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GCSE OCR Chemistry B Paper 1
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#1. Copper can be purified using electrolysis of copper sulfate solution. For this process we use the setup in the image below. Complete the half equation for the reaction at the anode. Cu → ..... + .....
#2. Which of these reasons explains why temperature affects rate of reaction?
#3. Which description most accurately describes covalent bonding
#4. The graph shows a heating curve for substance X (red) and substance Y (blue). Is substance Y a pure or impure substance?
#5. Which of these are common properties of simple molecular (covalent) materials?
Select all that apply:
#6. What is the equation for Rf values in paper chromatography?
#7. What is the chemical symbol for fluorine?
#8. Which process can be used to separate water from dissolved salts, whilst keeping both substances?
#9. What is the freezing point of water?
#10. After paper chromatography has been carried out, the paper is known as?
#11. 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?
#12. After filtering a mixture containing sand, salt and water using filter paper. What do we call what is left in the filter paper?
#13. Covalent compounds typically form between which two types of material?
#14. What is the formula for the compound calcium nitrate which is made of calcium and nitrate ions (NO₃⁻)?
#15. 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?
#16. What do we use fullerenes for?
#17. When using inert electrodes to perform electrolysis with sodium chloride solution, which products will be produced at the anode and cathode?
#18. What is graphene?
#19. What is the approximate radius of a nucleus?
#20. Which three particles are atoms composed of?
#21. How many atoms of potassium (group 1) are needed to bond ionically with oxygen (group 6)?
#22. Fill in the gap. Metal atoms bond forming a giant ......... of ions.
#23. How did the oceans form?
#24. The table shows 3 substances and their melting points. Which type of substance is X?
#25. Complete the equation: H₂SO₄(aq) + ZnO(s) → .... + ....
Select all that apply:
#26. Which type of reaction is photosynthesis?
#27. During electrolysis which electrode do anions and cations migrate to?
#28. What is the chemical symbol for sodium?
#29. Which type of reaction takes in energy, making the surroundings cooler?
#30. Which scientist proposed the Plum Pudding Model?
#31. When using inert electrodes to perform electrolysis with sodium sulfate solution, which products will be produced at the anode and cathode?
#32. What the the least dense state of matter?
#33. Which of the following are the main sources of drinking water in the UK?
Select all that apply:
#34. What is the chemical symbol for nitrogen?
#35. If covalent bonds are very strong, then why does water have a low melting point?
#36. What is the relative mass of a neutron?
#37. What is the name of the force that holds together ions in ionic compounds?
#38. During crystallisation, there is a risk of spitting which could cause harm. Which of the following could reduce the risk?
Select all that apply:
#39. What is a polymer?
#40. Which of these is a problem with dot and cross diagrams?
#41. What is the formula for the polyatomic ion hydroxide?
#42. Which of the following are commonly used as methods of sterilising fresh water? ? 3
Select all that apply:
#43. What is the chemical symbol for silver?
#44. Why does diamond not conduct electricity?
#45. Displacement reactions sometimes occur between a metal and a compound of a less reactive metal. Are these reactions endothermic or exothermic?
#46. Solutions of less than pH 7 are?
#47. 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.
#48. Copper can be purified using electrolysis of copper sulfate solution. For this process we use the setup in the image below. Complete the half equation for the reaction at the cathode. Cu²⁺ + 2e →
#49. Which geological process formed Earth's atmosphere?
#50. 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:
#51. Strong acids do what in water? ? two words
#52. 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.
#53. What is the formula for hydrochloric acid?
#54. Are non-metals usually good conductors of heat?
#55. Calculate the relative formula mass of copper oxide (CuO) to 2 decimal places. Copper Aᵣ = 63.5, Oxygen Aᵣ = 16.
#56. Which of the following descriptions matches the Aᵣ of an element?
#57. Which of these is the stationary phase in paper chromatography?
#58. Why are metals malleable?
#59. What is the boiling temperature of water?
#60. What is the mass number of an element?
#61. What is the formula for sulfuric acid?
#62. What is the name of the phase change from liquid to solid?
#63. The table shows 3 substances and their melting points. Which types of substances could Y be?
Select all that apply:
#64. What state of matter has particles which are far apart and move around independently?
#65. When a mixture of rocks, salt and water is filtered, what will be the residue?
#66. Which of the following is the chemical test for oxygen?
#67. What is the name of the phase change from gas to liquid?
#68. Why may our attempts to mitigate the effects of climate change cause further damage to the environment?
#69. True or false - Precipitation reactions can be either exothermic or endothermic.
#70. What type of substance is the air?
Select all that apply:
#71. What is the formula for potassium hydroxide?
#72. Which description best describes a compound?
#73. What is the chemical symbol for chlorine?
#74. 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?
#75. What is an electrolyte?
#76. Which of the following are problems that would arise from measuring an extremely slow rate of reaction?
Select all that apply:
#77. True or false - You cannot use physical processes to separate mixtures into different substances.
#78. Which of the following items would you need to perform crystallisation by heating? ? 6 items
Select all that apply:
#79. Why is graphite softer than diamond?
#80. What is the name of the phase change from gas to solid?
#81. What is the chemical symbol for radium?
#82. What is the charge of a proton?
#83. What is the charge of an electron?
#84. Which evidence provides information about carbon dioxide concentration and global temperatures?
#85. What is the difference in concentration between pH 6 and pH 4?
#86. A soluble base is called?
#87. Which steps can we take to reduce the impact of climate change on humanity or prevent further climate change?
Select all that apply:
#88. Which of the following descriptions matches the term molecular formula?
#89. Which of the following are weak acids?
Select all that apply:
#90. Which of the following was the Rutherford Model of atomic structure?
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