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GCSE OCR Combined Science B Papers 2 and 6
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#1. Match the following description to the correct term. X is a mixture made of dissolved substances in a liquid.
#2. Which of the following are commonly used as methods of sterilising fresh water? ? 3
Select all that apply:
#3. What is the difference in concentration between pH 6 and pH 4?
#4. What is the name of the force that holds together ions in ionic compounds?
#5. What is the formula for sulfuric acid?
#6. Why are metals malleable?
#7. Reaction profiles are used to show the energy transfers during reactions. Which type of reaction is shown in this reaction profile?
#8. During Ernest Rutherford’s experiments with gold foil, why did some of the particles bounce back?
#9. Temperature affects the rate of reaction. Which of the following is the correct description of what happens when temperature changes?
#10. The table shows 3 substances and their melting points. What common substance, in particular, could substance Z be?
#11. Solutions of pH 7 are?
#12. What method can we use to separate multiple types of liquids?
#13. Why did the concentration of carbon dioxide in the atmosphere decrease after the oceans formed?
#14. When using inert electrodes to perform electrolysis with water acidified with sulfuric acid, which products will be produced at the anode and cathode?
#15. What is the name of the phase change from solid to gas?
#16. Do non-metals usually have a high or low density?
#17. Isotopes of atoms have different numbers of which particles?
#18. Complete the following equation describing a neutralisation reaction with a metal oxide: metal oxide + acid → …. + ….
Select all that apply:
#19. What do group one atoms do when they bond ionically with group 7 atoms?
#20. What is the formula for potassium hydroxide?
#21. Do non-metals usually have a high or low melting point?
#22. During a neutralisation reaction which salt is formed from sulfuric acid?
#23. 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
#24. Which of the following items would you need to perform crystallisation by heating? ? 6 items
Select all that apply:
#25. What is the freezing point of water?
#26. What is the name of the phase change from liquid to gas?
#27. Complete the following equation describing a reaction with a metal and an acid: metal + acid → …. + ….
Select all that apply:
#28. In 1897 JJ. Thomson did a series of experiments that led to the discovery of which particles?
#29. What is the chemical symbol for calcium?
#30. Displacement reactions sometimes occur between a metal and a compound of a less reactive metal. Are these reactions endothermic or exothermic?
#31. Fill in the blanks: Reduction refers to the …… of electrons and it occurs at the ……..
#32. Because mixtures contain more than one substance and each has its own melting point, mixtures melt in which way?
#33. What state of matter has particles which are far apart and move around independently?
#34. What is the formula for the compound calcium nitrate which is made of calcium and nitrate ions (NO₃⁻)?
#35. What is the chemical symbol for phosphorus?
#36. Which of these are common properties of simple molecular (covalent) materials?
Select all that apply:
#37. Which of the following are the main sources of drinking water in the UK?
Select all that apply:
#38. Solutions of more than pH 7 are?
#39. What is the formula for the polyatomic ion carbonate?
#40. Which of these descriptions best describes fullerenes?
#41. What is the relative mass of a proton?
#42. Which of these is the stationary phase in paper chromatography?
#43. What state of matter has particles which are close together and vibrate around fixed positions?
#44. Which electrode would the ion Mg²⁺ migrate to during electrolysis?
#45. Oxygen is in group 6 and fluorine is in group 7. How many fluorine atoms bond with one oxygen atom?
#46. The melting point of gallium is 29.8˚C and the boiling point is 2204˚C. What state is gallium at 25˚C?
#47. When using inert electrodes to perform electrolysis with copper chloride solution, which products will be produced at the anode and cathode?
#48. What type of substance is carbon dioxide (CO₂ )?
#49. What is a polymer?
#50. What are positive ions called?
#51. Which of the following was the Rutherford Model of atomic structure?
#52. What is the chemical symbol for radium?
#53. 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?
#54. Reaction profiles are used to show the energy transfers during reactions. Which type of reaction is shown in this reaction profile?
#55. Why does graphite conduct electricity?
#56. Will exothermic reactions continue if there is no energy input?
#57. Why does diamond not conduct electricity?
#58. Which of these is the mobile phase in paper chromatography?
#59. What the the most dense state of matter?
#60. Are non-metals usually shiny or dull in colour?
#61. Are non-metals usually good conductors of heat?
#62. The distance travelled by a spot is determined by the solubility of the compound. How does solubility impact distance travelled?
#63. What is graphene?
#64. Which type of reaction takes in energy, making the surroundings cooler?
#65. Which three particles are atoms composed of?
#66. During a neutralisation reaction which salt is formed from hydrochloric acid?
#67. Which of the following are uses for paper chromatography?
Select all that apply:
#68. What is the mass number of an element?
#69. Which of the following describe the composition of a pure substance?
Select all that apply:
#70. 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.
#71. The graph shows a heating curve for substance X (red) and substance Y (blue). Is substance X a pure or impure substance?
#72. What is the boiling temperature of water?
#73. Which of the following is the chemical test for oxygen?
#74. What is a simple molecular structure?
#75. Surface area to volume ratio affects rate of reaction. Why is that the case?
#76. What is the electronic configuration of a nitrogen atom? ? you might need a periodic table to answer this question
#77. Fractional distillation is used to separate which types of materials?
#78. What is the relative mass of an electron?
#79. When using inert electrodes to perform electrolysis with sodium sulfate solution, which products will be produced at the anode and cathode?
#80. This image shows the apparatus used during fractional distillation. What is function of the fractionating column?
#81. Which of the following are properties of ionic compounds?
#82. 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?
#83. Which human activities cause increases in the greenhouse gases – carbon dioxide and methane?
Select all that apply:
#84. After filtering a mixture containing sand, salt and water using filter paper. What do we call what is left in the filter paper?
#85. What is the chemical symbol for lithium?
#86. During crystallisation, there is a risk of spitting which could cause harm. Which of the following could reduce the risk?
Select all that apply:
#87. What are negative ions called?
#88. What is the charge of a proton?
#89. Relative atomic mass used to have a different name. What was that name?
#90. Why is magnesium a better electrical conductor than sodium?
#91. Can Rf values be higher than 1?
#92. Which types of atoms can be found in a pure piece of gold?
Select all that apply: