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science

2007-10-04 5:57 am

Please answer and give explanation

For some cocktails, take 500 ml distilled water from the fridge and also 500 ml of pure alcohol. Both fluids have a temperature of 7 degrees Celsius. What happens when you mix both fluids with the total volume (is it 1000ml ?) and the temperature (is it 7 degrees )?

A. volume lower, temperature lower
B. volume 1000 ml, temperature lower
C. volume 1000 ml, temperature higher
D. volume lower, temperature higher

回答 (1)

Carson

2007-10-10 6:37 pm

✔ 最佳答案

A. volume lower, temperature lower
Because the molecules of water and alcohol is not of same size, after mixing, some water molecules will go into the previous spaces between alcohol molecules and the total volume will decrease.
The reaction (mixing) of distilled water and pure alcohol is endothermic.
I hope this can help your understanding. :)

2007-10-10 20:19:53 補充：
Sorry, I have make a mistake about the reaction (mixing) of distilled water and pure alcohol.It is exothermic (give out energy)So the answer is D. volume lower, temperature higher 　　　　　　　－－－－－－－－－－－－－－－－

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