A 10-g ice cube, initially at 0ºC, is melted in 100 g of water that was initially 20ºC. After the ice has melted, the equilibrium temperature is 10.93 ºC. Calculate The total heat lost by the water (the specific heat for water is 4.186 J/g·°C) .The heat gained by the ice cube after it melts (the specific heat for ice is 2.093 J/g·°C). The heat it took to melt the ice (Hint: It takes 334 J of heat energy to melt 1 g of ice).
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.
- A 10-g ice cube, initially at 0ºC, is melted in 100 g of water that was initially 20ºC. After the ice has melted, the equilibrium temperature is 10.93 ºC. Calculate
- The total heat lost by the water (the specific heat for water is 4.186 J/g·°C)
- .The heat gained by the ice cube after it melts (the specific heat for ice is 2.093 J/g·°C).
- The heat it took to melt the ice (Hint: It takes 334 J of heat energy to melt 1 g of ice).
Inside a calorimeter is 100 g of water at 39.8ºC. A 10-g object at 50ºC is placed inside the calorimeter. When equilibrium has been reached, the new temperature of the water and metal object is 40ºC. What type of metal is the object made from? Hint: Use Table 1 in the Introduction for reference
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