Thermochemistry | First Year Chemistry Past Papers MCQs | mosaicbro.com

Thermochemistry | First Year Chemistry Past Papers MCQs

7 of 38 questions (Page 3 of 6)

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15 Whenever a reaction is endothermic, then it means that:
Correct Answer: A
Explanation: Endothermic reactions absorb heat (ΔH > 0) from surroundings.
16 The number of fundamental ways for transferring energy into or out of system is:
Correct Answer: B
Explanation: Energy transfer occurs via heat (q) or work (w).
17 Work is product of force and:
Correct Answer: C
Explanation: Work = Force × Displacement (W = F·Δx).
18 The enthalpy change of a reaction when all the reactants and products are in their standard states is called:
Correct Answer: A
Explanation: Standard enthalpy change (ΔH°) refers to reactants/products in standard states.
19 The enthalpy change when one mole of a compound is formed from its elements in their standard states is called:
Correct Answer: B
Explanation: Standard enthalpy of formation (ΔH°f) is defined for compound formation from elements.
20 The apparatus used to measure heat changes at constant volume is called:
Correct Answer: B
Explanation: Bomb calorimeters measure ΔE at constant volume for combustion reactions.
21 The heat change at constant pressure is equal to:
Correct Answer: B
Explanation: At constant pressure, qₚ = ΔH (enthalpy change).
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