Exploring Physical and Chemical Changes

What is a physical change?

• A change that cannot be reversed

• A change where a new substance is created

• A change in appearance without creating a new substance

• A change where chemical bonds are broken

Which of the following is a physical change?

• Dissolving sugar in water

• Cooking vegetables

• Decomposing water into hydrogen and oxygen

• Burning wood

Which example illustrates a physical change?

• Cooking an egg

• Rusting of iron

• Mixing salt and water

• Burning paper

What does it mean if a mixture can be separated?

• It is a compound

• It has undergone a chemical change

• It is a homogeneous mixture

• It has undergone a physical change

What happens during a chemical change?

• It is easily reversible

• Only physical appearance changes

• A new substance is formed

• No new properties emerge

What is an indicator of a chemical change?

• Change in size

• Change in position

• Change in shape

• Bubbles or fizzing

Which is NOT an indicator of a chemical change?

• Temperature change without external heating

• Change in color

• Separation into components

• Emission of light or heat