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GCSE OCR Chemistry B Paper 2
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#1. What is the formula for nitric acid?
#2. Are non-metals usually good conductors of electricity?
#3. What is the current composition of the Earth’s atmosphere?
#4. Which of the following things were hypothesised by John Dalton in 1805? ? select 4 answers
Select all that apply:
#5. Which of the following are uses for paper chromatography?
Select all that apply:
#6. Where is most of the mass of an atom?
#7. What is the name of the phase change from liquid to solid?
#8. 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.
#9. What are giant covalent structures?
#10. Complete the following equation describing a neutralisation reaction with a metal oxide: metal oxide + acid → …. + ….
Select all that apply:
#11. 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.
#12. What is the name of the phase change from gas to solid?
#13. Which steps can we take to reduce the impact of climate change on humanity or prevent further climate change?
Select all that apply:
#14. What type of substance is the air?
Select all that apply:
#15. During crystallisation, there is a risk of spitting which could cause harm. Which of the following could reduce the risk?
Select all that apply:
#16. Which type of reaction takes in energy, making the surroundings cooler?
#17. Which of the following are weak acids?
Select all that apply:
#18. Are non-metals usually good conductors of heat?
#19. Which of these are common properties of simple molecular (covalent) materials?
Select all that apply:
#20. Which of the following describes the Plum Pudding Model of atomic structure?
#21. Why did the concentration of carbon dioxide in the atmosphere decrease after the oceans formed?
#22. Strong acids do what in water? ? two words
#23. What do group 2 atoms do when they bond with group 6 atoms?
#24. What is the formula for the compound calcium nitrate which is made of calcium and nitrate ions (NO₃⁻)?
#25. What is the boiling temperature of water?
#26. 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 → ….. + …..
#27. Which types of atoms can be found in a pure piece of gold?
Select all that apply:
#28. True or false – You cannot use physical processes to separate mixtures into different substances.
#29. Which type of reaction is photosynthesis?
#30. Displacement reactions sometimes occur between a metal and a compound of a less reactive metal. Are these reactions endothermic or exothermic?
#31. What is the chemical symbol for gold?
#32. Which of the following are effects of climate change?
Select all that apply:
#33. Which geological process formed Earth’s atmosphere?
#34. Does increasing the pressure of gases increase the rate of reaction?
#35. What is the name of the phase change from solid to liquid?
#36. Solutions of more than pH 7 are?
#37. What method can we use to separate multiple types of liquids?
#38. Calcium nitrate contains the polyatomic ion NO₃⁻ (nitrate) and calcium. How many nitrate ions will be needed to make one molecule of calcium nitrate?
#39. 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
#40. Which of the following was the Rutherford Model of atomic structure?
#41. When using inert electrodes to perform electrolysis with sodium sulfate solution, which products will be produced at the anode and cathode?
#42. During electrolysis which electrode do anions and cations migrate to?
#43. What is the formula for sulfuric acid?
#44. What is the formula for the polyatomic ion sulfate?
#45. What are negative ions called?
#46. What is the relative mass of a neutron?
#47. What is the chemical symbol for calcium?
#48. Which of these best describes metallic bonding?
#49. Can strong and weak acids have the same pH?
#50. Which process can be used to separate water from dissolved salts, whilst keeping both substances?
#51. Which electrode would the ion Mg²⁺ migrate to during electrolysis?
#52. How many atoms of potassium (group 1) are needed to bond ionically with oxygen (group 6)?
#53. 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.
#54. What is the formula for the polyatomic ion nitrate?
#55. Fill in the blanks: Electrolysis is a process in which ………. energy from a ………. current supply is used to decompose electrolytes.
#56. Which of the following are properties of ionic compounds?
#57. What is the name of the phase change from gas to liquid?
#58. Fill in the blanks: Oxidation refers to the …… of electrons and it occurs at the ……..
#59. Which of the following are the main sources of drinking water in the UK?
Select all that apply:
#60. Which of the following is the chemical test for oxygen?
#61. Oxygen is in group 6 and fluorine is in group 7. How many fluorine atoms bond with one oxygen atom?
#62. Which of these are common properties of giant covalent materials?
#63. Which of the following describe the composition of a pure substance?
Select all that apply:
#64. Increasing the concentration of solutions increases the rate of reaction, why is this the case?
#65. 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?
#66. How could we accurately monitor the rate of a reaction? ? Three answers
Select all that apply:
#67. In 1897 JJ. Thomson did a series of experiments that led to the discovery of which particles?
#68. Isotopes of atoms have different numbers of which particles?
#69. Is it possible to control the rate of reaction?
#70. What is the chemical symbol for sodium?
#71. 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.
#72. In which type of reaction would the temperature of a solution increase?
#73. What is a solution called when it contains the maximum amount of solute that can dissolve in a solvent at a particular temperature?
#74. Filtration and crystallisation are used to separate which types of materials?
#75. The distance travelled by a spot is determined by the solubility of the compound. How does solubility impact distance travelled?
#76. Neutralisation reactions which occur between an acid and a base are always:
#77. Which of the following descriptions matches the Aᵣ of an element?
#78. Do non-metals usually have a high or low density?
#79. What is the formula for hydrochloric acid?
