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GCSE AQA Chemistry Paper 2
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#1. Increasing the concentration of solutions increases the rate of reaction, why is this the case?
#2. 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?
#3. The table shows 3 substances and their melting points. Which type of substance is X?
#4. Paper chromatography is used to separate which types of materials?
#5. How did the oceans form?
#6. 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?
#7. Which of these reasons explains why temperature affects rate of reaction?
#8. Why did the concentration of carbon dioxide in the atmosphere decrease after the oceans formed?
#9. Why is there a minimum energy required for reactions to occur?
#10. What is the equation for Rf values in paper chromatography?
#11. Surface area to volume ratio affects rate of reaction. Why is that the case?
#12. 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.
#13. Is it possible to control the rate of reaction?
#14. Which of the following are commonly used as methods of sterilising fresh water? ? 3
Select all that apply:
#15. Which description best describes an element?
#16. After paper chromatography has been carried out, the paper is known as?
#17. Which of these describes the term "rate of reaction"?
#18. What type of substance is carbon dioxide (CO₂ )?
#19. Why did the amount of oxygen in the atmosphere increase over time?
#20. Which of these is the mobile phase in paper chromatography?
#21. The distance travelled by a spot is determined by the solubility of the compound. How does solubility impact distance travelled?
#22. 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:
#23. Because mixtures contain more than one substance and each has its own melting point, mixtures melt in which way?
#24. Fresh water contains many different contaminants and so must be cleaned before it becomes potable. Which is the correct treatment path?
#25. Which of the following is the chemical test for oxygen?
#26. Which types of atoms can be found in a pure piece of gold?
Select all that apply:
#27. True or false - You cannot use physical processes to separate mixtures into different substances.
#28. The graph shows a heating curve for substance X (red) and substance Y (blue). Is substance X a pure or impure substance?
#29. What is the current composition of the Earth's atmosphere?
#30. Which of these is a fast reaction?
#31. When there are more frequent collisions between particles, what will happen to the rate of reaction?
#32. What evidence supports the notion that human activities are contributing to climate change?
#33. Which of the following are problems that would arise from measuring an extremely slow rate of reaction?
Select all that apply:
#34. Which description best describes mixtures?
#35. How could we accurately monitor the rate of a reaction? ? Three answers
Select all that apply:
#36. Which of the following describe the composition of a pure substance?
Select all that apply:
#37. Which processes can we use for purifying sea water?
Select all that apply:
#38. 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?
#39. Will endothermic reactions continue if there is no energy input?
#40. Does increasing the pressure of gases increase the rate of reaction?
#41. Which of the following are uses for paper chromatography?
Select all that apply:
#42. Which of the following are the main sources of drinking water in the UK?
Select all that apply:
#43. Which description best describes a compound?
#44. 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.
#45. What temperature is the boiling point of water?
#46. Which geological process formed Earth's atmosphere?
#47. Which of the following are effects of climate change?
Select all that apply:
#48. Which evidence provides information about carbon dioxide concentration and global temperatures?
#49. The table shows 3 substances and their melting points. What common substance, in particular, could substance Z be?
#50. Temperature affects the rate of reaction. Which of the following is the correct description of what happens when temperature changes?
#51. Which steps can we take to reduce the impact of climate change on humanity or prevent further climate change?
Select all that apply:
#52. What type of substance is pure gold (Au)?
#53. Can compounds be pure, for example, carbon dioxide?
#54. Which of the following examples matches the composition of Earth's early atmosphere?
#55. Can Rf values be higher than 1?
#56. Will exothermic reactions continue if there is no energy input?
#57. What is the name of the process by which salt is removed from water?
#58. Which of these is the stationary phase in paper chromatography?
#59. Why do we use distilled water for chemical analysis?
#60. Why do historical measurements by humans of global temperature have some uncertainty?
Select all that apply:
#61. A paper chromatography experiment is carried out in a lab. The distance moved by the spot was 6cm and the solvent had moved by 8cm. Calculate the Rf value.
#62. Why may our attempts to mitigate the effects of climate change cause further damage to the environment?
#63. After filtering a mixture containing sand, salt and water using filter paper. What do we call what is left in the filter paper?
#64. The table shows 3 substances and their melting points. Which types of substances could Y be?
Select all that apply:
#65. 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?
#66. Which human activities cause increases in the greenhouse gases - carbon dioxide and methane?
Select all that apply:
#67. The graph shows a heating curve for substance X (red) and substance Y (blue). Is substance Y a pure or impure substance?
#68. What type of substance is the air?
Select all that apply:
#69. Why is a spark often needed to start a combustion reaction?
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