HMH Unit 3 Lesson 1 - Chemical Reactions

Which of the following is NOT an example of a physical change?

• Wood burning

• Ice melting

• Water boiling

• Paper tearing

Which of the following is NOT an example of a chemical change?

• Wood burning

• Chopping vegetables

• Fruit rotting

• Digesting food

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A objects floats in water. This is an example of a _________.

• physical property

• chemical property

Ice melts at 32^o Fahrenheit. This is an example of a __________________.

• physical property

• chemical property

Tags

NGSS.MS-PS1-4

Paper burns when exposed to a flame. This is an example of a ___________________.

• physical property

• chemical property

Tags

NGSS.MS-PS1-2

A science class did an experiment in which two substances were mixed. After 15 minutes, everything looked the same, but the students noticed an odor coming from the experiment. What does this likely indicate?

• A liquid was formed.

• A temperature change occurred.

• A chemical reaction occurred.

• A physical change occurred.

Tags

NGSS.MS-PS1-2

Which of the following is the best evidence that a chemical change has taken place in this picture?

• The apple is smaller in size after cutting.

• The apple has turned brown.

• The apple has changed shape.

• The apple is in two parts.

Tags

NGSS.MS-PS1-2

Two metal bars are each placed in a beaker containing the same solution. What evidence indicates that a chemical reaction is taking place in one of the beakers? Select ALL that apply.

• A gas is being given off.

• There is a change in color.

• The solution is clear and colorless.

• Bubbles are forming.

Tags

NGSS.MS-PS1-2

Both beakers contain the same liquid. Based on what you observe in the beakers, which of the following statements is true?

• Chemical reactions can always be seen.

• The two samples of metal are different substances.

• Chemical reactions are unpredictable.

• New substances are formed in each beaker.

Tags

NGSS.MS-PS1-2

How does analyzing the inputs and outputs of a system help you to determine what occurred in the system?

• Following how matter is transformed can show how the system functions.

• Following how matter is destroyed can show the drawbacks of the system.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5