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GCSE OCR Chemistry B Paper 2
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#1. Calculate the relative formula mass of copper oxide (CuO) to 2 decimal places. Copper Aᵣ = 63.5, Oxygen Aᵣ = 16.
#2. Fresh water contains many different contaminants and so must be cleaned before it becomes potable. Which is the correct treatment path?
#3. Determine the empirical formula for Cyclopentane – C₅H₁₀?
#4. During crystallisation, there is a risk of spitting which could cause harm. Which of the following could reduce the risk?
Select all that apply:
#5. Which three particles are atoms composed of?
#6. Which scientist proposed the Plum Pudding Model?
#7. The table shows 3 substances and their melting points. Which types of substances could Y be?
Select all that apply:
#8. Fractional distillation is used to separate which types of materials?
#9. Why do we use distilled water for chemical analysis?
#10. 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?
#11. What is the chemical symbol for carbon?
#12. Reaction profiles are used to show the energy transfers during reactions. Which type of reaction is shown in this reaction profile?
#13. Fill in the blanks: Reduction refers to the …… of electrons and it occurs at the ……..
#14. Fill in the blanks: Electrolysis is a process in which ………. energy from a ………. current supply is used to decompose electrolytes.
#15. Will exothermic reactions continue if there is no energy input?
#16. Which of these descriptions best describes fullerenes?
#17. What is the name of the force that holds together ions in ionic compounds?
#18. What type of substance is pure gold (Au)?
#19. In 1897 JJ. Thomson did a series of experiments that led to the discovery of which particles?
#20. Why are metals malleable?
#21. What is the name of the phase change from gas to liquid?
#22. Which human activities cause increases in the greenhouse gases – carbon dioxide and methane?
Select all that apply:
#23. Why do simple molecules not conduct electricity?
#24. What is the relative mass of an electron?
#25. Which type of reaction transfers energy to the surroundings?
#26. 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?
#27. Which description best describes a compound?
#28. Why does graphite conduct electricity?
#29. What is the approximate radius of a nucleus?
#30. Solutions of less than pH 7 are?
#31. Which of these are common properties of giant covalent materials?
#32. When using inert electrodes to perform electrolysis with sodium chloride solution, which products will be produced at the anode and cathode?
#33. What are negative ions called?
#34. Are metals usually good conductors of electricity?
#35. Which types of atoms can be found in a pure piece of gold?
Select all that apply:
#36. 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?
#37. Which of the following are properties of ionic compounds?
#38. Reaction profiles are used to show the energy transfers during reactions. Which type of reaction is shown in this reaction profile?
#39. Chlorine has two stable isotopes, ³⁵Cl (75.77%) and ³⁷Cl (24.23%). Calculate the Aᵣ of chlorine to 2 decimal places.
#40. 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.
#41. What are positive ions called?
#42. Solutions of more than pH 7 are?
#43. What is the formula for nitric acid?
#44. The graph shows a heating curve for substance X (red) and substance Y (blue). Is substance Y a pure or impure substance?
#45. What is the symbol for relative formula mass (also known as relative molecular mass)?
#46. During a neutralisation reaction which salt is formed from sulfuric acid?
#47. Determine the empirical formula of glucose – C₆H₁₂O₆.
#48. Which of these is the stationary phase in paper chromatography?
#49. When a mixture of rocks, salt and water is filtered, what will be the residue?
#50. What is the formula for the polyatomic ion nitrate?
#51. When using inert electrodes to perform electrolysis with sodium sulfate solution, which products will be produced at the anode and cathode?
#52. What is the equation for Rf values in paper chromatography?
#53. The table shows 3 substances and their melting points. Which type of substance is X?
#54. Energy is transferred between the environment and reactants during a chemical reaction. What form is this energy usually in?
#55. Why is there a minimum energy required for reactions to occur?
#56. Why did Ernest Rutherford’s experiments with gold foil demonstrate that most of atoms consists of empty space?
#57. What is the mass number of an element?
#58. What is the symbol for relative atomic mass?
#59. Hydrogen has two stable isotopes, ¹H (abundance – 99.972%) and ²H (abundance – 0.001%). Calculate the Aᵣ of hydrogen. Answer to 3 decimal places.
#60. What method can we use to separate multiple types of liquids?
#61. What is the electronic configuration of a nitrogen atom? ? you might need a periodic table to answer this question
#62. Since metallically bonded atoms have a delocalised pool of electrons, these electrons are able to conduct ……
Select all that apply:
#63. Do non-metals usually have a high or low melting point?
#64. 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.
#65. 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.
#66. Which of the following is the chemical test for oxygen?
#67. What is the chemical symbol for potassium?
#68. What is the formula for the polyatomic ion sulfate?
#69. Can compounds be pure, for example, carbon dioxide?
#70. Which of the following descriptions matches the term empirical formula?
#71. 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.
#72. Fill in the blanks: Oxidation refers to the …… of electrons and it occurs at the ……..
#73. What is the chemical symbol for lithium?
#74. Will endothermic reactions continue if there is no energy input?
#75. During electrolysis which electrode do anions and cations migrate to?
#76. What is a solution called when it contains the maximum amount of solute that can dissolve in a solvent at a particular temperature?
#77. What is the current composition of the Earth’s atmosphere?
#78. Which of the following descriptions matches the Mᵣ of a compound?
#79. True or false – You cannot use physical processes to separate mixtures into different substances.
#80. Are non-metals usually good conductors of heat?
#81. What state of matter has particles which are close together and vibrate around fixed positions?
#82. The melting point of gallium is 29.8˚C and the boiling point is 2204˚C. What state is gallium at 25˚C?
#83. Which of the following was the Rutherford Model of atomic structure?
#84. What is the formula for the compound calcium nitrate which is made of calcium and nitrate ions (NO₃⁻)?
#85. Because mixtures contain more than one substance and each has its own melting point, mixtures melt in which way?
#86. What is the name of the phase change from solid to liquid?
#87. What is the chemical symbol for nitrogen?
#88. What is the name of the apparatus used for distillation?
#89. H₂SO₄(aq) + Na₂O(s) → …. + ….
Select all that apply: