The Earth is almost spherical and is surrounded by an atmosphere - AQA - GCSE Chemistry - Question 6 - 2014 - Paper 1
Question 6
The Earth is almost spherical and is surrounded by an atmosphere.
Figure 5 shows a section of the layered structure of the Earth.
Figure 5
6 (a) In 1915 Alfred We... show full transcript
Worked Solution & Example Answer:The Earth is almost spherical and is surrounded by an atmosphere - AQA - GCSE Chemistry - Question 6 - 2014 - Paper 1
Step 1
Why did most scientists in 1915 not accept Wegener's idea of continental drift?
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Answer
Most scientists did not accept Wegener's idea of continental drift because he could not provide sufficient evidence to explain how continents could move. They found his arguments unconvincing and lacking in scientific proof.
Step 2
Describe how and explain why continental drift takes place.
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Answer
Continental drift occurs due to the movement of tectonic plates that make up the Earth's crust. This movement is caused by convection currents in the mantle, which arise from the heat released by radioactive processes within the Earth. The convection currents create a force that pushes and pulls the tectonic plates, leading to the gradual movement of continents.
Step 3
Suggest one reason why carbon dioxide is removed before the gases are cooled to -200 °C.
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Carbon dioxide is removed before cooling because it forms a solid or freezes at higher temperatures, which could block the pipes used in the separation process.
Step 4
Draw a ring around one gas that does not condense when the remaining gases are cooled to -200 °C.
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Answer
The gas that does not condense is "neon."
Step 5
Name the gas and give a reason for your answer.
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Answer
The other gas contained in the oxygen is "argon," because its boiling point is very close to that of oxygen, allowing it to remain in the gaseous state during the separation process.
