FREE Physical Chemistry Questions and Answers

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What is the unit of the rate constant for a first-order reaction?

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The rate constant for a first-order reaction has units of time inverse (s⁻¹) because the rate depends only on the concentration of a single reactant.

Which law relates the pressure, volume, and temperature of an ideal gas?

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The ideal gas law, PV = nRT, relates pressure, volume, and temperature, along with the number of moles and the gas constant.

What is the enthalpy change for a reaction at constant pressure called?

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The enthalpy change at constant pressure is referred to as the heat of reaction or ΔH, representing the energy absorbed or released during a chemical reaction.

What is the term for the measure of disorder in a system?

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Entropy is a thermodynamic property that measures the disorder or randomness in a system, often denoted as S.

Which of the following processes is exothermic?

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Condensation is an exothermic process, as it releases heat when a gas changes into a liquid.

What is the significance of a catalyst in a chemical reaction?

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A catalyst increases the rate of a reaction by lowering the activation energy without being consumed in the process.