Edexcel Jan 2017 (IAL) Paper 2 Q4 (with explained solutions) |

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Edexcel Jan 2017 (IAL) Paper 2 Q4

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4 The ozone layer is depleted by a series of reactions involving trichlorofluoromethane, CFCl3. Some of the possible reactions are A E R A S I H T N I E T I R W T O N O D A E R A S I H T N I E T I R W T O N O D A E R A S I H T N Reaction 1 Reaction 2 Reaction 3 Reaction 4 O3 + O (cid:111) 2O2 CFCl3 (cid:111) CFCl2 + Cl O3 + Cl (cid:111) ClO + O2 ClO + O (cid:111) Cl + O2 (a) Which is an initiation reaction? (1) A Reaction 1 B Reaction 2 C Reaction 3 D Reaction 4 (b) In the reactions shown above, what best describes the role of the chlorine free radical in the depletion of ozone? A Catalyst Inhibitor Initiator D Terminator (c) Which of the following is a possible termination reaction? A Cl + O2 (cid:111) ClO + Cl (cid:111) ClO B O C ClO + ClO (cid:111) Cl2O2 + O D CFCl2+ O3 (cid:111) CFCl2O + O2 (1) (1) (Total for Question 4 = 3 marks) I E T I R W T O N O D *P48368A0324* Turn over<br />

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Section A Question Number 1 Question Number 2 Question Number 3 Question Number 4(a) Question Number 4(b) Correct Answer AThis is a displacement reaction and not a disproportionation reaction BThis is a redox reaction but not a disproportionation reaction C This is a redox reaction but not a disproportionation reaction DThis is the correct answer Correct Answer ABoth species have the same bond angles as they are both v-shaped BBoth species have the same bond angles as both are tetrahedral CThis is the correct answer DBoth species have the same bond angles as both are linear Correct Answer A - Infrared radiation does not break bonds BThis is the correct answer C - Ultraviolet radiation does break bonds but this is not responsible for global warming D - Ultraviolet radiation does not cause bond vibration but this is also not responsible for global warming Correct Answer A - This is a termination reaction BThis is the correct answer C - This is a propagation reaction D - This is a propagation reaction Correct Answer AThis is the correct answer B - Chlorine is catalysing and not inhibiting C - The best description is catalyst rather than initiator because the chlorine is regenerated and is a product of the initiation reaction. D - Chlorine is not in any termination reaction Mark Mark Mark Mark Mark<br />
Question Number 4(c) Question Number 5 Question Number 6 Question Number 7 Question Number 8 Question Number 9 Correct Answer A - This is a propagation reaction and not a termination reaction B - This is a propagation reaction and not a termination reaction CThis is the correct answer D - This is a propagation reaction and not a termination reaction Correct Answer ABromine does not have permanent dipoles BThis is a statement and not an explanation CThis question is about intermolecular forces and not the strength of covalent bonds DThis is the correct answer Correct Answer AThis molecule only has a chain length of 4 carbons and so has less London forces resulting in a lower boiling temperature BBranching reduces the boiling temperature C - Branching reduces the boiling temperature DThis is the correct answer Correct Answer ABond length is from nuclei to nuclei and not to outermost electrons BThis is the correct answer C - Bond length is from nuclei to nuclei and not to outermost electrons D - Bond length is from nuclei to nuclei and not to outermost electrons Correct Answer ACatalysts do increase reaction rate BIncreased concentration does increase reaction rate CThis is the correct answer D - Increased temperature does increase reaction rate Correct Answer AIncreasing the pressure does not increase molecular energies BA correct statement but does not refer to reaction rate CThis is the correct answer D - Increased pressure does not decrease activation energy Mark Mark Mark Mark Mark Mark<br />

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