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chemistry igcse acapprinted 44 · PDF 44
145 pagesrevision 46934
printed 44 · PDF 44
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44
2(C-Cl) +1990 = 2670
2(C-Cl) = 680
(C-Cl) = 240 kJ/mol.
Past paper questions
P2 :
Which of the following processes is endothermic ?
Sodium reacting with water
Magnesium burning in oxygen
Distilling crude oil
USe of petrol in an engine
Which statement is correct ?
Bond breaking requires energy and is an exothermic process
Bond breaking requires energy and is an endothermic process
Bond breaking releases energy and is an exothermic process
Bond breaking releases energy and is an endothermic process
Endothermic reactions are used in emergency sports treatment packs .Which statement is true
about them :
Absorb thermal energy from surrounding and transfer to injury
Can be reused
Usually contain ammonium nitrate and water in separate compartments
Cause temperature of surroundings to increase