have different boiling points

• Because they have different colors

• Because they have different names

• Because they have different masses

Why is chlorine added to water?

• To remove floating rubbish

• To disinfect water

• To absorb chemicals

• To clear solid particles

What would be an ore?

• Kind of fossil fuel

• Rock+mineral

• Just a different name for a rock

• Center of the Earth