GCSE OCR Chemistry Papers 1 and 3

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OCR Chemistry A Papers 1 and 3

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OCR Chemistry A Papers 1 and 3

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

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

Select all that apply:

fractional distillation diagram

#3. This image shows the apparatus used during fractional distillation. What is function of the fractionating column?

#4. What is an electrolyte?

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

Heating curve

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

#7. What is the chemical symbol for chlorine?

exothermic reaction graph

#8. Reaction profiles are used to show the energy transfers during reactions. Which type of reaction is shown in this reaction profile?

#9. Which scientist proposed the Plum Pudding Model?

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

#11. Where is most of the mass of an atom?

#12. Solutions of less than pH 7 are?

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

#14. What is the freezing point of water?

#15. What are ions?

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

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

#18. Which of the following describe the composition of a pure substance?

Select all that apply:

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

Select all that apply:

#20. What type of substance is carbon dioxide (CO₂ )?

#21. What is the chemical symbol for iron?

#22. What is the chemical symbol for helium?

#23. What are positive ions called?

#24. What is the name of the phase change from solid to liquid?

#25. What is the chemical symbol for hydrogen?

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

#27. Which of the following are weak acids?

Select all that apply:

#28. What is the relative mass of a neutron?

#29. What is the boiling temperature of water?

#30. 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.

#31. What are negative ions called?

#32. What is the name of the apparatus used for distillation?

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

#34. 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.

#35. 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.

#36. During a neutralisation reaction which salt is formed from sulfuric acid?

#37. Are metals usually shiny or dull in colour?

#38. Complete the equation: H₂SO₄(aq) + ZnO(s) → …. + ….

Select all that apply:

#39. Can strong and weak acids have the same pH?

#40. What is the chemical symbol for lithium?

#41. Are non-metals usually malleable or brittle?

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

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

Select all that apply:

#44. How many atoms of potassium (group 1) are needed to bond ionically with oxygen (group 6)?

#45. What is the chemical symbol for calcium?

#46. What is the chemical symbol for gold?

#47. What do group 2 atoms do when they bond with group 6 atoms?

#48. Which type of reaction transfers energy to the surroundings?

#49. Which of these is a problem with metallic models?

#50. Neutralisation reactions which occur between an acid and a base are always:

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

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

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

#54. Which of the following are uses for paper chromatography?

Select all that apply:

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

#56. Since metallically bonded atoms have a delocalised pool of electrons, these electrons are able to conduct ……

Select all that apply:

#57. What is the formula for sodium hydroxide?

#58. Why does graphite conduct electricity?

#59. Fill in the blanks: Oxidation refers to the …… of electrons and it occurs at the ……..

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

#61. Which description most accurately describes covalent bonding

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

#63. Are gases fluids?

#64. What is the name of the phase change from gas to liquid?

#65. H₂SO₄(aq) + Na₂O(s) → …. + ….

Select all that apply:

#66. When using inert electrodes to perform electrolysis with sodium sulfate solution, which products will be produced at the anode and cathode?

#67. What do group one atoms do when they bond ionically with group 7 atoms?

elements, compounds and mixtures

#68. The table shows 3 substances and their melting points. Which types of substances could Y be?

Select all that apply:

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

#70. Which electrode would the ion Mg²⁺ migrate to during electrolysis?

#71. What is the formula for potassium hydroxide?

Endothermic reaction graph

#72. Reaction profiles are used to show the energy transfers during reactions. Which type of reaction is shown in this reaction profile?

#73. Why is graphite softer than diamond?

elements, compounds and mixtures

#74. The table shows 3 substances and their melting points. Which type of substance is X?

Electrolysis of copper sulfate

#75. 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 → ….. + …..

#76. What is the chemical symbol for potassium?

#77. What is the equation for Rf values in paper chromatography?

#78. What is the symbol for relative atomic mass?

#79. What type of substance is the air?

Select all that apply:

#80. During crystallisation, there is a risk of spitting which could cause harm. Which of the following could reduce the risk?

Select all that apply:

#81. What is the chemical symbol for fluorine?

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

#83. What is the chemical symbol for sulfur?

#84. What is the molecular formula for glucose?

#85. What type of substance is pure gold (Au)?

#86. What temperature is the boiling point of water?

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

#88. What is the chemical symbol for silver?

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

#90. What is the name of the force that holds together ions in ionic compounds?

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