GCSE OCR Chemistry B Paper 2

Mock test. 1 hour and 45 minutes. 90 marks available.

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OCR Chemistry B Paper 2

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OCR Chemistry B Paper 2

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#1. What state of matter has particles which are far apart and move around independently?

#2. True or false – Precipitation reactions can be either exothermic or endothermic.

#3. What is the formula for the polyatomic ion hydroxide?

#4. What is the electronic configuration of a nitrogen atom? ? you might need a periodic table to answer this question

#5. What is the chemical symbol for sodium?

#6. Which of these best describes metallic bonding?

#7. Most ionic bonds are formed between which groups?

#8. Strong acids do what in water? ? two words

#9. Which processes can we use for purifying sea water?

Select all that apply:

#10. What is the chemical symbol for calcium?

#11. What is the chemical symbol for phosphorus?

#12. Which of these is the mobile phase in paper chromatography?

#13. What state of matter has particles which are close together and move around each other?

#14. Calculate the relative formula mass of carbon monoxide (CO) to 2 decimal places. Carbon Aᵣ = 12, Oxygen Aᵣ = 16.

#15. Complete the following equation describing a reaction with a metal carbonate and an acid: metal carbonate + acid → …. + …. + ….

Select all that apply:

#16. How many sulfur atoms will react with two lithium atoms to form an ionic compound?

#17. What is the current composition of the Earth’s atmosphere?

#18. Which description most accurately describes covalent bonding

#19. What is the chemical symbol for silver?

#20. During a neutralisation reaction which salt is formed from hydrochloric acid?

#21. Do non-metals usually have a high or low density?

#22. What are positive ions called?

#23. What is the relative mass of a proton?

#24. Which evidence provides information about carbon dioxide concentration and global temperatures?

#25. 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 → ….. + …..

#26. What is the formula for potassium oxide? ? you might need a periodic table to answer this question

#27. What is the chemical symbol for helium?

#28. Which of these is a problem with dot and cross diagrams?

#29. Why does graphite conduct electricity?

#30. What is the name of the phase change from gas to solid?

#31. Which of the following descriptions matches the term empirical formula?

#32. Which of the following items would you need to perform crystallisation by heating? ? 6 items

Select all that apply:

#33. Are non-metals usually shiny or dull in colour?

#34. What is the formula for potassium hydroxide?

#35. Why did the concentration of carbon dioxide in the atmosphere decrease after the oceans formed?

#36. Chlorine has two stable isotopes, ³⁵Cl (75.77%) and ³⁷Cl (24.23%). Calculate the Aᵣ of chlorine to 2 decimal places.

#37. Complete the following half equation for a reaction the cathode during electrolysis of molten lead bromide. Pb²⁺ + 2e → …..

#38. What is the difference in concentration between pH 6 and pH 4?

#39. Which of the following descriptions matches the Aᵣ of an element?

#40. What is the formula for the polyatomic ion ammonium?

#41. 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?

#42. Is it possible to control the rate of reaction?

#43. When a mixture of rocks, salt and water is filtered, what will be the residue?

#44. Complete the equation: HCl (aq) → H⁺(aq) + …..

#45. Fill in the gap. Metal atoms bond forming a giant ……… of ions.

#46. Complete the equation: NaOH(aq) → Na⁺(aq) + ….

#47. Why do we use distilled water for chemical analysis?

#48. Why do both graphite and diamond have high melting points?

#49. Calculate the relative formula mass of water. Hydrogen Aᵣ = 1, Oxygen Aᵣ = 16.

#50. Calcium nitrate contains the polyatomic ion NO₃⁻ (nitrate) and calcium. How many nitrate ions will be needed to make one molecule of calcium nitrate?

#51. Which of the following are weak acids?

Select all that apply:

#52. What evidence supports the notion that human activities are contributing to climate change?

#53. What is the mass number of an element?

#54. Which of the following descriptions matches the term molecular formula?

#55. What is the chemical symbol for iron?

#56. What is the charge of a neutron?

#57. What is the chemical symbol for hydrogen?

#58. Solutions of pH 7 are?

#59. What type of substance is the air?

Select all that apply:

#60. The graph shows a heating curve for substance X (red) and substance Y (blue). Is substance Y a pure or impure substance?

#61. Which of the following describes the Plum Pudding Model of atomic structure?

#62. Why is there a minimum energy required for reactions to occur?

#63. Which geological process formed Earth’s atmosphere?

#64. The graph shows a heating curve for substance X (red) and substance Y (blue). Is substance X a pure or impure substance?

#65. Ernest Rutherford fired positive particles at a thin gold foil and showed that most of atoms is empty space. Which particles did he fire at the gold foil?

#66. Why did Ernest Rutherford’s experiments with gold foil demonstrate that most of atoms consists of empty space?

#67. Do metals usually have a high or low melting point?

#68. What is a simple molecular structure?

#69. Fractional distillation is used to separate which types of materials?

#70. What is a solution called when it contains the maximum amount of solute that can dissolve in a solvent at a particular temperature?

#71. Which type of reaction takes in energy, making the surroundings cooler?

#72. Hydrogen has two stable isotopes, ¹H (abundance – 99.972%) and ²H (abundance – 0.001%). Calculate the Aᵣ of hydrogen. Answer to 3 decimal places.

#73. Does increasing the pressure of gases increase the rate of reaction?

#74. Which of these descriptions best describes fullerenes?

#75. What is the formula for calcium hydroxide?

#76. Oxygen is in group 6 and fluorine is in group 7. How many fluorine atoms bond with one oxygen atom?

#77. Which of the following items would you need to perform filtration?

Select all that apply:

#78. After paper chromatography has been carried out, the paper is known as?

#79. Relative atomic mass used to have a different name. What was that name?

#80. 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?

#81. 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.

#82. What does the atomic number of an element mean?

#83. Which of the following are strong acids?

Select all that apply:

#84. Which of these is the stationary phase in paper chromatography?

#85. During a neutralisation reaction which salt is formed from nitric acid?

#86. What is the approximate radius of a nucleus?

#87. Complete the equation: H⁺(aq) + OH⁻(aq) → ….

Remember:

acids produce an excess of hydrogen ions

alkalis produce an excess of hydroxide ions

hydrogen ions and hydroxide ions come together to make water which is neutral.

#88. What is the formula for hydrochloric acid?

#89. 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.

#90. Why does the temperature of a material stay constant during the transition from liquid to gas?

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