Conservation of Mass

How many oxygen atoms are in the products for the chemical reaction below?
 $4Fe\ +\ 3O_{2\ }\rightarrow\ 2Fe_2O_3$  

• 2

• 3

• 5

• 6

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-1

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

• reactants

• products

• subscripts

• coefficients

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

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

How many atoms are in the products below?
 $4Fe\ +3O_{2\ }\rightarrow\ 2Fe_2O_3$  

• 7

• 10

• 17

• 20

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-1

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-PS1-5

NGSS.MS-PS1-2

Substances present at the start of a chemical reaction

• subscripts
• coefficients
• reactants
• products

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

A 55-gram egg is placed in a pot. After the egg is boiled, which is most likely the mass of the egg?

• 50 
• 55 

Tags

NGSS.MS-PS1-4

What does the principle of conservation of mass mean?

• The total mass of the reactants is more than the products
• Matter is not created or destroyed
• The total mass of the reactants is less than the products

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

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