Visualizing Energy Changes in Chemical Reactions through Reaction Profiles

The video explains reaction profiles, which illustrate energy changes during chemical reactions. It covers energy conservation, exothermic reactions where energy is released, and endothermic reactions where energy is absorbed. Examples and uses of both reaction types are provided.

What happens to the energy of product molecules if energy is transferred to the surroundings during a chemical reaction?

• The energy of the product molecules is equal to the activation energy.

• The energy of the product molecules remains unchanged.

• The product molecules have less energy than the reactants.

• The product molecules have more energy than the reactants.

In an exothermic reaction, what is the term used for the initial energy required to start the reaction?

• Thermal energy

• Potential energy

• Activation energy

• Kinetic energy

Which of the following is an example of an exothermic reaction?

• Photosynthesis

• Combustion

• Melting of ice

• Decomposition of water

During an endothermic reaction, what happens to the energy of the product molecules compared to the reactants?

• The product molecules have less energy than the reactants.

• The product molecules have more energy than the reactants.

• The energy of the product molecules remains unchanged.

• The energy of the product molecules is equal to the activation energy.

Which of the following is a practical application of an endothermic reaction?

• Self-heating cans

• Hand warmers

• Sports-injury packs

• Combustion engines