Physical and Chemical Changes

Lighting a match and baking a cake are two actions that involve chemical changes. Why are these actions considered chemical changes?

• A.

  they change the state of matter

• .

  B.

  They create new substances.

• C.

  They change volume.

• D.

  They create energy.

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Louis was investigating physical and chemical changes in matter. Which of these changes that Louis found involves a chemical change in matter?

• A.

  evaporation of water

• B.

  grinding of rock

• C.

  melting of ice

• D.

  rusting of iron

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Emily made a chart that included physical changes and chemical changes. Which change should be categorized as a chemical change?

• A.

  iron becomes rusty

• B.

  a gold bar is melted

• C.

  lake water evaporates

• D.

  a granite rock is polished

Tags

NGSS.MS-PS1-2

Which event is an example of a chemical change?

A.

fog rising off a river

B.

wood burning in a fireplace

C.

ice cream melting in the sunshine

D.

grinding peppercorn into pepper flakes

• A.

  fog rising off a river

• B.

  wood burning in a fireplace

• C.

  ice cream melting in the sunshine

• D.

  grinding peppercorn into pepper flake

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which statement BEST describes the formation of rust?

 

• A.

  Rust results from a physical mixing of iron with water.

• B.

  Rust forms from a chemical breakdown of old metal.

• C.

  Rust results from a chemical reaction between iron and water.

• D.

  Rust forms from a physical change when wind blows against metal.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which is an example of a chemical reaction?

• A.

  Vinegar added to baking soda forms a gas.

• B.

  Water evaporates into air.

• C.

  Sugar dissolves in water.

• D.

  Corn kernels are crushed to form flour.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A chemical change happens when

 

• A.

  glass breaks into pieces.

• B.

  dough bakes in an oven.

• C.

  ice cream melts into a liquid.

• D.

  electricity flows through a wire.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

When a person chews, saliva from the mouth mixes with starches in food. These starches begin to turn into sugars. Changing starches into sugars is BEST described as

• A.

  a phase change.

• B.

  a cellular change

• C.

  a physical change

• D.

  a chemical change.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

9. 9. Which part of digestion is mainly a chemical change?

• A.

  Teeth break food into small pieces.

• B.

  Throat muscles push food toward the stomach.

• C.

  Stomach acids dissolve food into nutrien

• D.

  Intestinal cells transport nutrients into the blood.

Tags

NGSS.MS-PS1-2

1. 10. A type of cold pack has two separate sections inside. One section contains a liquid and the other section contains a powder. When the cold pack is squeezed, the section that holds the liquid breaks. When the liquid combines with the powder, the pack becomes very cold.

Which is the BEST explanation why the temperature of

• A.

  A mixture forms.

• B.

  A solution forms.

• C.

  A chemical change occurs.

• D.

  Thermal energy is used.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-3

NGSS.MS-PS3-5