Unit 2 Quiz 1 - Signs of a Chemical Change

A(n) ______ is a molecule made up of 2 or more different elements.

• atom

• mixture

• compound

• element

Tags

NGSS.MS-PS1-1

The smallest unit of an element that still has the same properties of that element is called a ____.

• proton

• atom

• molecule

• compound

What happens in EVERY chemical change?

• A gas is produced.

• A temperature change occurs.

• At least 3 substances combine

• A new substance is formed.

Tags

NGSS.MS-PS1-5

Marcus folded a piece of paper to make an airplane. He commented " I caused a chemical change!" Which statement BEST describes Marcus' claim?

• Marcus was correct because only a chemical change can create something new.

• Marcus is right because folded paper can never go back to its original shape.

• Marcus' claim is incorrect because folding paper doesn't cause the molecules to rearrange.

• Marcus is incorrect because a gas is always produced during a chemical change.

Which of the following signs was not observed when the magnesium burned?

• A precipitate formed

• Light was given off

• Heat was released

• An odor was produced

Tags

NGSS.MS-PS1-2

In the steel wool lab, what were the two reactants. (Select two)

• steel wool

• lighter

• oxygen

• thermal energy

Tags

NGSS.MS-PS1-2

Fizzing and bubbles are NOT signs of a chemical change, but they are evidence that which sign has occurred?

• heat was released

• light was given off

• a gas was produced

• a precipitate formed

Tags

NGSS.MS-PS1-2

Agnus said washing clothes is a chemical change. Which sentence BEST describes Agnus'

claim?

• Agnus is correct because bubbles are created which means a gas was produced.

• Agnus is incorrect because air mix with the soap to form bubbles, but no new substance was created.

Tags

NGSS.MS-PS1-2

Answer the following question using the Claim, Evidence, & Reasoning model that we practiced this week.

Is burning steel wool a physical change or a chemical change & give evidence to support your claim.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5