Chemical and Physical Changes 8.P.1.3

What happens to water molecules during the boiling process?

• they move faster and move farther apart

• they move faster and remain close together

• they move more slowly but move farther apart

• they move slower and move farther apart

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which demonstrates a chemical change?

• glass breaking

• a garbage can rusting

• sugar dissolving in water

• water evaporating from a sidewalk

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Two clear solutions are mixed together in a beaker. Which result would indicate a chemical reaction had occurred between these solutions?

• increase in volume

• decrease in volume

• increase in temperature

• increase in evaporation

Tags

NGSS.MS-PS1-2

Which is an example of a physical change?

• ice melting

• wire rusting

• cake baking

• plastic burning

During photosynthesis, carbon dioxide and water combine to make sugar and oxygen. Why is photosynthesis a chemical reaction?

• because new substances are formed

• because an input of energy is required

• because the reactants are compounds

• because the products include an element

Tags

NGSS.MS-LS2-3

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What do bubbles MOST LIKELY indicate in a chemical reaction?

• phase change

• gas formation

• temperature change

• precipitate formation

Tags

NGSS.MS-PS1-2

Which statement BEST describes the formation of rust?

• rust results from a physical mixing of iron with water

• rust results from a chemical breakdown of old metal

• rust results from a chemical reaction between iron and water

• rust forms from a physical change when wind blows against metal

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which occurs when a precipitate forms during a chemical reaction?

• color change

• production of a gas

• temperature change

• production of a solid

A potter molded wet clay into a bowl and let it dry. The potter knows that the clay went through a physical change when it became a bowl because the bowl

• is a different color than the wet clay

• is the same substance as the wet clay

• has a different texture than the wet clay

• holds the same amount of water as the wet clay

Which shows one example of a physical change and one example of a chemical change?

• boiling alcohol and melting cheese

• rusting nails and baking bread

• dissolving sugar and shredding lettuce

• freezing milk and burning wood

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4