Enthalpy Change Quiz

What is enthalpy change?

• The enthalpy change is the volume change during a chemical reaction or physical change.

• The enthalpy change is the temperature change during a chemical reaction or physical change.

• The enthalpy change is the mass of a substance in a chemical reaction.

• The enthalpy change is the heat energy transferred during a chemical reaction or physical change.

Define enthalpy of reaction.

• Change in temperature.

• Change in heat energy

• Change in pressure.

• Change in volume.

What is the symbol used to represent enthalpy change?

• ΔH

• E

• ΔE

• H

The breaking of bonds in an _______ process.

• Exothermic

• Endothermic

What is the standard unit of measurement for enthalpy change?

• Joules (J)

• Seconds (s)

• Meters (m)

• Kilograms (kg)

What is the formula to calculate enthalpy change?

• ΔH = Hfinal + Hinitial

• ΔH = Hfinal * Hinitial

• ΔH = Hfinal - Hinitial

• ΔH = Hfinal / Hinitial

What does a positive enthalpy change indicate?

• No change in energy.

• Exothermic reaction.

• Endothermic reaction

• Equilibrium reaction.

What does a negative enthalpy change indicate?

• Equilibrium reaction.

• Endothermic reaction.

• Exothermic reaction

• No change in enthalpy.

What is the enthalpy change for an exothermic reaction?

• Positive

• Zero

• Undefined

• Negative

What is the enthalpy change for an endothermic reaction?

• Negative.

• Zero.

• Undefined.

• Positive