Question

A lot of heat energy is usually absorbed or given out during a physical change

• A. True
• B. False

Answer 1

The correct option is B False

Physical change: It is a type of change in which there is no change in the chemical properties of the substance and no new substance is formed.

• It is a type of reversible change
• Reversible change: It is a type of change that can be reversed easily.
• For example, melting of ice, freezing of water, etc.
• No lot of heat energy is absorbed or given during this type of change.
• A lot of heat energy is absorbed or given during chemical change.

Chemical change: It is a type of change in which there is a change in the chemical properties of the substance, and a new substance is formed.

• It is a type of irreversible change
• Irreversible change: It is a type of change that cannot be reversed.
• Heat can be released or absorbed in this type of reaction.
• For example, Magnesium($\mathrm{Mg}$) when reacted with oxygen(${\mathrm{O}}_2$) results in the production of magnesium oxide($\mathrm{MgO}$), and energy is released in the form of heat and light.
• $\underset{\mathrm{Magnesium}}{\mathrm{Mg}\left(\mathrm{s}\right)}+\underset{\mathrm{Oxygen}}{{\mathrm{O}}_2\left(\mathrm{g}\right)}\to \underset{\mathrm{Magnesium}\mathrm{oxide}}{\mathrm{MgO}\left(\mathrm{s}\right)}+\mathrm{light}+\mathrm{Heat}$

Therefore, the given statement is false.