Physical and Chemical Changes

Can a physical change be reversed?

• Yes, many physical changes can be reversed, such as melting and freezing.

• No, physical changes are always permanent.

• Yes, but only in certain conditions.

• No, once a physical change occurs, it cannot be undone.

What is an example of an irreversible chemical change?

• Burning wood is an example of an irreversible chemical change.

• Dissolving sugar in water is an example of an irreversible chemical change.

• Melting ice is an example of an irreversible chemical change.

• Mixing vinegar and baking soda is an example of an irreversible chemical change.

Why is it important to understand physical and chemical changes?

• It helps us to comprehend how substances interact and transform in our everyday lives.

• It allows us to memorize the periodic table more easily.

• It is only relevant for chemistry students and professionals.

• It has no real-world applications.

What is an example of a chemical change?

• Melting ice

• Exploding fireworks

• Dissolving sugar in water

• Boiling water

What is the role of energy in chemical changes?

• Energy is always released during chemical changes.

• Energy is often absorbed or released during chemical changes, which can cause changes in temperature or light.

• Energy has no effect on chemical changes.

• Energy is only absorbed in exothermic reactions.

What is an example of a physical change?

• Hammering wood to build a treehouse is an example of a physical change.

• Burning wood to create ash is an example of a physical change.

• Dissolving sugar in water is an example of a physical change.

• Melting ice to form water is an example of a physical change.

What is a physical change?

• A change that alters the chemical composition of a substance.

• A change that affects one or more physical properties of a substance without altering its chemical composition.

• A change that only occurs at high temperatures.

• A change that results in the formation of a new substance.

What is a chemical change?

• A change that results in the formation of new chemical substances.

• A physical change that alters the appearance of a substance.

• A process that only involves the mixing of different substances.

• A change that can be easily reversed without any new substances formed.

What is the difference between physical and chemical changes?

• Physical changes alter the chemical composition of a substance, while chemical changes do not.

• Physical changes do not change the chemical composition of a substance, while chemical changes do.

• Both physical and chemical changes result in new substances being formed.

• Physical changes are reversible, while chemical changes are not.

Is freezing juice a physical or chemical change?

• A chemical change

• A physical change

• A biological change

• A thermal change