Chemical and Physical Changes in Matter

Multiple Choice

Which of the following best describes a chemical change?

• A change that creates something new with different properties

• A change that only alters the appearance

• A change that can be easily reversed

• A change that does not involve any new substances

Multiple Choice

How does a chemical property differ from a physical property?

• A chemical property describes the ability to change into a new substance, while a physical property does not.

• A chemical property can be observed without changing the substance, while a physical property cannot.

• A chemical property is always visible, while a physical property is not.

• A chemical property only applies to solids, while a physical property applies to all states.

Open Ended

Explain how the Law of Conservation of Mass applies when wood is burned in a fire, as shown in the example.

Fill in the Blank

Fill in the blank: Thermal energy is the energy that comes from ___.

Multiple Choice

Which of the following statements about precipitate formation is correct?

• A precipitate forms when two liquid solutions combine to create a solid.

• A precipitate forms when a gas is released from a liquid.

• A precipitate forms when a solid melts into a liquid.

• A precipitate forms when a liquid evaporates.

Multiple Select

Select all the changes that are considered physical changes.

• Change in size

• Change in color

• Change in shape

• Change in state of matter

Multiple Choice

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

• Melting ice

• Burning wood

• Rusting iron

• Baking a cake

Multiple Choice

Which process is an example of a chemical change?

• Boiling water

• Dissolving sugar

• Burning a substance

• Cutting paper

Fill in the Blank

During a chemical reaction, new chemical ___ are formed in the products.

Multiple Select

Which of the following are signs of a chemical change?

• Production of gas (bubbles)

• Unexpected color change

• Cutting into pieces

• Production of a precipitate (solid)

Multiple Choice

According to the Law of Conservation of Mass, what happens to the mass during a chemical change?

• It increases

• It decreases

• It stays the same

• It disappears

Multiple Choice

What does the law of conservation of mass state about the mass of reactants and products in a chemical reaction?

• The mass of reactants is always greater than the mass of products.

• The mass of reactants is always less than the mass of products.

• The mass of reactants is equal to the mass of products.

• The mass of reactants can never be measured.

Open Ended

Explain how the law of conservation of mass applies to chemical changes in matter, using an example from everyday life.

Open Ended

Reflecting on what you learned about chemical changes, how do you think understanding these changes can help us in everyday life or in different careers?

Multiple Choice

What is a chemical change?

• A change that creates something new with new properties

• A change that keeps the substance the same

• A change that only affects the shape

• A change that only affects the temperature