Physical and Chemical Changes

Fill in the blank: A change that produces a new substance is a ______ change.

• A) Physical

• B) Chemical

Fill in the blank: A chemical reaction often results in a change in _______.

• A) size

• B) shape

• C) chemical composition

• D) texture

Fill in the blank: In the chemical equation CH4 + 2O2 → CO2 + 2H2O, the molecules after the arrow are called ________.

• A) products

• B) reactants

• C) atoms

• D) elements

Which of the following is NOT an example of a physical change?

• Whipping eggs

• Boiling water

• Burning wood

• Dissolving sugar

Which of the following processes is a physical change?

• Freezing water

• Burning coal

• Baking bread

• Fermenting grapes

Fill in the blank: A physical change can involve changing the ______ of an object.

• Color

• Smell

• Taste

• Sound

Bread rising is an example of a ________ change.

• Physical

• Chemical

• Biological

• Mechanical

Bread rising is an example of a ________ change.

• Physical

• Chemical

• Biological

• Mechanical

Which of the following is an example of combustion?

• A) Ice melting

• B) Wood burning

• C) Water boiling

• D) Salt dissolving

A candle burning is an example of a ______ change.

• physical

• chemical

• reversible

• temporary