Figures....sold out everywhere.... Maybe could order from their dealer in Poland
Or I could ask Paul to make up the business end and stick some conduit to it....
“Americans have the right and advantage of being armed, unlike the people of other countries, whose leaders are afraid to trust them with arms.” – James Madison.
I have electric heat wires on the roof and in the gutters.. i rake after every snow fall... I have the only house on the street with out ice dams....
the reason for CaCl is because it relies on a chemicle reaction to work ( just add water) rock salt requires help from the sun and warmer temps...
My lawn is crab grass.... i couldnt kill it if I wanted to...
Rock salt is Sodium Chloride - NaCl. Calcium Chloride is CaCl2. When NaCl dissolves, there are two ions - one of Na and one of Cl. When CaCl2 dissolves, there are three ions, one of Ca and two of Cl. That's why Calcium Chloride works better. Both are chemical reactions - they lower the temperature at which water freezes - so they cause ice to melt as long it the temperature is above the new freezing temp.
Rock salt is Sodium Chloride - NaCl. Calcium Chloride is CaCl2. When NaCl dissolves, there are two ions - one of Na and one of Cl. When CaCl2 dissolves, there are three ions, one of Ca and two of Cl. That's why Calcium Chloride works better. Both are chemical reactions - they lower the temperature at which water freezes - so they cause ice to melt as long it the temperature is above the new freezing temp.
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.
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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