hich of the following statements is false? a. Thermochem acThermo chemistry invo

Question

hich of the following statements is false? a. Thermochem acThermo chemistry invoives the study of the quantity of heat absorbed or evolved in chemical reactions b. Heat is the energy that flows into or out of a thermodynamic system because of a difference in temperature between the system and its surroundings. c) An extensive property is independent of the amount of substances in the system. d. Endothermic processes absorb heat. e. None of the above. For exothermic reactions, which of the following statements is false? a. Reaction vessel warms up. b. Heat is given off c. The sign of q is negative. d. Energy is added to the system. e. None of the above is false. The quantity of heat needed to raise the temperature of one gram of a substance 1°C at constant pressure is called a. Calorie b. Enthalpy c. Entropy d. Specific heat e. Heat capacity What is the quantity of heat evolved when 200. g H20() is formed from the combustion of H2(g) and O2(g)? aH=-285.9 kJ Ha(g) + ½ O2(g) H2O(l) a. 285.8 kJ b. 1590 kJ c. 3170 kJ d. 4360 kJ e. None of the above

Explanation / Answer

Ans 1

Option C is the correct answer

Option C has false statement because

Extensive property depends on the mass of substance

Ans 2

Exothermic reactions are the reactions from which heat is released

Option D is the correct answer

Energy added into the system is called endothermic

Ans 3

Specific heat is the heat added to raise the temperature of one gram of a substance 1°C at constant pressure

Ans 4

H = 285.9 kJ

Option A is the correct answer

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