ThermoChem Quiz

What is the standard enthalpy change of a reaction?

• The heat absorbed or evolved under standard conditions when one mole of compound is formed from its elements

• The heat absorbed or evolved when one mole of a compound reacts under standard conditions

• The heat absorbed or evolved under standard conditions when one mole of compound is decomposed into its elements

• The total heat content of the products minus the total heat content of the reactants under standard conditions

• The enthalpy change of a reaction

• The feasibility a reaction

• The entropy change of a reaction

• The heat capacity of a substance

What does the enthalpy of formation refer to?

• The change in enthalpy when one mole of a compound is formed from its elements in their standard states

• The change in enthalpy when one mole of a compound decomposes into its elements

• The total enthalpy of a system at equilibrium

• The change in enthalpy when one mole of a compound reacts with one mole of another compound

What is the unit of heat capacity?

In a chemical reaction, if the entropy of the system increases and the enthalpy decreases, the reaction is:

• Always non-spontaneous

• Always spontaneous

• Spontaneous at high temperatures

• Spontaneous at low temperatures

• The reaction is at equilibrium

• The reaction is non-spontaneous

• The reaction is spontaneous

• The reaction absorbs heat

• It is exothermic

• It is endothermic

• It is spontaneous

• It is at equilibrium

Which of the following is true for a reaction at thermodynamic equilibrium?

What is the main difference between heat capacity and specific heat capacity?

• Heat capacity depends on the amount of substance, while specific heat capacity does not

• Specific heat capacity depends on the temperature change, while heat capacity does not

• There is no difference; they are the same