Chemistry of the atmosphere

Oxygen is needed to burn fuels. Name the source of the oxygen needed to burn fuels.

Particulates and sulfur dioxide are pollutants produced when some fuels burn. What is the polluting effect of particulates?

Particulates and sulfur dioxide are pollutants produced when some fuels burn. What is the polluting effect of sulfur dioxide?

Which two gases are produced when fuels burn in car engines? Select two options.

Vehicles produce most of the atmospheric pollution in cities. How could the atmospheric pollution in cities be reduced? Select two options.

The Earth's early atmosphere was different to Earth's atmosphere today. Scientists think that the Earth's early atmosphere was like the atmosphere found on Venus today. Table 7 shows the amounts of carbon dioxide and oxygen in the atmospheres of Venus and Earth today. The percentages of carbon dioxide and oxygen have changed from Earth's early atmosphere to Earth's atmosphere today. Explain the processes that led to these changes.

Why are scientists not certain about the percentage of each gas in the Earth's early atmosphere?

This question is about burning fuels in central heating boilers. In the future, gas central heating boilers may burn hydrogen rather than natural gas. Table 2 shows information about these fuels when 1 dm³ of the fuel is burned in a central heating boiler. Explain how oxides of nitrogen are produced when burning fuels.

Explain one positive impact on the environment of burning hydrogen rather than natural gas as a fuel. Use Table 2.

Explain one negative impact on the environment of burning hydrogen rather than natural gas as a fuel. Use Table 2.