Exploring Physical and Chemical Changes

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

• Burning wood

• Rusting iron

• Melting ice

• Baking a cake

If you mix salt and water, what method can you use to separate them?

• Filtration

• Evaporation

• Magnetism

• Decanting

Which observation would best support the claim that a chemical change has occurred?

• The substance changes shape

• The substance changes color

• The substance melts

• The substance evaporates

Plan an investigation to determine if a chemical change has occurred when vinegar is mixed with baking soda. What evidence would you look for?

• Change in color

• Formation of gas bubbles

• Change in shape

• Change in size

What happens to the particles of water when it is heated from a solid to a liquid?

• They move slower

• They move faster

• They stop moving

• They move in a circular motion

Which of the following best explains why ice melts when heated?

• The particles shrink

• The particles expand

• The particles move faster

• The particles stop moving

Construct an argument to support the claim that boiling water is a physical change.

• It produces a new substance

• It changes the state of water

• It changes the color of water

• It changes the temperature of water

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

• Change in temperature

• Formation of a new substance

• Change in state

• Production of gas

What is the main difference between a physical change and a chemical change?

• Physical changes are reversible, chemical changes are not

• Chemical changes involve a change in state, physical changes do not

• Physical changes produce new substances, chemical changes do not

• Chemical changes are reversible, physical changes are not

Plan an investigation to show that dissolving sugar in water is a physical change.

• Observe the change in color

• Measure the temperature change

• Evaporate the water to retrieve the sugar

• Observe the formation of gas