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GCSE OCR Combined Science B Papers 2 and 6
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#1. What is the chemical symbol for potassium?
#2. Complete the following half equation for a reaction the cathode during electrolysis of molten lead bromide. Pb²⁺ + 2e → …..
#3. In aqueous solutions such as sodium chloride solution, there will be positively charged ions from the salt (Na⁺) as well as hydrogen ions (H⁺). What is the rule that determines which will be discharged at the cathode.
#4. Which of the following items would you need to perform filtration?
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#5. The table shows 3 substances and their melting points. Which types of substances could Y be?
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#6. What is the chemical symbol for copper?
#7. In which type of reaction would the temperature of a solution increase?
#8. Are metals usually shiny or dull in colour?
#9. Which of these is a problem with metallic models?
#10. Which evidence provides information about carbon dioxide concentration and global temperatures?
#11. Solutions of less than pH 7 are?
#12. What type of substance is pure gold (Au)?
#13. What is the chemical symbol for nitrogen?
#14. During a neutralisation reaction which salt is formed from hydrochloric acid?
#15. Acids produce an excess of what when they dissolve in water?
#16. What is the approximate radius of a nucleus?
#17. Which of the following describes the Plum Pudding Model of atomic structure?
#18. What temperature is the boiling point of water?
#19. Most ionic bonds are formed between which groups?
#20. In aqueous solutions such as sodium chloride solution, there will be negatively charged ions from the salt (Cl⁻) as well as hydroxide ions (OH⁻). What is the rule that determines which will be discharged at the anode.
#21. Complete the equation: HCl (aq) → H⁺(aq) + …..
#22. What state of matter has particles which are far apart and move around independently?
#23. Why do both graphite and diamond have high melting points?
#24. What are giant covalent structures?
#25. Is water an example of a covalent compound?
#26. Hydrogen has two stable isotopes, ¹H (abundance – 99.972%) and ²H (abundance – 0.001%). Calculate the Aᵣ of hydrogen. Answer to 3 decimal places.
#27. What is the chemical symbol for hydrogen?
#28. Can strong and weak acids have the same pH?
#29. The table shows 3 substances and their melting points. Which type of substance is X?
#30. Chlorine has two stable isotopes, ³⁵Cl (75.77%) and ³⁷Cl (24.23%). Calculate the Aᵣ of chlorine to 2 decimal places.
#31. Are metals usually malleable or brittle?
#32. Which of these is a problem with dot and cross diagrams?
#33. What is the charge of a neutron?
#34. Lead has 4 stable isotopes. ²⁰⁴Pb (abundance – 1.4%), ²⁰⁵Pb (abundance – 24.1%), ²⁰⁷Pb (abundance – 22.1%) and ²⁰⁸Pb (abundance – 52.4%). Calculate the Aᵣ of lead. Answer to 2 decimal places.
#35. What is the symbol for relative formula mass (also known as relative molecular mass)?
#36. Temperature affects the rate of reaction. Which of the following is the correct description of what happens when temperature changes?
#37. What is the relative mass of a proton?
#38. Because mixtures contain more than one substance and each has its own melting point, mixtures melt in which way?
#39. When using inert electrodes to perform electrolysis with sodium chloride solution, which products will be produced at the anode and cathode?
#40. 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?
#41. What is the chemical symbol for helium?
#42. What is a solution called when it contains the maximum amount of solute that can dissolve in a solvent at a particular temperature?
#43. Which of these are common properties of giant covalent materials?
#44. Which of the following are weak acids?
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#45. This image shows the apparatus used during fractional distillation. What is function of the fractionating column?
#46. Which of the following items would you need to perform crystallisation by heating? ? 6 items
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#47. Which of the following are effects of climate change?
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#48. Why did Ernest Rutherford’s experiments with gold foil demonstrate that most of atoms consists of empty space?
#49. Which of the following are uses for paper chromatography?
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#50. Why is magnesium a better electrical conductor than sodium?
#51. What is the symbol for relative atomic mass?
#52. What is the formula for the polyatomic ion sulfate?
#53. Do non-metals usually have a high or low melting point?
#54. What is the name of the phase change from solid to liquid?
#55. What are positive ions called?
#56. Which of the following descriptions matches the Mᵣ of a compound?
#57. Which of the following are commonly used as methods of sterilising fresh water? ? 3
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#58. Complete the following half equation for a reaction the cathode during electrolysis of molten zinc chloride. Zn²⁺ + ….. → Zn
#59. Calcium nitrate contains the polyatomic ion NO₃⁻ (nitrate) and calcium. How many nitrate ions will be needed to make one molecule of calcium nitrate?
#60. What is the relative mass of a neutron?
#61. Fill in the gap. Metal atoms bond forming a giant ……… of ions.
#62. Displacement reactions sometimes occur between a metal and a compound of a less reactive metal. Are these reactions endothermic or exothermic?
#63. Do non-metals usually have a high or low density?
#64. How many sulfur atoms will react with two lithium atoms to form an ionic compound?
#65. Are non-metals usually good conductors of heat?
#66. Surface area to volume ratio affects rate of reaction. Why is that the case?
#67. Fractional distillation is used to separate which types of materials?
#68. Since metallically bonded atoms have a delocalised pool of electrons, these electrons are able to conduct ……
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#69. Will endothermic reactions continue if there is no energy input?
#70. Which of the following are the main sources of drinking water in the UK?
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#71. During crystallisation, there is a risk of spitting which could cause harm. Which of the following could reduce the risk?
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#72. Calculate the relative formula mass of water. Hydrogen Aᵣ = 1, Oxygen Aᵣ = 16.
#73. What is the chemical symbol for iodine?
#74. Why does the temperature of a material stay constant during the transition from liquid to gas?
#75. 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?
#76. What do group 2 atoms do when they bond with group 6 atoms?
#77. After paper chromatography has been carried out, the paper is known as?
#78. When using inert electrodes to perform electrolysis with copper chloride solution, which products will be produced at the anode and cathode?
#79. What are ions?
#80. Are non-metals usually good conductors of electricity?
#81. Which of the following are strong acids?
Select all that apply: