Front

What is bond energy?

Back

Bond energy is the amount of energy required to break one mole of a bond in a gaseous substance.

Front

What is the difference between endothermic and exothermic reactions?

Back

Endothermic reactions absorb energy from the surroundings, while exothermic reactions release energy to the surroundings.

Front

What does ΔH represent in a chemical reaction?

Back

ΔH represents the change in enthalpy, indicating the heat absorbed or released during a reaction.

Front

What is an example of an exothermic reaction?

Back

Combustion of fuels, such as burning wood or gasoline, is an example of an exothermic reaction.

Front

What is an example of an endothermic reaction?

Back

Photosynthesis in plants is an example of an endothermic reaction, as it absorbs energy from sunlight.

Front

How can you tell if a reaction is exothermic from its ΔH value?

Back

If ΔH is negative, the reaction is exothermic, indicating that energy is released.

Front

How can you tell if a reaction is endothermic from its ΔH value?

Back

If ΔH is positive, the reaction is endothermic, indicating that energy is absorbed.

Front

What happens to temperature in an endothermic reaction?

Back

The temperature of the surroundings decreases as the reaction absorbs heat.

Front

What happens to temperature in an exothermic reaction?

Back

The temperature of the surroundings increases as the reaction releases heat.

Front

What is the significance of bond energy in chemical reactions?

Back

Bond energy helps predict whether a reaction will be endothermic or exothermic based on the bonds broken and formed.