Chem/Phys. Changes

Which of the following is an indicator of a chemical reaction

• A precipitate forms

• The substance melts

• The substance evaporates

• All of the above

You drop red food coloring into a glass of water, and the water turns red. Is this a physical or chemical change?

• Chemical, because the water turns red.

• Chemical, because you mix two different substances together.

• Physical because a new substance isn't forming.

• Physical, because the only reason the color looks different is because the food coloring is mixing with the water.

• C and D.

Which of the following is a physical change?

• Burning a leaf

• Boiling water

• Rust forming on a bike chain

• Fireworks exploding

If two substances are mixed and a new substance is formed, what type of change is it?

• Chemical Change

• Physical Change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Reacts with water to form a gas

• Physical property
• Chemical property

Tags

NGSS.MS-PS1-2

Reacts with a base to form water

• Physical property
• Chemical property

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following would be considered a physical change?

• Cutting paper

• pH test

• Burning marshmellow

• Roasting a Turkey

Sodium Hydroxide dissolves in water

• Chemical Change
• Physical Change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

A pellet of sodium is sliced in two

• Chemical change
• Physical Change

Tags

NGSS.MS-PS1-4

Hydrochloric acid reacts with potassium hydroxide to produce a salt, water,and heat.

• Chemical Change
• Physical Change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5