52. A 6.22-kg plece of copper metal is heated from 205 C to 324.3 C.Calculate the hout aboobed Gin kJ) by the metal. a. 727.37 kJ c. 327.70 kJ b. 7.27 kJ d. 3.28 k] 53. Calculate the amount of heat liberated (in kJ) from 366 g of mercury when it cools from 77.0 C to 12.0 °C. a 3.31 kJ b.-3.31 kJ 54. What is the sign convention for work done by the system on the surroundings? c. 3306 kJ d-3306 kJ a + b. - C. +or-d. cannot be determined 55. It states that energy can be converted from one to another but cannot be created nor destroyed. a. Zeroth Law of Thermodynamics c. Second Law of Thermodynamics 56. Metal and its compounds are examples of pollutants. b. natural organic 57. Which factor greatly affects the availability of nutrient ions for plants? b. color c. humidity b. First Law of Thermodynamics d. Law of Conservation of Mass -- a. inorganic C. synthetic organic d. all of the above a. pH d. hardness 58. A ll the following are macronutrients except: с. К a. С b. H d. Co 59. All of the following are chemical indicators of water quality except b. TDS с. рH d. color a. BOD 60. How much organic matter is usually present in soil? b. 25% C. 5% d. 15% а. 45%
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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