e of unknown metal Mass of cup and water: 170.54 g Mass of cup: 6.83 g Initial temperature of water: 24.0OC Final temperature of water: 26. 0OC Mass of unknown metal: 21.95g Initial temperature of unknown metal: 100.0OC Final temperature of unknown metal: 26.0OC Questions: 1. Calculate the heat gained by the water in the calorimeter. Note that the temperature of the cup did not change. 2. Calculate the specific heat of the unknown metal, usin
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.
Examine the experimental data below:
1st type of unknown metal
Mass of cup and water: 170.54 g
Mass of cup: 6.83 g
Initial temperature of water: 24.0OC
Final temperature of water: 26. 0OC
Mass of unknown metal: 21.95g
Initial temperature of unknown metal: 100.0OC
Final temperature of unknown metal: 26.0OC
Questions:
1. Calculate the heat gained by the water in the calorimeter. Note that the temperature of the cup did not change.
2. Calculate the specific heat of the unknown metal, using the heat gained=-heat lost equation.
3. Look up for the list of specific heat values of some metals in the internet. Compare your experimental specific heat value to other metals’ specific heat. What do you think is the name of the unknown metal?
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