Physical and Chemical Changes

A physical change (a)  

• changes the physical properties of
• creates a new substance and cannot

A student mixes yellow powder with water. Which observation would prove a CHEMICAL change occurred?

• The powder DISSOLVED in the water

• The water turned the COLOR yellow

• The bag's TEMPERATURE changed

• The STATE OF MATTER changed

Which of the following examples provides evidence of a PHYSICAL change?

• Wood is burned and releases ash and smoke

• Iron rusts over time

• When mixed, baking soda and vinegar form gas bubbles

• Boiling water bubbles when heated

Which of the following options provides evidence of a CHEMICAL change?

• Wood is burned releasing ash and smoke

• Rocks separate when soil is sifted

• Boiling water bubbles when heated

• Salt dissolves in water

Water is boiling on a stove, producing steam. What conclusion can you make about the change that is occurring?

• Boiling water bubbles indicate a chemical change

• Steam indicates a state of matter change

• Heat indicates a chemical change

• The clear color indicates a chemical change

Which observations prove a chemical change occurred

• Dissolving and expected color change

• Mixing and dissolving

• State of matter change and boiling water bubbles

• Unexpected color change and temperature change

When mixing milk and vinegar, a white, chunky, solid substance is formed. What has occurred?

• Physical change: state of matter

• Chemical change: precipitate

• Physical change: freezing

• Chemical change: rust

Burning wood is a

• chemical change

• physical change

Broken glass is a

• chemical change

• physical change

Melting butter for popcorn is a

• chemical change

• physical change