Review: Energy Changes (5), Rates of Reaction (18), Nuclear chemistry (23) The test•You will be given a ΔH°ftable on the test along with a detailed periodic table. •The format will be similar to past tests with about 20 marks from written questions (mostly covering chapter 5 and 23 material) and 30 from multiple choice questions (mostly covering chapter 18 material). •Because the end of the chapters tend to tie concepts together, there will be a focus on these concepts/sections. Review questions1.Label each example as exothermic or endothermic a)2H2(g) + O2(g) →2H2O(g) ΔH°= -243 kJb)H2B4O7(s) →B2O3(s) + H2O(l) ΔH°= 17.5 kJ d)H2B4O7(s) + H2O(l) →4HBO2(aq) + 11.3 kJ e)c)The temperature of water in a calorimeter increases, thus the reaction of the sample in the calorimeter is _____ 2.10 grams of CH4are burned in oxygen. The 500 grams of water in the calorimeter increases in temperature from 22.0°C to 22.4°C. Calculate the heat of combustion of CH4in kJ/mol.
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