You are making homemade ice cream and can use either 200 g Ice Melt (CaCl2) or 200 g rock salt (NaCl) to lower the freezing point of 7.00 kg of ice (assume the ice is pure water). Which salt would help you eat your ice cream faster (i.e. lower the freezing temperature of the ice)? NaCl CaCl2 What is the lowered freezing point of the ice? *use "degC" for °C *ΔTf = KfCmi *Kf(water) = -1.86 °C/m
Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
You are making homemade ice cream and can use either 200 g Ice Melt (CaCl2) or 200 g rock salt (NaCl) to lower the freezing point of 7.00 kg of ice (assume the ice is pure water). Which salt would help you eat your ice cream faster (i.e. lower the freezing temperature of the ice)?
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NaCl |
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CaCl2 |
What is the lowered freezing point of the ice?
*use "degC" for °C
*ΔTf = KfCmi
*Kf(water) = -1.86 °C/m
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