Changes in matter

What is most likely to happen to a piece of bread when it is exposed to air for a period of time?

• It undergoes a chemical change because it hardens.

• It undergoes a physical change because it melts.

• It undergoes a chemical change because it slowly starts to crumble.

• It undergoes a chemical change because a new substance begins to grow on it.

Tags

NGSS.MS-PS1-2

How do you know when a piece of fruit is starting to decay?

• It starts to change color.

• It starts to bubble.

• It starts to harden.

• It starts to expand.

A chemical change results in a

• loss of matter or energy.

• solution.

• change of state.

• different kind of matter.

Tags

NGSS.MS-PS1-2

Mary left a block of wood, a glass jar, and a cardboard box filled with metal hinges outside her house. It then rained for three days. When Mary checked on her things, she found the block of wood was softer, the glass jar was full of water, and the box was softer and full of rusty hinges. Which of these objects showed evidence of chemical change?

• the block of wood

• the glass jar

• the hinges

• the card board box

Tags

NGSS.MS-PS1-2

A scout snaps a twig in half and then burns the pieces in a campfire. How would you describe this change?

• a physical change

• a chemical change followed by a physical change

• a chemical change

• a physical change followed by a chemical change

Tags

NGSS.MS-PS1-2

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

• a candle burning

• a window breaking

• food decaying

• a car fender rusting

Tags

NGSS.MS-PS1-2