超急!!! GCE ALChem Unit4 Jan2007

2012-10-04 6:23 am
Question 1: http://store.aqa.org.uk/qual/gceasa/qp-ms/AQA-CHM4-W-QP-JAN07.PDF
Answer: http://store.aqa.org.uk/qual/gceasa/qp-ms/AQA-CHM4-W-MS-JAN07.PDF

can anyone explain why the order of reaction with respect to A is 2?
thanks!!

回答 (1)

2012-10-04 9:07 am
✔ 最佳答案
>> 做呢一type 問題, 係咁多個experiment 入面, 我會先睇邊一個exp 只係vary 左一個factor. 係呢個問題入面, 你見到exp 1 同exp 2 係B 既conc x 4 既時間, 個rate 都跟住x 4. 所以佢就係1st order (因為你知道0 order 係conc. 點轉個rate 都唔會變, 而如果係1st order 既話, 就係conc x 2, rate x 2, 而2nd order 就係conc. x 2 rate x 4)

>> 從exp 1 同exp 2 入面, 你見到B 個order 係1. 咁就apply 番呢個order 入去exp 2 同3 入面, 對比exp 2 同3 既condition, 你見到B 既conc. x 0.5, 而A 既conc x 2. 既然b 既order 係1, 咁即係話, 如果B conc. x 0.5, 個rate 都會係 x 0.5. 所以假設A 既conc. 冇變的話, 個rate suppose 係0.8 x 10^-3. 而而家A 既conc x 2, 個rate x 4. (ie 由0.8 x 10^-3 變到3.2 x 10^-3), 所以A 個order 就係2了.

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