Visualizing Energy Changes in Chemical Reactions through Reaction Profiles

The video tutorial explains reaction profiles and energy changes in chemical reactions. It covers energy conservation, exothermic and endothermic reactions, and their examples and uses. Exothermic reactions release energy to the surroundings, while endothermic reactions absorb energy. Examples include combustion and decomposition reactions, with applications like self-heating cans and sports-injury packs.

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

• The product molecules have more energy than the reactants.

• The product molecules have less energy than the reactants.

• The energy of the product molecules remains unchanged.

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

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

• Kinetic energy

• Potential energy

• Activation energy

• Thermal energy

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

• Decomposition of water

• Combustion of wood

• Photosynthesis

• Reaction between citric acid and sodium bicarbonate

During an endothermic reaction, what happens to the energy of the surroundings?

• Energy is released to the surroundings.

• Energy is converted into activation energy.

• Energy is absorbed from the surroundings.

• Energy remains constant in the surroundings.

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

• Self-heating cans

• Hand warmers

• Sports-injury packs

• Combustion engines