Unit 3 Test Review

Is bleaching your hair a physical or chemical change?

• physical
• chemical

Is burning wood a chemical or physical change?

• chemical
• physical

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What characteristic defines all chemical changes?

• There is a change in state of matter.
• Electricity is produced.
• A new substance is formed.
• Bubbles are produced. 

Tags

NGSS.MS-PS1-2

Which is a physical change?

• burning match 
• vinegar in baking soda 
• melting butter
• cooking an egg

Tags

NGSS.MS-PS1-4

Changing the Shape, State, or Size of an object is a...

• Physical Change
• Chemical Change
• Chemical Property

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Balance this equation-
__P₄ + __O₂ --> __P₂O₃

• it is already balanced
• 2, 1, 3
• 1, 2, 3
• 1, 3, 2

Tags

NGSS.MS-PS1-5

Balance this equation-
_SeCl₆+_O₂>_SeO₂+_Cl₂

• 1,2,1,2
• 1,1,1,3
• 1,2,1,1
• 2,1,1,1

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Is this equation balanced?

• yes
• no
• Not enough information

Tags

NGSS.MS-PS1-5

Decomposition occurs when...

• Two formulas combine.
• A compound breaks apart.
• An atom is replaced during a reaction.
• 2 atoms are replaced during a reaction

A synthesis occurs when...

• Two formulas combine.
• A formula breaks apart.
• An atom is replaced during a reaction.
• two atoms are being replaced during a reaction.