Which of the following statement is false:
Correct answer: D. Energy needed to raise the temperature of substance by 1°C is specific heat.
- A. Thermochemistry is the study of relation between heat energy and chemical reactions
- B. An exothermic reaction is one which is accompanied by evolution of heat
- C. An endothermic reaction is one in which heat is absorbed
- D. Energy needed to raise the temperature of substance by 1°C is specific heat.
Explanation
The false statement is Energy needed to raise the temperature of a substance by 1°C is specific heat. Specific heat is the amount of heat energy required to raise the temperature of 1 gram of a substance by 1°C. So, the energy needed to raise the temperature of a substance by 1°C is not specific heat, but rather the product of specific heat and mass.
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About Thermochemistry and Energetics of Chemical Reactions
Thermochemistry measures energy changes in chemical reactions and distinguishes exothermic from endothermic processes. Work covers systems, surroundings and state functions, internal energy, the first law of thermodynamics, enthalpy and Hess's law, including the sign conventions used when heat enters or leaves a system.
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