1. which of the following processes is endothermic?
A. condersation of steam into water
B. dilution of concentrate sulphuric acid with water
C. combustion of ethanol
D. sublimation of solid iodine
2. which of the following processes is exothermic?
A. petrol evaporation
B. ice melting
C. cracking of heavy oils
D.calcium oxide added to water
Chem MC question
2007-01-08 12:22 am
回答 (2)
2007-01-08 1:38 am
✔ 最佳答案
1 D,,,要令一樣solid 變gas...一定要吸收能量2 D...calcium oxide 溶落水會放熱嫁...不過唔係隻隻oxide 都係exothermic 既..要讀到AL 先會有詳細小小既解釋~
參考: me~
2007-01-08 4:51 am
1. D
2. D
2. D
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