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GCSE OCR Chemistry Papers 1 and 3
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#1. Which of the following descriptions matches the term molecular formula?
#2. What are positive ions called?
#3. What are negative ions called?
#4. 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.
#5. What is the chemical symbol for chlorine?
#6. What is the name of the force that holds together ions in ionic compounds?
#7. Are metals usually good conductors of electricity?
#8. What is the formula for sulfuric acid?
#9. What is the chemical symbol for carbon?
#10. The graph shows a heating curve for substance X (red) and substance Y (blue). Is substance X a pure or impure substance?
#11. What is the relative mass of an electron?
#12. Are metals usually malleable or brittle?
#13. Acids produce an excess of what when they dissolve in water?
#14. Filtration and crystallisation are used to separate which types of materials?
#15. What is the chemical symbol for copper?
#16. What method can we use to separate multiple types of liquids?
#17. In which type of reaction would the temperature of a solution increase?
#18. Which of the following descriptions matches the term empirical formula?
#19. Which of these is the mobile phase in paper chromatography?
#20. What do group one atoms do when they bond ionically with group 7 atoms?
#21. What is the charge of a neutron?
#22. Which of these is the correct explanation for why photosynthesis is slower at lower temperatures?
#23. The graph shows a heating curve for substance X (red) and substance Y (blue). Is substance Y a pure or impure substance?
#24. What is the chemical symbol for oxygen?
#25. What is a polymer?
#26. What is the formula for calcium hydroxide?
#27. Strong acids do what in water? ? two words
#28. Determine the empirical formula for Cyclopentane – C₅H₁₀?
#29. Complete the following half equation for a reaction the cathode during electrolysis of molten lead bromide. Pb²⁺ + 2e → …..
#30. Why is graphite softer than diamond?
#31. Calcium nitrate contains the polyatomic ion NO₃⁻ (nitrate) and calcium. How many nitrate ions will be needed to make one molecule of calcium nitrate?
#32. After filtering a mixture containing sand, salt and water using filter paper. What do we call what is left in the filter paper?
#33. Reaction profiles are used to show the energy transfers during reactions. Which type of reaction is shown in this reaction profile?
#34. How could you separate a mixture of sand and salt?
#35. What does the atomic number of an element mean?
#36. In 1897 JJ. Thomson did a series of experiments that led to the discovery of which particles?
#37. What is the symbol for relative atomic mass?
#38. Which of these is a problem with 3D ball and stick models?
#39. Complete the equation: HCl (aq) → H⁺(aq) + …..
#40. When using inert electrodes to perform electrolysis with sodium sulfate solution, which products will be produced at the anode and cathode?
#41. Do metals usually have a high or low melting point?
#42. The table shows 3 substances and their melting points. Which type of substance is X?
#43. Why does the temperature of a material stay constant during the transition from liquid to gas?
#44. During a neutralisation reaction which salt is formed from sulfuric acid?
#45. What is the freezing point of water?
#46. Are non-metals usually shiny or dull in colour?
#47. What is the chemical symbol for iodine?
#48. Which of the following are weak acids?
Select all that apply:
#49. What is the formula for the polyatomic ion nitrate?
#50. Which of the following are uses for paper chromatography?
Select all that apply:
#51. What are giant covalent structures?
#52. Reaction profiles are used to show the energy transfers during reactions. Which type of reaction is shown in this reaction profile?
#53. 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.
#54. What are ions?
#55. Which of these are common properties of giant covalent materials?
#56. What is the balanced chemical equation for photosynthesis?
#57. When using inert electrodes to perform electrolysis with molten lead bromide, which products will be produced at the anode and cathode?
#58. Complete the following equation: MgO (s) + H₂SO₄ (aq) → …. + ….
Select all that apply:
Neutralisation reactions follow the general structure –
metal oxide acid = salt water
the acid produces hydrogen ions and the metal oxide produces oxide ions – these combine to make the water
the salt is comprised of the remaining products – the metal and the other element from the acid
in this case, the other element is chlorine
The naming convention is to put the metal first for the salt created
#59. What is the chemical symbol for sodium?
#60. What is the word equation for photosynthesis? ? In some examples you might also see sunlight and chlorophyll above and below the arrow.
#61. 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.
#62. Energy is transferred between the environment and reactants during a chemical reaction. What form is this energy usually in?
#63. Why are metals malleable?
#64. What is the formula for the compound calcium nitrate which is made of calcium and nitrate ions (NO₃⁻)?
#65. Are non-metals usually good conductors of heat?
#66. Match the following description to the correct term. X is a mixture made of dissolved substances in a liquid.
#67. Since metallically bonded atoms have a delocalised pool of electrons, these electrons are able to conduct ……
Select all that apply:
#68. Which description best describes an element?
#69. Which description best describes a compound?
#70. Is water an example of a covalent compound?
#71. Which of the following descriptions matches the Aᵣ of an element?
#72. Do metals usually have a high or low density?
#73. Which type of reaction is aerobic respiration?
#74. What is the chemical symbol for nitrogen?
#75. Paper chromatography is used to separate which types of materials?
#76. What do group 2 atoms do when they bond with group 6 atoms?
#77. What is the chemical symbol for radon?
#78. What is the name of the phase change from liquid to solid?
#79. What is the relative mass of a proton?
#80. Determine the empirical formula of glucose – C₆H₁₂O₆.
#81. What is the chemical symbol for silver?
#82. Fill in the blanks: Electrolysis is a process in which ………. energy from a ………. current supply is used to decompose electrolytes.
#83. Complete the equation: HCl (aq) + KOH(s) → ….. + …..
Select all that apply:
#84. Because mixtures contain more than one substance and each has its own melting point, mixtures melt in which way?
#85. What state of matter has particles which are close together and vibrate around fixed positions?
#86. What state of matter has particles which are close together and move around each other?
#87. During a neutralisation reaction which salt is formed from hydrochloric acid?
#88. What is the chemical symbol for hydrogen?
#89. Which of the following describe the composition of a pure substance?
Select all that apply: