10-2 The Role of Energy

Front

What is the heat of reaction in a chemical reaction?

Back

The heat of reaction is equal to the potential energy of the products minus the potential energy of the reactants.

Front

What does a potential energy diagram represent in a chemical reaction?

Back

A potential energy diagram shows the potential energy of reactants and products, illustrating the energy changes during the reaction.

Front

What does Interval 4 represent in a potential energy diagram?

Back

Interval 4 represents the difference between the potential energy of the products and the potential energy of the reactants.

Front

How does a catalyst affect a chemical reaction?

Back

A catalyst lowers the activation energy, affecting the intervals that represent the energy barrier for the reaction.

Front

What characterizes an exothermic reaction in a potential energy diagram?

Back

In an exothermic reaction, the potential energy of the products is lower than that of the reactants, indicating that energy is released.

Front

What is the balanced equation for the combustion of hydrogen?

Back

2H₂(g) + O₂(g) → 2H₂O(l) + 571.6 kJ.

Front

What is potential energy?

Back

Potential energy is the stored energy in a system due to its position or configuration.

Front

What is the difference between potential energy and kinetic energy?

Back

Potential energy is stored energy, while kinetic energy is the energy of motion.

Front

What is activation energy?

Back

Activation energy is the minimum energy required for a chemical reaction to occur.

Front

What is the role of energy in chemical reactions?

Back

Energy is involved in breaking bonds in reactants and forming new bonds in products.