Changes in matter

Mario places 10 mL of water in a test tube and heats the liquid over a Bunsen burner for 2 minutes. After removing the test tube from the Bunsen burner, there are 6 mL of water left in the test tube. This experiment is a good example of a

• chemical change involving phase changes

• physical change involving chemical reactions

• physical change involving phase changes.

• . chemical change involving chemical reactions.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

When substances go through chemical changes, which of the following will always happen?

• A gas will form or a white solid will precipitate.

• One or more substances will be completely destroyed.

• Exactly one new substance will form and one will be destroyed.

• One or more substances with different chemical properties will form.

Tags

NGSS.MS-PS1-2

Which statement describes a physical change?

• Iron combines with oxygen to form rust.

• Sodium metal reacts explosively with oxygen.

• Calcium is added to acid and hydrogen gas is produced

• Lead is heated and becomes more viscous.

5 . Jenny got a balloon at a party. When she squeezes the balloon, she can squish the air inside it and change the shape of the balloon. Which of the following is/are true about the change that happens when Jenny squishes the balloon?

I. It is a physical change.

II. It makes a new substance.

III. It is a chemical change.

• II only

• I and II only

• II and III only

• I only

Tags

NGSS.MS-PS1-2

Hannah does an experiment. She has two colorless chemicals that she mixes together in a beaker. Which of the following indicates that a chemical change occurs when she mixes the two chemicals together?

I. The chemicals change color from colorless to purple.

II. A yellow gas forms.

III. A brown solid forms in the bottom of the beaker.

IV. The temperature of the chemicals rises 15

• I, II III and IV

• I and III only

• II and III only

• I, II, an III only

Tags

NGSS.MS-PS1-2

Michael mixes two chemicals together in a beaker. The chemicals change color, and the beaker heats up quickly. What kind of change most likely occurred?

• no change occured

• only a physical change occured

• a mixture formed

• a chemical change occured

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is a sign that a chemical reaction has occurred?

• change in shape
• melting
• formation of a gas
• dissolving

Tags

NGSS.MS-PS1-2

A solid piece of chocolate is melted and changed to liquid form. Which property of the piece of chocolate will remain the same?

• Texture
• Temperature
  
• Shape
•  Mass

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-4

A change where one or more new substances are created.

• Physical Change 
• Chemical Change 

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Fizzing, foaming, and burning are all examples of

• Chemical change
• Physical change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5