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What are irreversible materials?
melting choalate,melting ice ,dissolving salt in water
How does the instant ice trick work?
A warm, saturated sodium acetate solution is allowed to cool. At the lower temperature the solution is supersaturated, meaning that more of a salt is dissolved in the water than would normally be possible. I the solution is disturbed the sodium acetate crystallizes instantly.
Why does salt ice melt slower than ice with no salt?
The freezing point of water is lower with added salts; the heat of solution is released.
Why it is preferable to allow the hot solution to cool gradually instead of chiling immediately in an ice -bath?
If you cool too quickly, a saturated solution at a higher temperature can 'crash' out of solution.
What happens when salt is added to ice?
If the ice is above a certain temperature, the salt will cause the ice to melt by lowering its melting point. The ice will absorb sensible heat as it melts, which means that the temperature of the solution will drop. If the temperature of the solution drops too low, the ice will stop melting unless it can absorb more heat from its surroundings.
How does ice melt faser on salt than plain ice?
The process of dissolving salt lowers the freezing point of the solution. So putting salt on the ice starts this process of dissovling, which creates a solution which will not freeze until a much lower temperature. Plain ice -- no solution.
What are examples of melting ice and dissolving salt in water?
Ice melting in a glass, salt in the ocean
How does salt make ice melt faster?
The salt dissolving in the water creates heat which then melts the ice.
Effect of common salt on ice?
Dissolving a salt (NaCl, CaCl2) in water the heat of dissolution is released and the melting point of ice is then decreased.
How can you change the melting point of ice?
By dissolving something in it, like salt or sugar.
What are irreversible materials?
melting choalate,melting ice ,dissolving salt in water
What is the role of ice bath in preparation of double salt?
The coldness of the ice precipitates the salt out of the solution.
Why should you use rock salt rather than regular table salt to make homemade ice cream?
Table salt has more artificial chemicals then natural rock salt. This really has nothing to do with it since the salt is never in contact with the ice cream. While rock salt is ideal, you can use table salt if needed. You can also make your own rock salt by heating some water, then dissolving as much salt in it as allowed. Heat the water until boiled. When the boiling water has become a saturated solution and cannot dissolve any more salt, remove the water from the stove and let it cool. As the water evaporates from the solution, the salt will form crystals. You can then crush the crystals, and you've got rock salt. It is usually preferable to use rock salt, because table salt is a finer grain. It dissolves quicker and effects the brine. The brine pulls heat from the batter. If the salt dissolves in the brine too quickly, it will drop the temperature of the batter too quickly. This will cause ice crystals to form in the ice cream, and a gritty texture may occur.
Why must the salt stirred into the ice water?
Probably to cause the water it to be saturated without using as much salt as it would take to make room temperature water saturated.
What makes dry ice and cola react?
Dry ice is solid carbon dioxide (CO2); cola is a super-saturated solution of carbon dioxide (and other things). If you add a crystal of salt to a supersaturated salt solution, the extra salt dissolved in the water will start crystallizing around that "seed" crystal you added and come out of solution. Relatedly, when you add solid/gaseous pure CO2 to a supersaturated CO2 solution, the extra dissolved CO2 will start coming out of solution, prompted by the addition of pure CO2.
How does the instant ice trick work?
A warm, saturated sodium acetate solution is allowed to cool. At the lower temperature the solution is supersaturated, meaning that more of a salt is dissolved in the water than would normally be possible. I the solution is disturbed the sodium acetate crystallizes instantly.
How does adding salt to water affect it freezing point?
Adding salt to water increases its density and lowers its freezing point. ---------------------- I've just completed a repeated experiment on the effects of salt and the freezing point of water. A saturated salt solution will not freeze at -15 degrees Celsius (my freezer temperature). At exactly -21.1 degrees Celsius the salt begins to crystallize out of the solution, along with the ice, until the solution completely freezes.
