1. In the laboratory of an educational institution there is a calorimeter like the one shown in the figure. The masses of the water and of block A are equal. Block A is placed in the calorimeter at a temperature higher than that of water. The heat transfer is carried out from: A. Block towards the water B. Water to the block C. Water to the outside environment D. Environment outside the water. 2. Taking into account question 1. The heat transfer is carried out from: A. Half of the water B. Same as water C. Double that of water D. Null 3. The attached graph shows the increase in temperature with the absorbed heat of an unknown substance. The boiling temperature of this substance is: A. T1 B. T2 C. T3 D. T4
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.
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