Front

What is bond energy?

Back

Bond energy is the amount of energy required to break one mole of a bond in a molecule in the gas phase.

Front

What is an endothermic reaction?

Back

An endothermic reaction is a chemical reaction that absorbs energy from its surroundings, usually in the form of heat.

Front

What is an exothermic reaction?

Back

An exothermic reaction is a chemical reaction that releases energy to its surroundings, usually in the form of heat.

Front

Does breaking bonds require energy or release energy?

Back

Breaking bonds requires energy.

Front

Does forming bonds require energy or release energy?

Back

Forming bonds releases energy.

Front

What is the relationship between bond energy and stability of a molecule?

Back

Higher bond energy indicates stronger bonds and greater stability of the molecule.

Front

How can you determine if a reaction is endothermic or exothermic from a graph?

Back

In an endothermic reaction graph, the products are at a higher energy level than the reactants. In an exothermic reaction graph, the products are at a lower energy level than the reactants.

Front

What is the significance of the activation energy in a chemical reaction?

Back

Activation energy is the minimum energy required for a reaction to occur; it determines the rate of the reaction.

Front

What does a negative change in enthalpy (ΔH) indicate?

Back

A negative change in enthalpy indicates that the reaction is exothermic.

Front

What does a positive change in enthalpy (ΔH) indicate?

Back

A positive change in enthalpy indicates that the reaction is endothermic.