Ms Ps1 5

How many O atoms are in the following formula?
2Na + 2H₂O

• 1

• 2

• 3

• 4

A 500-gram block of solid cheese is melted in a pot. Which is most likely the mass of the cheese after it is melted?

• 500 grams, because the cheese does not gain or lose mass just because it was melted

• 499 grams, because some of the cheese evaporates as it melts

• 502 grams, because the cheese absorbs heat as it melts

Tags

NGSS.MS-PS1-4

NGSS.MS-PS1-5

• 2

• 3

• 5

• 6

Tags

NGSS.MS-PS1-5

The Law of Conservation of Mass says that matter can neither be __________ or __________.

• created; destroyed

• recycled; renewed

• subtracted; added

• joined; separated

Tags

NGSS.MS-PS1-5

According to the Law of Conservation of Mass, what happens to the wood and oxygen when it is burned?

• The wood disappears.

• It stays the same chemically.

• The atoms in the wood and oxygen rearrange and form smoke and ash.

• Nothing.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What do we call the chemicals that result from a chemical reaction?

• reactants

• products

• subscripts

• coefficients

Tags

NGSS.MS-PS1-5

In a reaction A + B ----> C,  reactant A has 5g and product  C has 9g. How many grams does reactant B should have? 

• 4g

• 5g

• 9g

• 14g

Tags

NGSS.MS-PS1-5

Is this equation balanced or unbalanced? 
H₂ + O₂ --> H₂O

• balanced

• unbalanced

Tags

NGSS.MS-PS1-5

12g of Carbon react with 16g of Oxygen, how much carbon monoxide (CO) is formed? 

• 28 g

• 4g

• 30g

• 12g

Tags

NGSS.MS-PS1-5

Is melting butter for popcorn a chemical or physical change?

• chemical

• physical

Tags

NGSS.MS-PS1-4