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GCSE OCR Combined Science B Papers 2 and 6
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#1. What evidence supports the notion that human activities are contributing to climate change?
#2. What the the least dense state of matter?
#3. Why do both graphite and diamond have high melting points?
#4. Where is most of the mass of an atom?
#5. Calculate the relative formula mass of copper oxide (CuO) to 2 decimal places. Copper Aᵣ = 63.5, Oxygen Aᵣ = 16.
#6. Are non-metals usually good conductors of heat?
#7. What is the chemical symbol for sulfur?
#8. 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 →
#9. Which of the following is the chemical test for oxygen?
#10. What is the name of the force that holds together ions in ionic compounds?
#11. What is the formula for nitric acid?
#12. What is the chemical symbol for fluorine?
#13. Are metals usually good conductors of heat?
#14. Complete the equation: NaOH(aq) → Na⁺(aq) + ....
#15. What is the formula for the polyatomic ion ammonium?
#16. What method can we use to separate multiple types of liquids?
#17. Do metals usually have a high or low density?
#18. H₂SO₄(aq) + Na₂O(s) → .... + ....
Select all that apply:
#19. 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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#20. Which of the following are problems that would arise from measuring an extremely slow rate of reaction?
Select all that apply:
#21. Which description best describes mixtures?
#22. What state of matter has particles which are close together and vibrate around fixed positions?
#23. Relative atomic mass used to have a different name. What was that name?
#24. Why does the temperature of a material stay constant during the transition from liquid to gas?
#25. Complete the equation: H₂SO₄(aq) + ZnO(s) → .... + ....
Select all that apply:
#26. What type of substance is carbon dioxide (CO₂ )?
#27. What is the name of the phase change from gas to liquid?
#28. Displacement reactions sometimes occur between a metal and a compound of a less reactive metal. Are these reactions endothermic or exothermic?
#29. What does the atomic number of an element mean?
#30. What is the chemical symbol for sodium?
#31. What is the chemical symbol for helium?
#32. What type of substance is pure gold (Au)?
#33. Does increasing the pressure of gases increase the rate of reaction?
#34. What is the name of the phase change from solid to liquid?
#35. Which steps can we take to reduce the impact of climate change on humanity or prevent further climate change?
Select all that apply:
#36. In 1897 JJ. Thomson did a series of experiments that led to the discovery of which particles?
#37. How could we accurately monitor the rate of a reaction? ? Three answers
Select all that apply:
#38. During crystallisation, there is a risk of spitting which could cause harm. Which of the following could reduce the risk?
Select all that apply:
#39. When there are more frequent collisions between particles, what will happen to the rate of reaction?
#40. What is a solution called when it contains the maximum amount of solute that can dissolve in a solvent at a particular temperature?
#41. Which of the following was the Rutherford Model of atomic structure?
#42. What are negative ions called?
#43. Complete the following equation describing a neutralisation reaction with a metal oxide: metal oxide + acid → .... + ....
Select all that apply:
#44. What is the charge of a neutron?
#45. 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 → ..... + .....
#46. On the early Earth, there was a lot of volcanic activity as the planet was cooling down. How can we link this to the formation of the atmosphere?
#47. A soluble base is called?
#48. What is the chemical symbol for iron?
#49. Which of these best describes metallic bonding?
#50. 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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#51. What temperature is the boiling point of water?
#52. Why did the amount of oxygen in the atmosphere increase over time?
#53. What is the formula for sodium hydroxide?
#54. Which of these is the stationary phase in paper chromatography?
#55. What is the formula for the polyatomic ion sulfate?
#56. 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.
#57. Which of the following descriptions matches the Aᵣ of an element?
#58. Can compounds be pure, for example, carbon dioxide?
#59. What is the symbol for relative formula mass (also known as relative molecular mass)?
#60. What type of substance is the air?
Select all that apply:
#61. Energy is transferred between the environment and reactants during a chemical reaction. What form is this energy usually in?
#62. After filtering a mixture containing sand, salt and water using filter paper. What do we call what is left in the filter paper?
#63. What is a simple molecular structure?
#64. Determine the empirical formula of glucose - C₆H₁₂O₆.
#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. What is the name of the phase change from gas to solid?
#67. Alkalis produce an excess of what when they dissolve in water?
#68. Complete the following half equation for a reaction the cathode during electrolysis of molten lead bromide. Pb²⁺ + 2e → .....
#69. Complete the following equation describing a reaction with a metal carbonate and an acid: metal carbonate + acid → .... + .... + ....
Select all that apply:
#70. This image shows the apparatus used during fractional distillation. What is function of the fractionating column?
#71. Which of these descriptions best describes fullerenes?
#72. Are metals usually good conductors of electricity?
#73. Which of these is a fast reaction?
#74. Which three particles are atoms composed of?
#75. Why does diamond not conduct electricity?
#76. What is the name of the process by which salt is removed from water?
#77. Will endothermic reactions continue if there is no energy input?
#78. Which geological process formed Earth's atmosphere?
#79. What is the equation for Rf values in paper chromatography?
#80. What is the chemical symbol for carbon?
#81. Which human activities cause increases in the greenhouse gases - carbon dioxide and methane?
Select all that apply:
#82. When using inert electrodes to perform electrolysis with copper chloride solution, which products will be produced at the anode and cathode?
#83. When a mixture of rocks, salt and water is filtered, what will be the residue?
#84. Which of these describes the term "rate of reaction"?
#85. Why is there a minimum energy required for reactions to occur?
#86. What is the chemical symbol for lithium?
#87. How do sodium and chlorine atoms bond? ? you might need a periodic table to answer this question
#88. Which of the following describes the Plum Pudding Model of atomic structure?
#89. What is the chemical symbol for silver?
#90. Which of the following descriptions matches the term molecular formula?
#91. When using inert electrodes to perform electrolysis with sodium chloride solution, which products will be produced at the anode and cathode?
#92. Determine the empirical formula for Cyanuric triazide - C₃N₁₂.
#93. What is the chemical symbol for magnesium?
#94. When using inert electrodes to perform electrolysis with molten lead bromide, which products will be produced at the anode and cathode?
#95. Calculate the relative formula mass of water. Hydrogen Aᵣ = 1, Oxygen Aᵣ = 16.
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