Chemical Reactions & Matter

What happens during a chemical change?

• new matter is produced

• atoms rearrange and produce a new substance

• a substance dissolves when combined with another

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is an example of a physical change?

• an object is cut in half

• water freezes

• sugar dissolves in water

• all of the above

Tags

NGSS.MS-PS1-4

Which of the following is evidence that a chemical change has occurred?

• a change in color

• metal rusts

• a gas is produced

• all of the above

Tags

NGSS.MS-PS1-2

What do we call the substances that are present BEFORE a chemical reaction occurs?

• reactants

• products

• solids

• quotients

Tags

NGSS.MS-PS1-2

What do we call substances that are present AFTER a chemical change occurs?

• reactants

• products

• solids

• quotients

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is one property of the bath bomb gas that we investigated?

• toxicity

• flammability

• boiling point

• melting point

How can we use density when trying to identify an unknown gas?

• measure its density

• if it is more dense, it will rise

• compare its density to the density of air

How do we know that the gas that was produced by the bath bombs was MORE dense than the air in the room?

• the candle's flame went out below the flask

• the flame went out above the flask

• the flame got larger above the flask

Rusting is an example of what kind of change?

• chemical

• physical

• substance

Tags

NGSS.MS-PS1-2

Physical changes produce new substances

• True

• False

• Not enough information to tell