Change is Inevitable

Dr. Forrester introduces physical and chemical changes using relatable examples. Physical changes, like breaking a vase or melting ice, alter the form but not the substance. Chemical changes, such as wood burning or rusting steel wool, create new substances. The video includes experiments to illustrate these concepts, emphasizing the differences between physical and chemical changes.

What is a physical change?

• A change that alters the chemical composition of a substance

• A change in size, shape, or state of matter without changing the substance's composition

• A change that involves the release of energy in the form of light or heat

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

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

• Rusting of iron

• Cooking an egg

• Burning wood

• Melting ice

What happens to the ice cube in the experiment?

• It changes into a gas

• It remains a solid

• It changes into a liquid

• It changes into a new substance

What is a chemical change?

• A change that does not involve energy

• A change that can be easily reversed

• A change that involves a new substance being formed

• A change that alters the physical appearance of a substance

Which of the following is an indicator of a chemical change?

• Change in shape

• Change in state

• Change in temperature

• Change in size

What happens to the steel wool when it is placed in vinegar?

• It turns blue

• It remains unchanged

• It turns orange and rusts

• It dissolves completely

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

• Deflating a basketball

• Lighting a match

• Crumpling aluminum foil

• Cutting paper