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An example of a characteristic property is

• size.

• chemical activity.

• amount.

• shape.

Unlike physical changes, chemical changes always

• involve melting or boiling.

• form a new substance or substances.

• change the physical state of a substance.

• take a relatively long time.

Tags

NGSS.MS-PS1-5

A substance contains two different components joined by physical means. Which best describes the substance?

• element

• compound

• mixture

• water

Which type of matter can be separated by physical means?

• atom

• element

• compound

• mixture

Which is a homogeneous mixture?

• pizza

• vinegar

• concrete

• woven fabric

Which represents a compound?

• air

• iron

• soil

• water

Tags

NGSS.MS-PS1-1

Which could best be separated into simpler substances by filtration and evaporation?

• atom

• element

• compound

• solution

Can a phase change produce new compounds?

• No, because physical changes occur.

• No, because chemical changes occur.

• Yes, because atoms can bond together to form new substances.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Which is the best example of a heterogeneous mixture?

• sugar

• brass

• salad

• salt water

Which substance is composed of only one type of atom?

• element

• mixture

• solution

• molecule