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Tutor HuntTest QuestionsChemistry QuestionsYear 10 Chemistry Questions

 

How Carbon Dioxide Decreased (GCSE Chemistry)

The following is a GCSE Chemistry test covering 'How Carbon Dioxide Decreased' from the broader topic Chemistry Of The Atmosphere. The test is geared towards the AQA exam board style syllabus.
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Which statement best describes why CO2 decreased while oxygen increased in the atmosphere billions of years ago?
Which simple balanced equation represents the formation of calcium carbonate from dissolved CO2 and dissolved calcium?
Which observation would best indicate that less CO2 is being added to the atmosphere than removed by natural sinks over many years?
Which marine organisms contributed to lowering atmospheric CO2 by forming shells of calcium carbonate?
Which of these statements correctly links ocean chemistry and long-term CO2 storage?
Which action would increase the long-term geological removal of atmospheric CO2?
Which effect on seawater is caused by increased atmospheric CO2 dissolving into the oceans?
Which human action most directly reduces CO2 removal by natural long-term sinks?
Which of the following best describes why limestone formation is considered a long-term carbon sink?
Which is a direct chemical consequence when CO2 dissolves into seawater and forms carbonic acid?
Which of the following is a modern engineered technique that aims to mimic geological CO2 removal (a long-term decrease pathway)?