Conservation of Mass Review

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-PS1-2

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 have?

• 4g

• 5g

• 9g

• 14g

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

If reaction starts with 20g of reactants it should produce 

• a total of 40g of products
• a total of 10g of products
• a total of 80 g of products
• a total of 20g of products

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

• 28 g
• 4g
• 30g
• 12g

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

When a log is burned, what happens to the wood?

• The mass stays the same, but becomes smoke and ash.

• It disappears.

• The mass changes as it goes away.

• Nothing. You're imagining things.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS1-5

Why does this picture demonstrate the Law of Conservation of Mass?

• the number of atoms of each element are the same on both sides

• they start out separate and end up combined

• the same elements are used

• it doesn't demonstrate the Law of Conservation of Mass

Tags

NGSS.MS-PS1-5

Measure of the amount of matter 

• mass
• volume
• weight
• density

Anything that has mass & takes up space

• gravity
• force
• matter
• volume

Tags

NGSS.MS-PS1-4

NGSS.MS-PS1-5

Smallest unit of an element

• compound
• atom
• molecule
• product

Smallest unit of a compound

• atom
• density
• element
• molecule