Chemistry of the environment — IGCSE Chemistry (0620) questions by topic

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…

What is produced by the incomplete combustion of methane? A carbon monoxide B hydrogen C lead compounds D sulfur dioxide

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…

Farmers use fertilisers to replace elements in the soil that have been removed by the crops they grow. Which elements in the soil are replaced by adding fertilisers? A Ca, P, O B…

Nitrogen, phosphorus and potassium are essential elements for improved plant growth. Which mixture provides all three essential elements? mixture formulae --- --- --- A ammonium…

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…

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…

A sample of water taken from a river contains harmful microbes. What is a source of harmful microbes in the river water? A sewage B fertilisers C detergents D plastics

Which gas contributes to increased global warming? A argon B carbon dioxide C nitrogen D oxygen

Which statement describes how greenhouse gases increase global warming? A Greenhouse gases absorb thermal energy from the Sun, reducing the Earth's temperature. B Greenhouse gases…

Nitrogen monoxide is produced in a car engine when petrol is burned. The gases from the car engine are passed through a catalytic converter. In the catalytic converter, the…

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…

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…

This question is about air and water. Water needs to be treated to make it safe to drink. Complete Fig. 7.1 to show the three stages needed in the treatment of domestic water. The…

A farmer treats a field with calcium hydroxide to make it less acidic. When the farmer adds ammonium nitrate fertiliser to the field immediately after the calcium hydroxide, the…

Which reaction produces carbon dioxide? A cracking of large hydrocarbon molecules B photosynthesis C reaction of a base with a carbonate D thermal decomposition of calcium…

A sample of air containing four gases only is analysed. 99.0% of the sample contains the two main gases in the same percentages as in clean, dry air. The remaining 1.0% of the…

Which substance contains two elements that are found in NPK fertilisers? A ammonium chloride B calcium hydroxide C potassium nitrate D sodium phosphate

Which statement about sulfur is correct? A When sulfur is burned, it produces a substance that causes acid rain. B Sulfur is produced by the thermal decomposition of limestone. C…

What are two adverse effects of particulates in the air? 1 acid rain 2 cancer 3 photochemical smog 4 respiratory problems A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

Which compound can be added to ammonium sulfate to make an NPK fertiliser? A (NH4)3PO4 B KNO3 C K3PO4 D CO(NH2)2

Four gases found in air are listed: 1 carbon dioxide 2 carbon monoxide 3 methane 4 sulfur dioxide Which gases lead directly to global warming when their concentrations are…

Water is extracted from a river for use in a domestic water supply. Some treatments for domestic water are listed: chlorination; sedimentation and filtration; treatment with…

A farmer knows his soil needs phosphorus and potassium. He has a choice of four fertilisers: 1 NH4NO3 2 (NH4)3PO4 3 KNO3 4 (NH2)2CO Which fertilisers should he use? A 1 and 2 B 1…

Which strategies are useful in reducing the production of acid rain? 1 planting trees 2 using catalytic converters in motor vehicles 3 reducing livestock farming 4 using…

Which row shows the conditions used for the conversion of sulfur dioxide to sulfur trioxide in the Contact process? (columns: pressure / atm; temperature / °C; catalyst) A 250;…

Which pollutant leads to the deoxygenation of water in ponds and lakes? A fertilisers containing nitrates and phosphates B toxic metal compounds C combustion products of fossil…

Oxides of nitrogen are produced by car engines. In a catalytic converter oxides of nitrogen are removed by reacting them with compound X. Which row describes the type of reaction…

Which row identifies the pressure and the catalyst used for the conversion of sulfur dioxide to sulfur trioxide in the Contact process? (columns: pressure / atm; catalyst) A 2;…

Which statements about the treatment of domestic water supplies are correct? 1 Filtration is used to remove insoluble substances from the water. 2 Sedimentation is used to remove…

Which oxide is used to neutralise acidic gases in flue gas desulfurisation? A calcium oxide B carbon dioxide C nitrogen oxide D sulfur dioxide

Some information about three gases, P, Q and R, is listed: gas P forms when magnesium reacts with dilute hydrochloric acid; gas Q makes up 78% of the air; gas R forms when gas P…

The Contact process is used to convert sulfur dioxide to sulfur trioxide. Vanadium(V) oxide is the catalyst: 2SO2(g) + O2(g) ⇌ 2SO3(g) The forward reaction is exothermic. Which…

Some substances found in water extracted from a river are listed: 1 plastics 2 nitrates 3 oxygen Which substances are harmful to aquatic life? A 1 and 2 B 1 and 3 C 2 only D 3 only

Car engines which use gasoline as a fuel produce oxides of nitrogen. Oxides of nitrogen are removed from the exhaust gases. Which statements about the formation or removal of…

Answer the following questions using only the structures in Fig. 1.1 (A = a giant covalent structure; B = methanol CH3OH; C = nitrogen N2; D = methanoic acid HCOOH; E = oxygen O2;…

Chlorophyll is a coloured compound found in plants. Chlorophyll is needed for photosynthesis. Complete the word equation for photosynthesis: carbon dioxide + water → +

Name the process that is used to convert sulfur dioxide into sulfur trioxide in the manufacture of sulfuric acid.

The symbol equation for the industrial production of ammonia is shown: N2(g) + 3H2(g) ⇌ 2NH3(g) ΔH = -90 kJ/mol Name this industrial process.

Glucose is involved in two processes. Glucose, C6H12O6, is made in plants from carbon dioxide and water. Name this process.

Name the process used to produce ammonia from nitrogen.

Some adverse effects caused by air pollutants are listed. - acid rain - photochemical smog - respiratory problems Which air pollutant contributes to all three of these adverse…

Three effects of air pollutants are listed. 1 photochemical smog 2 respiratory problems 3 acid rain Which effects are caused by oxides of nitrogen? A 1, 2 and 3 B 1 and 3 only C 1…

Fertilisers are mixtures of different compounds used to increase the growth of crops. Which pair of substances contain the three essential elements for plant growth? A ammonium…

Oxides of nitrogen formed in a car's engine are removed using a catalytic converter. What happens to the oxides of nitrogen in the catalytic converter? A They are hydrated. B They…

Which row identifies two greenhouse gases and three processes by which they contribute to global warming? two greenhouse gases three processes --- --- --- A carbon dioxide and…

Which mixture contains all of the elements in a typical NPK fertiliser? A ammonium nitrate and calcium phosphate B ammonium phosphate and potassium chloride C potassium nitrate…

A fertiliser contains ammonium nitrate and potassium phosphate. Why is the fertiliser described as an NPK fertiliser? A It provides nitrogen, which is an essential element for…

A list of oxides, A to H, is shown. A calcium oxide B aluminium oxide C silicon(IV) oxide D sulfur dioxide E carbon dioxide F iron(III) oxide G silver oxide H carbon monoxide…

Table 3.1 shows the average concentrations, in ng / 1000 cm³, of air pollutants in four different years. year ammonia hydrocarbons oxides of nitrogen particulates sulfur dioxide…

Table 3.1 shows the average concentrations, in ng / 1000 cm³, of air pollutants in four different years. year carbon monoxide hydrocarbons oxides of nitrogen particulates sulfur…

Answer the following questions using only the substances from the list (ammonia, calcium oxide, carbon monoxide, cobalt(II) chloride, ethane, ethanol, ethene, oxygen, potassium…

Table 3.1 shows the average concentrations, in ng / 1000 cm³, of air pollutants in four different years. year carbon monoxide hydrocarbons oxides of nitrogen particulates sulfur…

Answer the following questions using only the gases from the list (ammonia, carbon dioxide, carbon monoxide, ethene, fluorine, oxygen, sulfur dioxide, xenon). Each gas may be used…

This question is about nitrogen and some of its compounds. Nitrogen is converted into ammonia, NH3, in the Haber process. Nitrogen is obtained from air. State the percentage of…