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unit-4-review-worksheet

unit-4-review-worksheet - Review Energy Changes(5 Rates of...

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Review : Energy Changes (5), Rates of Reaction (18), Nuclear chemistry (23) The test You will be given a Δ H ° f table 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 questions 1. Label each example as exothermic or endothermic a) 2H 2 (g) + O 2 (g) 2H 2 O(g) Δ H ° = -243 kJ b) H 2 B 4 O 7 (s) B 2 O 3 (s) + H 2 O(l) Δ H ° = 17.5 kJ d) H 2 B 4 O 7 (s) + H 2 O(l) 4HBO 2 (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 CH 4 are 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 CH 4 in kJ/mol.
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