C1 Quick Revision Questions - WordPress.com · C5 Quick Revision Questions C5 for AQA GCSE...
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C5 Quick Revision Questions
C5 for AQA GCSE examination 2018 onwards
H = Higher tier only
SS = Separate science only
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Question 1
• Define an exothermic reaction
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• One that transfers energy to the surroundings so the temperature of the surroundings increases
Answer 1 .... of 20
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Question 2
• What is the energy needed to start a reaction?
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• Activation energy
Answer 2 .... of 20
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Question 3
• Sketch a reaction profile for an endothermic reaction
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Answer 3 .... of 20
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Question 4
• What three things can reaction profiles show?
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• Relative energies of reactants and products
• Activation energy
• Overall energy change of a reaction
Answer 4 .... of 20
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Question 5
• Explain in an exothermic reaction in terms of bond breaking and making
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• Less energy is needed to break bond than released on making new bonds
Answer 5 .... of 20
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Question 6
• What is the sum of the bond energies for 2 moles of the molecule below?
• C-H 412 kJ/mol
• C-C 368 kJ/mol
• C=O 532 kJ/mol
• C-O 352 kJ/mol
• H-O 465 kJ/mol
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Answer 6 .... of 20
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• 2 (3 x C-H) = 2 (3 x 412) = 2472• 2 x C-C = 2 x 368 = 736• 2 x C=O = 2 x 532 = 1064• 2 x C-O = 2 x 352 = 704• 2 x H-O = 2 x 465 = 930
= 5906 kJ/mol
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Question 7
• How does a cell between copper and zinc work?
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• Copper is put into a solution of zinc ions
• Zinc metal will be deposited and copper metal will become copper ions in solution
• The difference is reactivity between the two metals will cause a change in voltage (seen through a voltmeter)
Answer 7 .... of 20
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Question 8
• What do batteries consist of?
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• Two or more cells connected together in a series to provide a greater voltage
Answer 8 .... of 20
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Question 9
• Why can rechargeable cells and batteries be recharged?
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• The chemical reactions are reversed when an external electrical current is supplied
Answer 9 .... of 20
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Question 10
• How is the voltage produced in terms of the relative reactivities of the two metals?
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• The more reactive metal forces the less reactive metal to accept electrons. Voltages are based on the ‘relative’ reactivity of metals
Answer 10 .... of 20
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Question 11
A cell was set up with Ni electrodes in nickel(II) sulfate and silver electrodes in silver sulfate.
Write half equations for the reactions that occur at the electrodes
Ni forms Ni2+ ions and silver forms Ag+
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• Ag2+ + e- Ag+
• Ni+ Ni2+ + e-
Answer 11 .... of 20
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Question 12
• What is special about fuel cells?
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• They don’t need replacing or recharging like ordinary cells and batteries
Answer 12 .... of 20
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Question 13
• Write a balanced symbol equation for the reaction of hydrogen with oxygen
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• 2H2 +O2 2H2O
Answer 13 .... of 20
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Question 14
• Why do hydrogen and oxygen not explode in a fuel cell?
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• The energy released from the reaction is converted into electrical energy (very efficient process)
Answer 14 .... of 20
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Question 15
• Give two advantages of fuel cells
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• Direct energy transfer (chemical energy into electrical energy). Energy does not have to be converted into heat first
• Fewer transfer stages
• Less polluting, as water is the product
• Fuel cells last longer than conventional rechargeable batteries
Answer 15 .... of 20
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Question 16
• What happens to the fuel in the fuel cell?
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• The fuel is oxidised electrochemically within the fuel cell to produce a potential difference
Answer 16 .... of 20
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Question 17
• Why is the fuel cell reaction a redox reaction?
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Electrons are gained and lost
Answer 17 .... of 20
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Question 18
• How would you go about measuring the amount of energy an alcohol gives as a fuel?
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• Allow the energy to transfer into a body of water whilst burning the alcohol in oxygen
• Measure the temperature increase of the water
Answer 18 .... of 20
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Question 19
• What type of energy changes are:
• Bond breaking
• Bond making
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• Bond breaking = endothermic
• Bond making = exothermic
Answer 19 .... of 20
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Question 20
• Tom investigates temperature changes during a reaction with cold acid. How could he
minimise heat losses?
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• Put a lid on the beaker
• Insulate the beaker/vessel
Answer 20 .... of 20
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