I hate to nitpick, but isn't dissolving a physical change? You mix table salt into water, then evaporate all the water and you'll still have table salt. If it were a chemical reaction, then a new compound would have to be created.
Dissolving salts into water raises the boiling point of water and lowers the freezing point. I believe calcium chloride lowers the freezing point more than NaCl would and is why it is more effective at dealing with ice.
I always loved chemistry in college is high school.
No quite correct, JD.
Is mixing calcium chloride and water a chemical reaction?
Answer YES
CaCl2(aq) + H2O(aq) = 2HCl(aq) + CaO(s)
You con't get CaCl2 back.
More importantly for melting snow: the reaction is exothermic giving off HEAT.
(thermometer is in Celsius)
Last edited by PRBuzz; 02-07-2011 at 02:41 PM..
Given the diversity of the human species, there is no “normal” human genome sequence. We are all mutants.
Given the diversity of the human species, there is no “normal” human genome sequence. We are all mutants.
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