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

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

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

#4. What is the formula for calcium hydroxide?

#5. Complete the following half equation for a reaction the cathode during electrolysis of molten zinc chloride. Zn²⁺ + ….. → Zn

#6. 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

#7. What is the chemical symbol for potassium?

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

#9. What is the chemical symbol for fluorine?

#10. 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 cathode. Cu²⁺ + 2e →

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

#12. What is the chemical symbol for sodium?

#13. Complete the following equation describing a neutralisation reaction with a metal oxide: metal oxide + acid → …. + ….

Select all that apply:

#14. Displacement reactions sometimes occur between a metal and a compound of a less reactive metal. Are these reactions endothermic or exothermic?

#15. Do metals usually have a high or low density?

#16. Alkalis produce an excess of what when they dissolve in water?

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

Select all that apply:

#18. What are giant covalent structures?

#19. 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.

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

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

#22. Which of the following are the 4 factors that affect the rate of photosynthesis?

Select all that apply:

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

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

Select all that apply:

#25. What is the formula for the compound calcium nitrate which is made of calcium and nitrate ions (NO₃⁻)?

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

#27. What is the charge of an electron?

#28. What do we use fullerenes for?

#29. What is the chemical symbol for iodine?

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

#31. What is the chemical symbol for helium?

#32. What is the symbol for relative formula mass (also known as relative molecular mass)?

#33. What is the chemical symbol for magnesium?

#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. The distance travelled by a spot is determined by the solubility of the compound. How does solubility impact distance travelled?

#36. 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.

#37. Paper chromatography is used to separate which types of materials?

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

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

#40. What is the chemical symbol for nitrogen?

#41. Which of these descriptions best describes fullerenes?

#42. Which description best describes a compound?

#43. Why are metals malleable?

#44. Are metals usually good conductors of electricity?

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

#46. Do non-metals usually have a high or low melting point?

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

#48. What is the formula for sodium hydroxide?

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

#50. What is a simple molecular structure?

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

#52. Which type of reaction is aerobic respiration?

#53. How could you separate a mixture of sand and salt?

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

#55. What is the name of the process by which salt is removed from water?

#56. 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.

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

Select all that apply:

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

#59. What is the relative mass of an electron?

#60. What is the approximate radius of an atom?

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

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

#63. What type of substance is the air?

Select all that apply:

#64. What is the formula for sulfuric acid?

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

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

#67. What is a polymer?

#68. If covalent bonds are very strong, then why does water have a low melting point?

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

#70. Why is graphite softer than diamond?

#71. Determine the empirical formula of glucose – C₆H₁₂O₆.

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

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

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

#75. How do sodium and chlorine atoms bond? ? you might need a periodic table to answer this question

#76. Which of the following are properties of ionic compounds?

#77. Which description most accurately describes covalent bonding

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

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

#80. Why is magnesium a better electrical conductor than sodium?

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

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

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

#84. What is the chemical symbol for calcium?

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

Select all that apply:

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

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

#88. Which of these is a problem with 3D ball and stick models?

#89. What is the chemical symbol for carbon?

#90. True or false. All atoms of the same element have the same atomic number.

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