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GCSE OCR Chemistry B Paper 1
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#1. Will exothermic reactions continue if there is no energy input?
#2. Fill in the blanks: Oxidation refers to the …… of electrons and it occurs at the ……..
#3. Complete the equation: HCl (aq) → H⁺(aq) + …..
#4. Covalent compounds typically form between which two types of material?
#5. Why did Ernest Rutherford’s experiments with gold foil demonstrate that most of atoms consists of empty space?
#6. Match the following description to the correct term. X is a mixture made of dissolved substances in a liquid.
#7. What is the name of the apparatus used for distillation?
#8. Are gases fluids?
#9. What is a solution called when it contains the maximum amount of solute that can dissolve in a solvent at a particular temperature?
#10. What is the chemical symbol for lithium?
#11. Displacement reactions sometimes occur between a metal and a compound of a less reactive metal. Are these reactions endothermic or exothermic?
#12. During Ernest Rutherford’s experiments with gold foil, why did some of the particles bounce back?
#13. What is the chemical symbol for mercury?
#14. After paper chromatography has been carried out, the paper is known as?
#15. Which of these best describes metallic bonding?
#16. Why do historical measurements by humans of global temperature have some uncertainty?
Select all that apply:
#17. 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
#18. Fill in the blanks: Electrolysis is a process in which ………. energy from a ………. current supply is used to decompose electrolytes.
#19. Most ionic bonds are formed between which groups?
#20. Fractional distillation is used to separate which types of materials?
#21. Which of these is a problem with metallic models?
#22. Which type of reaction is photosynthesis?
#23. Acids produce an excess of what when they dissolve in water?
#24. Which description best describes a compound?
#25. Which of these are common properties of simple molecular (covalent) materials?
Select all that apply:
#26. Which electrode would the ion Mg²⁺ migrate to during electrolysis?
#27. Which of the following are commonly used as methods of sterilising fresh water? ? 3
Select all that apply:
#28. The table shows 3 substances and their melting points. Which type of substance is X?
#29. When a mixture of rocks, salt and water is filtered, what will be the residue?
#30. How do sodium and chlorine atoms bond? ? you might need a periodic table to answer this question
#31. What is the chemical symbol for carbon?
#32. What the the most dense state of matter?
#33. Fill in the blanks: Reduction refers to the …… of electrons and it occurs at the ……..
#34. What is the formula for the compound calcium nitrate which is made of calcium and nitrate ions (NO₃⁻)?
#35. The distance travelled by a spot is determined by the solubility of the compound. How does solubility impact distance travelled?
#36. What is the formula for hydrochloric acid?
#37. What is the relative mass of a proton?
#38. Calculate the relative formula mass of copper oxide (CuO) to 2 decimal places. Copper Aᵣ = 63.5, Oxygen Aᵣ = 16.
#39. Are non-metals usually shiny or dull in colour?
#40. 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 →
#41. What is the chemical symbol for chlorine?
#42. What do group 2 atoms do when they bond with group 6 atoms?
#43. The melting point of gallium is 29.8˚C and the boiling point is 2204˚C. What state is gallium at 25˚C?
#44. Which of the following items would you need to perform filtration?
Select all that apply:
#45. What is a simple molecular structure?
#46. What is the chemical symbol for fluorine?
#47. What do group one atoms do when they bond ionically with group 7 atoms?
#48. When using inert electrodes to perform electrolysis with sodium chloride solution, which products will be produced at the anode and cathode?
#49. Oxygen is in group 6 and fluorine is in group 7. How many fluorine atoms bond with one oxygen atom?
#50. When using inert electrodes to perform electrolysis with molten lead bromide, which products will be produced at the anode and cathode?
#51. Solutions of more than pH 7 are?
#52. What is the mass number of an element?
#53. What is the chemical symbol for radium?
#54. Hydrogen has two stable isotopes, ¹H (abundance – 99.972%) and ²H (abundance – 0.001%). Calculate the Aᵣ of hydrogen. Answer to 3 decimal places.
#55. What is the formula for the polyatomic ion carbonate?
#56. Which scientist proposed the Plum Pudding Model?
#57. Complete the equation: NaOH(aq) → Na⁺(aq) + ….
#58. Which processes can we use for purifying sea water?
Select all that apply:
#59. True or false. All atoms of the same element have the same atomic number.
#60. What is the chemical symbol for iron?
#61. 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?
#62. Because mixtures contain more than one substance and each has its own melting point, mixtures melt in which way?
#63. Why does diamond not conduct electricity?
#64. What is the charge of a proton?
#65. Which of the following was the Rutherford Model of atomic structure?
#66. Relative atomic mass used to have a different name. What was that name?
#67. What does the atomic number of an element mean?
#68. What is the formula for potassium hydroxide?
#69. What is the relative mass of an electron?
#70. How many atoms of potassium (group 1) are needed to bond ionically with oxygen (group 6)?
#71. Which of the following is the chemical test for oxygen?
#72. What is the chemical symbol for potassium?
#73. Which of the following are weak acids?
Select all that apply:
#74. What is the formula for sulfuric acid?
#75. What is the chemical symbol for hydrogen?
#76. If covalent bonds are very strong, then why does water have a low melting point?
#77. 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.
#78. What the the least dense state of matter?
#79. Neutralisation reactions which occur between an acid and a base are always:
#80. What is an electrolyte?
#81. Strong acids do what in water? ? two words
#82. Which of the following describe the composition of a pure substance?
Select all that apply:
#83. Do non-metals usually have a high or low melting point?
#84. Fill in the gap. Metal atoms bond forming a giant ……… of ions.
#85. What temperature is the boiling point of water?
#86. The graph shows a heating curve for substance X (red) and substance Y (blue). Is substance Y a pure or impure substance?
#87. What is the name of the phase change from liquid to gas?
#88. Since metallically bonded atoms have a delocalised pool of electrons, these electrons are able to conduct ……
Select all that apply:
#89. Reaction profiles are used to show the energy transfers during reactions. Which type of reaction is shown in this reaction profile?
#90. Which of the following are uses for paper chromatography?
Select all that apply: