Chemical and Physical Changes Assessment

The video tutorial explains the differences between physical and chemical changes. Physical changes involve alterations in size, shape, or state without changing the substance itself, such as tearing paper or melting ice. Chemical changes result in a new substance, like burning paper to ash. Indicators of chemical changes include color change, gas production, and temperature change. The video concludes with a review of these concepts.

What is a physical change?

• A change in size, shape, or state without forming a new substance

• A change that cannot be reversed

• A change that results in a new substance

• A change that involves a chemical reaction

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

• Baking a cake

• Burning wood

• Rusting iron

• Melting ice

What happens to water when it evaporates?

• It remains unchanged

• It changes from a liquid to a gas

• It becomes a new substance

• It turns into a solid

What defines a chemical change?

• A change that results in a new substance

• A change in color

• A change in temperature

• A change in state

Which of the following is a sign of a chemical change?

• Change in shape

• Change in size

• Change in color

• Change in state

What is produced when paper is burned?

• Liquid water

• Solid ice

• Black ash

• White ash

Which of the following indicates a chemical change?

• A substance melting

• A substance freezing

• A gas being released

• A substance evaporating

What happens when a glow stick is activated?

• It melts

• It becomes cold

• It produces light

• It changes color

What is the main difference between physical and chemical changes?

• Physical changes create new substances

• Chemical changes are reversible

• Chemical changes do not involve energy

• Physical changes do not create new substances

Which of the following is NOT an indicator of a chemical change?

• Change in state

• Production of gas

• Change in temperature

• Change in color