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GCSE OCR Chemistry B Paper 2
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#1. What the the least dense state of matter?
#2. What is an electrolyte?
#3. What is the chemical symbol for copper?
#4. Which of these is a fast reaction?
#5. Complete the following half equation for a reaction the cathode during electrolysis of molten lead bromide. Pb²⁺ + 2e → .....
#6. Which of these is a problem with metallic models?
#7. Which of the following are the main sources of drinking water in the UK?
Select all that apply:
#8. Which of these are common properties of giant covalent materials?
#9. Which type of reaction transfers energy to the surroundings?
#10. What is the formula for calcium hydroxide?
#11. Determine the empirical formula of glucose - C₆H₁₂O₆.
#12. What is the current composition of the Earth's atmosphere?
#13. What is the electronic configuration of a nitrogen atom? ? you might need a periodic table to answer this question
#14. Calcium nitrate contains the polyatomic ion NO₃⁻ (nitrate) and calcium. How many nitrate ions will be needed to make one molecule of calcium nitrate?
#15. Which description best describes a compound?
#16. Are non-metals usually good conductors of electricity?
#17. Fresh water contains many different contaminants and so must be cleaned before it becomes potable. Which is the correct treatment path?
#18. What is the formula for sodium hydroxide?
#19. Filtration and crystallisation are used to separate which types of materials?
#20. What is the boiling temperature of water?
#21. How did the oceans form?
#22. Neutralisation reactions which occur between an acid and a base are always:
#23. Calculate the relative formula mass of water. Hydrogen Aᵣ = 1, Oxygen Aᵣ = 16.
#24. Acids produce an excess of what when they dissolve in water?
#25. Which of the following is the chemical test for oxygen?
#26. Do non-metals usually have a high or low melting point?
#27. The distance travelled by a spot is determined by the solubility of the compound. How does solubility impact distance travelled?
#28. What do group one atoms do when they bond ionically with group 7 atoms?
#29. Complete the equation: H₂SO₄(aq) + ZnO(s) → .... + ....
Select all that apply:
#30. Surface area to volume ratio affects rate of reaction. Why is that the case?
#31. Are non-metals usually shiny or dull in colour?
#32. Which description most accurately describes covalent bonding
#33. H₂SO₄(aq) + Na₂O(s) → .... + ....
Select all that apply:
#34. Which of the following descriptions matches the term empirical formula?
#35. What is the chemical symbol for fluorine?
#36. The graph shows a heating curve for substance X (red) and substance Y (blue). Is substance Y a pure or impure substance?
#37. What is the formula for hydrochloric acid?
#38. A soluble base is called?
#39. Complete the following equation describing a neutralisation reaction with a metal oxide: metal oxide + acid → .... + ....
Select all that apply:
#40. Which description best describes mixtures?
#41. Hydrogen has two stable isotopes, ¹H (abundance - 99.972%) and ²H (abundance - 0.001%). Calculate the Aᵣ of hydrogen. Answer to 3 decimal places.
#42. Reaction profiles are used to show the energy transfers during reactions. Which type of reaction is shown in this reaction profile?
#43. What is the formula for the polyatomic ion ammonium?
#44. Why may our attempts to mitigate the effects of climate change cause further damage to the environment?
#45. What is the chemical symbol for mercury?
#46. The table shows 3 substances and their melting points. What common substance, in particular, could substance Z be?
#47. 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.
#48. Which of these are common properties of simple molecular (covalent) materials?
Select all that apply:
#49. After paper chromatography has been carried out, the paper is known as?
#50. Which of the following descriptions matches the term molecular formula?
#51. What is the formula for the polyatomic ion carbonate?
#52. What do group 2 atoms do when they bond with group 6 atoms?
#53. Fill in the gap. Metal atoms bond forming a giant ......... of ions.
#54. What is the approximate radius of an atom?
#55. What is the name of the phase change from liquid to gas?
#56. Are non-metals usually good conductors of heat?
#57. What is the chemical symbol for potassium?
#58. Is water an example of a covalent compound?
#59. Determine the empirical formula for Cyanuric triazide - C₃N₁₂.
#60. What is the chemical symbol for phosphorus?
#61. 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?
#62. Complete the equation: H⁺(aq) + OH⁻(aq) → ....
Remember:
acids produce an excess of hydrogen ions
alkalis produce an excess of hydroxide ions
hydrogen ions and hydroxide ions come together to make water which is neutral.
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#63. 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?
#64. Which of the following are commonly used as methods of sterilising fresh water? ? 3
Select all that apply:
#65. Why do historical measurements by humans of global temperature have some uncertainty?
Select all that apply:
#66. What is the approximate radius of a nucleus?
#67. Why is graphite softer than diamond?
#68. Are metals usually shiny or dull in colour?
#69. What is the relative mass of a neutron?
#70. The melting point of gallium is 29.8˚C and the boiling point is 2204˚C. What state is gallium at 25˚C?
#71. What is the chemical symbol for hydrogen?
#72. What is a polymer?
#73. What state of matter has particles which are far apart and move around independently?
#74. Energy is transferred between the environment and reactants during a chemical reaction. What form is this energy usually in?
#75. Can compounds be pure, for example, carbon dioxide?
#76. Which of these is a problem with 3D ball and stick models?
#77. During a neutralisation reaction which salt is formed from hydrochloric acid?
#78. 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.
#79. During a neutralisation reaction which salt is formed from sulfuric acid?
#80. Which of the following are uses for paper chromatography?
Select all that apply:
#81. 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
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#82. What is the name of the apparatus used for distillation?
#83. 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.
#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. Most ionic bonds are formed between which groups?
#86. Which of the following describes the Plum Pudding Model of atomic structure?
#87. Why did the amount of oxygen in the atmosphere increase over time?
#88. What is the charge of a proton?
#89. Alkalis produce an excess of what when they dissolve in water?
#90. True or false - Precipitation reactions can be either exothermic or endothermic.
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