Chemistry of the Environment
163 questions· page 1 of 17
Chlorine and carbon are both used in the treatment of the domestic water supply.
Which row describes one reason for the use of each substance?
Options
| chlorine | carbon | |
|---|---|---|
| A | causes the sedimentation of some solids | removes tastes from the water |
| B | causes the sedimentation of some solids | removes dissolved oxygen from the water |
| C | kills some microbes | removes tastes from the water |
| D | kills some microbes | removes dissolved oxygen from the water |
Which row states an adverse effect for the named pollutant?
Options
| air pollutant | adverse effect | |
|---|---|---|
| A | carbon dioxide | increases plant growth |
| B | methane | causes cancer |
| C | oxides of nitrogen | photochemical smog |
| D | particulates | acid rain |
Three statements about global warming and greenhouse gases are listed.
- Global warming is occurring because more of the Earth’s thermal energy is released to space.
- Greenhouse gases both absorb and emit thermal energy.
- Greenhouse gas levels in the atmosphere may be reduced by replacing fossil fuels with hydrogen.
Which statements are correct?
Options
A 1, 2 and 3
B 1 and 2 only
C 1 and 3 only
D 2 and 3 only
The domestic water supply is treated before it is supplied to houses. Three treatments are listed.
- sedimentation and filtration
- treatment with chlorine
- treatment with carbon
Which row shows the purpose of the treatments?
Options
| sedimentation and filtration | treatment with chlorine | treatment with carbon | |
|---|---|---|---|
| A | kills microbes | removes solids | removes unpleasant tastes and odours |
| B | removes solids | kills microbes | removes unpleasant tastes and odours |
| C | removes solids | removes unpleasant tastes and odours | kills microbes |
| D | removes unpleasant tastes and odours | kills microbes | removes solids |
Nitrates and ammonium salts are used as fertilisers.
Which fertiliser contains the greatest mass of nitrogen in of the compound?
[: H, 1; N, 14; O, 16; S, 32; Cl, 35.5; K, 39]
Options
A
B
C
D
Which strategy reduces methane emissions?
Options
A flue gas desulfurisation
B planting more trees
C reduction in livestock farming
D use of catalytic converters
Which substance is used to remove odours in the treatment of the domestic water supply?
Options
A carbon
B chlorine
C fluorine
D silver
Carbon dioxide, methane and oxygen are gases involved in the carbon cycle.
Which of these gases cause global warming?
Options
A carbon dioxide only
B carbon dioxide and methane
C carbon dioxide and oxygen
D methane only
Water may contain many substances before it is purified for drinking. Three substances are listed.
- dissolved oxygen
- harmful microbes
- insoluble solids
Which substances are removed by the treatment of the domestic water supply?
Options
A 1 and 2
B 1 and 3
C 2 and 3
D 3 only
Dry air is a mixture of gases. 99% of the mixture is nitrogen and oxygen.
What is in the highest abundance in the remaining 1%?
Options
A argon
B chlorine
C hydrogen
D water vapour