Exothermic

The video explains exothermic reactions, which release heat. It uses burning coal and wood as examples, highlighting that these reactions release more energy when forming new chemical bonds than is needed to break the bonds in the reactants. This excess energy is emitted as heat.

What is an exothermic reaction?

• A reaction that absorbs heat

• A reaction that releases heat

• A reaction that requires light

• A reaction that produces sound

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

• Melting ice

• Burning coal

• Evaporating water

• Photosynthesis

What happens to the energy during the formation of new chemical bonds in an exothermic reaction?

• Energy is converted to light

• Energy remains constant

• Energy is released

• Energy is absorbed

In an exothermic reaction, how does the energy required to break bonds in reactants compare to the energy released?

• More energy is required to break bonds

• Energy required is negligible

• Less energy is required to break bonds

• Energy required and released are equal

What is the result of the excess energy in an exothermic reaction?

• It is converted to sound

• It is absorbed by the surroundings

• It is released as heat

• It is stored in the products