2/26 Physical vs. Chemical Changes

Which is an example of a chemical reaction?

• paper cut into small pieces
• chocolate melting in a pan
• flour and sugar mixed in a bowl
• cookies baking in an oven

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which would produce a chemical change: select 2

• baking bread

• chopping vegetables

• food digesting in stomach

• choclate melting in your hand

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Why is salt dissolving into water a physical change?

• it is irreversible

• it is reversible

• a gas is released

• a phase change occurs

Sugar dissolved into water is:

• physical change

• chemical change

• both

• neither

What evidence of a chemical change is seen here:

• a light is produced

• a precipitate forms

• a gas is produced

• temperature change occurs

Tags

NGSS.MS-PS1-2

Food rotting is a chemical change because:

• an odor and a light is seen

• odor and color change is seen

• temperature and color change is seen

• a precipitate forms

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Organize these options into the right categories

Groups:

(a) Physical changes

,

(b) Chemical changes

• milk going sour

• new substance is formed

• water freezing

• cutting a piece of paper

• burning a matc

• cooking an egg

• boiling water

• same composition of material

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

NGSS.MS-PS1-4

Match the following

• gas is produced

• 
• precipitate forms

• 
• Temperature change

• 
• color change

• 
• a light is seen

• increase or decrease in temperature

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Why is this a chemical change?

• temperature change occurs

• a color change is seen

• a gas is produced

• a light is seen

Tags

NGSS.MS-PS1-2

Which of the following may be seen in a physical change? Select 3

• change in size of a substance

• a phase change in matter

• change in composition

• change in shape of a substance