Energy Graphs & Chemical Reactions

What does the y-axis represent in energy graphs for chemical reactions?

• Reaction coordinate

• Time

• Potential energy

• Activation energy

In an exothermic reaction, what happens to the energy as the reaction progresses?

• Energy is absorbed.

• Energy remains constant.

• Energy is released.

• Energy increases.

What does the 'hump' in the energy graph represent?

• The energy released during the reaction.

• The activation energy required to start the reaction.

• The time taken for the reaction to complete.

• The difference in energy between reactants and products.

What is the enthalpy change (ΔH) in an endothermic reaction?

• ΔH = 0

• ΔH < 0

• ΔH > 0

• ΔH = -Ea

Which of the following is true for the products in an exothermic reaction?

• They have higher energy than the reactants.

• They have lower energy than the reactants.

• They have the same energy as the reactants.

• They absorb energy from the surroundings.

What does the x-axis represent in energy graphs for chemical reactions?

• Potential energy

• Course of reaction

• Activation energy

• Time

What is the key difference between endothermic and exothermic reactions in terms of energy?

• Endothermic reactions release energy, while exothermic reactions absorb energy.

• Endothermic reactions absorb energy, while exothermic reactions release energy.

• Both reactions release energy.

• Both reactions absorb energy.

What is the starting energy level in a chemical reaction called?

• Products

• Reactants

• Activation energy

• Enthalpy change

What is the ending energy level in a chemical reaction called?

• Reactants

• Products

• Activation energy

• Reaction coordinate

What does ΔH represent in energy graphs?

• The activation energy required to start the reaction.

• The difference in energy between reactants and products.

• The time taken for the reaction to complete.

• The potential energy of the reactants.