The video lesson introduces Year 5 students to the concept of changes in materials, focusing on physical and chemical changes. Physical changes are reversible, meaning the material can return to its original state, while chemical changes are irreversible, creating a new material. The lesson provides examples of each type of change, such as melting ice for physical changes and baking a cake for chemical changes. Students are encouraged to create a T-chart to categorize changes and participate in a home activity to demonstrate their understanding.

What is the main difference between physical and chemical changes?

• Physical changes can be reversed, while chemical changes cannot.

• Chemical changes do not create new materials.

• Chemical changes can be easily reversed.

• Physical changes alter the material's internal structure.

Which of the following is an example of a physical change?

• Baking a cake

• Melting ice

• Rusting iron

• Burning wood

What happens to the material during a physical change?

• Its internal structure is altered.

• It becomes a completely new material.

• Its appearance or state changes, but it remains the same material.

• It cannot be reversed.

What is a common feature of physical changes?

• They involve a chemical reaction.

• They are permanent.

• They create new substances.

• They can be reversed.

Why is rusting considered a chemical change?

• It only affects the surface of the metal.

• It involves a change in the material's internal structure.

• It changes the color of the metal.

• It can be reversed by removing the rust.

Which process is an example of a chemical change?

• Frying an egg

• Cutting paper

• Boiling water

• Freezing water

Which of the following is NOT a characteristic of a chemical change?

• It can be undone by physical means.

• It creates a new material.

• It involves a change in the material's internal structure.

• It is irreversible.

Which example illustrates a reversible change?

• Burning paper

• Rusting a nail

• Baking bread

• Melting chocolate

Which of the following changes is irreversible?

• Freezing juice

• Boiling water

• Cooking an egg

• Melting butter

What is the purpose of the hands-on activity in the lesson?

• To memorize the definitions of changes

• To create new chemical reactions

• To practice identifying and categorizing changes

• To learn how to cook