Chemistry of the environment — IGCSE Chemistry (0971) questions by topic
Chemistry of the environment questions cover pollution and water treatment: identifying the equation for removing an acid-rain-forming gas using a catalytic converter, matching stages in domestic water treatment to their reasons, identifying which pollutants contribute to acid rain, and working out which statements about carbon dioxide's role in warming are correct. State, identify, describe, explain and draw cover both equation recognition and matching-based reasoning about environmental processes.
10 questions from 2025 papers make up this set, worth between 1 and 8 marks. Because matching-type questions here pair a treatment stage with its specific reason, submitting an answer for instant marking checks whether a stage, such as adding carbon or a settling step, has been linked to the correct reason rather than a plausible but mismatched one.
May–June 2025, Paper 11
Fertilisers are used to provide the three elements needed for improved plant growth. Which two compounds would provide all three of these elements? A ammonium nitrate and calcium…
Answer this question and get it marked →May–June 2025, Paper 12
Sulfur dioxide, carbon monoxide and oxides of nitrogen are gaseous pollutants found in the air. Which pollutants contribute to acid rain? A carbon monoxide and sulfur dioxide B…
Answer this question and get it marked →May–June 2025, Paper 21
Nitrogen, phosphorus and potassium are essential elements for improved plant growth. Which mixture provides all three essential elements? The options give a mixture and its…
Answer this question and get it marked →Which statements help explain why an increasing amount of carbon dioxide or methane in the atmosphere causes global warming? 1 Carbon dioxide absorbs thermal energy from the…
Answer this question and get it marked →The exhaust gases from cars contain oxides of nitrogen. How are these oxides of nitrogen formed? A Nitrogen and oxygen from the air react together at the high temperatures in the…
Answer this question and get it marked →May–June 2025, Paper 22
Gases which cause acid rain form in car engines. These gases can be removed using a catalytic converter. Which equation represents the removal of one of these gases using a…
Answer this question and get it marked →Which statements about carbon dioxide are correct? 1 Carbon dioxide absorbs thermal energy from the Earth. 2 Carbon dioxide increases the thermal energy loss to space. 3 The level…
Answer this question and get it marked →May–June 2025, Paper 31
This question is about water and air. River water needs to be treated to make it safe to drink. Two of the stages used in the treatment of domestic water are the addition of…
Answer this question and get it marked →May–June 2025, Paper 32
This question is about water and air. Water needs to be treated to make it safe to drink. Draw a line from each stage in the treatment of domestic water to the reason why it is…
Answer this question and get it marked →May–June 2025, Paper 42
Using numbers only, state the percentage of nitrogen in clean, dry air.
Answer this question and get it marked →