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GCSE OCR Combined Science B Papers 2 and 6
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#1. After paper chromatography has been carried out, the paper is known as?
#2. Which type of reaction takes in energy, making the surroundings cooler?
#3. Can strong and weak acids have the same pH?
#4. What is the formula for hydrochloric acid?
#5. What are negative ions called?
#6. Which of these are common properties of simple molecular (covalent) materials?
Select all that apply:
#7. Are metals usually good conductors of heat?
#8. During a neutralisation reaction which salt is formed from sulfuric acid?
#9. Why do we use distilled water for chemical analysis?
#10. What is an electrolyte?
#11. Which of the following descriptions matches the Aᵣ of an element?
#12. The table shows 3 substances and their melting points. Which type of substance is X?
#13. Which of the following describe the composition of a pure substance?
Select all that apply:
#14. Solutions of less than pH 7 are?
#15. What is the chemical symbol for iodine?
#16. What is the symbol for relative atomic mass?
#17. What is the chemical symbol for fluorine?
#18. What type of substance is the air?
Select all that apply:
#19. Energy is transferred between the environment and reactants during a chemical reaction. What form is this energy usually in?
#20. 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.
#21. True or false – Precipitation reactions can be either exothermic or endothermic.
#22. What do group one atoms do when they bond ionically with group 7 atoms?
#23. What is a polymer?
#24. Since metallically bonded atoms have a delocalised pool of electrons, these electrons are able to conduct ……
Select all that apply:
#25. Solutions of pH 7 are?
#26. What state of matter has particles which are close together and vibrate around fixed positions?
#27. Calculate the relative formula mass of carbon monoxide (CO) to 2 decimal places. Carbon Aᵣ = 12, Oxygen Aᵣ = 16.
#28. What is the name of the process by which salt is removed from water?
#29. 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?
#30. What is the formula for calcium hydroxide?
#31. The graph shows a heating curve for substance X (red) and substance Y (blue). Is substance Y a pure or impure substance?
#32. When a mixture of rocks, salt and water is filtered, what will be the residue?
#33. What is the approximate radius of an atom?
#34. Which of the following are strong acids?
Select all that apply:
#35. How did the oceans form?
#36. What is a solution called when it contains the maximum amount of solute that can dissolve in a solvent at a particular temperature?
#37. What is the evidence supporting the idea that there was very little oxygen in the atmosphere in Earth’s early atmosphere?
Select all that apply:
#38. In which type of reaction would the temperature of a solution increase?
#39. During electrolysis which electrode do anions and cations migrate to?
#40. What is the formula for the polyatomic ion nitrate?
#41. The melting point of gallium is 29.8˚C and the boiling point is 2204˚C. What state is gallium at 25˚C?
#42. Which of the following examples matches the composition of Earth’s early atmosphere?
#43. Fractional distillation is used to separate which types of materials?
#44. Are non-metals usually malleable or brittle?
#45. If covalent bonds are very strong, then why does water have a low melting point?
#46. When there are more frequent collisions between particles, what will happen to the rate of reaction?
#47. What is the approximate radius of a nucleus?
#48. What temperature is the boiling point of water?
#49. When using inert electrodes to perform electrolysis with copper chloride solution, which products will be produced at the anode and cathode?
#50. Match the following description to the correct term. X is a mixture made of dissolved substances in a liquid.
#51. Chlorine has two stable isotopes, ³⁵Cl (75.77%) and ³⁷Cl (24.23%). Calculate the Aᵣ of chlorine to 2 decimal places.
#52. Is water an example of a covalent compound?
#53. Do metals usually have a high or low density?
#54. Do metals usually have a high or low melting point?
#55. Which types of atoms can be found in a pure piece of gold?
Select all that apply:
#56. During crystallisation, there is a risk of spitting which could cause harm. Which of the following could reduce the risk?
Select all that apply:
#57. Which of the following descriptions matches the term empirical formula?
#58. What is the formula for the compound calcium nitrate which is made of calcium and nitrate ions (NO₃⁻)?
#59. Reaction profiles are used to show the energy transfers during reactions. Which type of reaction is shown in this reaction profile?
#60. Determine the empirical formula of glucose – C₆H₁₂O₆.
#61. The table shows 3 substances and their melting points. Which types of substances could Y be?
Select all that apply:
#62. True or false – You cannot use physical processes to separate mixtures into different substances.
#63. What is the chemical symbol for chlorine?
#64. Why are metals malleable?
#65. How do sodium and chlorine atoms bond? ? you might need a periodic table to answer this question
#66. What is the chemical symbol for sulfur?
#67. What is the boiling temperature of water?
#68. Why does graphite conduct electricity?
#69. Which of the following descriptions matches the Mᵣ of a compound?
#70. What method can we use to separate multiple types of liquids?
#71. In 1897 JJ. Thomson did a series of experiments that led to the discovery of which particles?
#72. Complete the equation: HCl (aq) + KOH(s) → ….. + …..
Select all that apply:
#73. Do non-metals usually have a high or low melting point?
#74. What is the chemical symbol for radon?
#75. What is the chemical symbol for mercury?
#76. Which of the following descriptions matches the term molecular formula?
#77. A soluble base is called?
#78. Why did the concentration of carbon dioxide in the atmosphere decrease after the oceans formed?
#79. During a neutralisation reaction which salt is formed from hydrochloric acid?
#80. When using inert electrodes to perform electrolysis with sodium chloride solution, which products will be produced at the anode and cathode?
#81. Which human activities cause increases in the greenhouse gases – carbon dioxide and methane?
Select all that apply:
#82. Are gases fluids?
#83. What the the least dense state of matter?
