Using the relationship Emetal + Ewater = 0, determine the specific heat capacity of the unknown metal sample. Use proper sample calculation formatting Using the table of specific heat capacities handout, determine the most likely identity of the unknown metal sample.
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.
Mass of empty beaker = 50.45 g
Mass of water = 30.81 g
Mass of beaker and water = 81.26 g
Initial water temperature = 25.5 C
Mass of metal = 54.02 g
Initial metal temperature = 102.5 C
Final water and metal mixture temperature = 36.0 C
NOTE: The specific heat capacity of water is 4184 J/kg˚C.
- Using the relationship Emetal + Ewater = 0, determine the specific heat capacity of the unknown metal sample. Use proper sample calculation formatting
- Using the table of specific heat capacities handout, determine the most likely identity of the unknown metal sample.
- The biggest source of error in this investigation occurred when transferring the hot metal sample to the room temperature water. When the block was removed from the boiling water, it was held in the air for a few seconds as water dripped from its surface. This caused heat to move from the metal block to the air, before it was placed in the small beaker of water. How would this particular source of error affect:
- A) the measurement of the equilibrium temperature; and
- B) the calculation of the specific heat capacity value?
NOTE: The specific heat capacity of water is 4184 J/kg˚C.
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