Mock test. 1 hour and 10 minutes. 60 marks available.
Each time the test is taken it will present different questions.
GCSE OCR Combined Science A Papers 4 and 10
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#1. Why did the concentration of carbon dioxide in the atmosphere decrease after the oceans formed?
#2. Which of these is a fast reaction?
#3. Which of the following are the main sources of drinking water in the UK?
Select all that apply:
#4. What is the evidence supporting the idea that there was very little oxygen in the atmosphere in Earth's early atmosphere?
Select all that apply:
#5. Which steps can we take to reduce the impact of climate change on humanity or prevent further climate change?
Select all that apply:
#6. Is it possible to control the rate of reaction?
#7. Greenhouse effect 2) Fill in the blanks: Greenhouse gases such as ........... , ............. and ........... absorb infrared radiation from the Earth and re-emit it back to the Earth's surface, causing warming.
#8. Which of the following is the chemical test for oxygen?
#9. Which of the following are problems that would arise from measuring an extremely slow rate of reaction?
Select all that apply:
#10. Why do we use distilled water for chemical analysis?
#11. What is the name of the process by which salt is removed from water?
#12. When there are more frequent collisions between particles, what will happen to the rate of reaction?
#13. Greenhouse effect 1) Fill in the blanks: Energy from the sun in the form of ........ hits the Earth's surface and ....... are emitted back towards the atmosphere.
#14. Why did the amount of oxygen in the atmosphere increase over time?
#15. On the early Earth, there was a lot of volcanic activity as the planet was cooling down. How can we link this to the formation of the atmosphere?
#16. Why is a spark often needed to start a combustion reaction?
#17. Temperature affects the rate of reaction. Which of the following is the correct description of what happens when temperature changes?
#18. Surface area to volume ratio affects rate of reaction. Why is that the case?
#19. Chemical reactions require a high enough collision energy for reactions to take place. What do we call the minimum amount of energy needed for a reaction?
#20. Increasing the concentration of solutions increases the rate of reaction, why is this the case?
#21. Why do historical measurements by humans of global temperature have some uncertainty?
Select all that apply:
#22. Which of these reasons explains why temperature affects rate of reaction?
#23. Why is there a minimum energy required for reactions to occur?
#24. Does increasing the pressure of gases increase the rate of reaction?
#25. What evidence supports the notion that human activities are contributing to climate change?
#26. Iron is turned into iron oxide when exposed to the air. This is a process also known as rusting. Is the rate of reaction fast or slow in rusting?
#27. Will endothermic reactions continue if there is no energy input?
#28. Which of the following are effects of climate change?
Select all that apply:
#29. Which evidence provides information about carbon dioxide concentration and global temperatures?
#30. Which of the following are commonly used as methods of sterilising fresh water? ? 3
Select all that apply:
#31. Which of these describes the term "rate of reaction"?
#32. In an experiment to measure the rate of photosynthesis of pondweed in a test tube, the number of bubbles (oxygen) produced per minute is used to determine the rate of reaction. What is this experiment actually measuring?
#33. Which of the following examples matches the composition of Earth's early atmosphere?
#34. Which human activities cause increases in the greenhouse gases - carbon dioxide and methane?
Select all that apply:
#35. How did the oceans form?
#36. Which processes can we use for purifying sea water?
Select all that apply:
#37. How could we accurately monitor the rate of a reaction? ? Three answers
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#38. Which geological process formed Earth's atmosphere?
#39. Will exothermic reactions continue if there is no energy input?
#40. What is the current composition of the Earth's atmosphere?
#41. Why may our attempts to mitigate the effects of climate change cause further damage to the environment?
#42. Fresh water contains many different contaminants and so must be cleaned before it becomes potable. Which is the correct treatment path?
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