Identifying Physical and Chemical Changes

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

• Burning wood

• Melting ice

• Rusting iron

• Baking a cake

Tags

OK.SCI.7.PS1.2

What is a sign that a chemical reaction has occurred?

• Change in shape

• Change in color

• Change in size

• Change in state

Tags

OK.SCI.7.PS1.2

Which process does NOT result in a new substance being formed?

• Dissolving sugar in water

• Burning paper

• Cooking an egg

• Rusting a nail

Tags

OK.SCI.7.PS1.2

Which of the following is a chemical property?

• Density

• Boiling point

• Flammability

• Melting point

Tags

OK.SCI.7.PS1.2

What is always true about the substances before and after a physical change?

• Their chemical composition changes

• Their physical state changes

• Their chemical composition stays the same

• They form new substances

Tags

OK.SCI.7.PS1.2

Which observation best indicates a chemical reaction has taken place?

• Water freezing

• Iron turning reddish-brown

• Ice melting

• Salt dissolving in water

Tags

OK.SCI.7.PS1.2

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

• Formation of a gas

• Change in color

• Change in shape

• Formation of a precipitate

Tags

OK.SCI.7.PS1.2

Which of the following best describes a chemical change?

• Water boiling

• Paper being cut

• Silver tarnishing

• Ice melting

Tags

OK.SCI.7.PS1.2

A student mixes vinegar and baking soda and observes bubbling. What does this indicate?

• A physical change has occurred

• A chemical reaction has occurred

• The substances have evaporated

• The temperature has decreased

Tags

OK.SCI.7.PS1.2

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

• Water evaporating

• Ice melting

• Wood burning

• Sugar dissolving

Tags

OK.SCI.7.PS1.2