Unit 2 Test Review

What is a chemical change?

• How two chemicals react with one another when combined

• A property that we can measure or observe with our 5 senses or other tools

• When two chemicals react with one another to form a new substance

• When a change occurs but it does not result in the formation of a new substance

what is the definition of physical change?

• any change that results in the formation of new chemical substances. 
• rusting
• changes affecting the form of a chemical substance, but not its chemical identity.

• any property that is measurable, whose value describes a state of a physical system

A change in the size, shape, or state of matter.

• chemical change
• physical change

A change in which NEW substances are formed.

• Chemical change
• Physical change
• Casual change
• Formal change

Identify the change:

Glass breaking

• Physical

• Chemical

Identify the change:

Wood burning

• Physical

• Chemical

Boiling Water

• Physical Change

• Chemical Change

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 options provides evidence of a CHEMICAL change?

• Wood is burned releasing ash and smoke

• Rocks separate when soil is sifted

• Water turns to ice when you put it in the freezer

• Salt dissolves in water

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

• A piece of paper changes shape when you rip it up