Law of Conservation of Mass & Balancing Chemical Equations

How many nitrogen atoms does NH₃ have?

• 1
• 2
• 3
• 4

Tags

NGSS.MS-PS1-1

How many oxygen atoms are in this chemical formula?

• 6 oxygen atoms

• 2 oxygen atoms

• 3 oxygen atoms

• 4 oxygen atoms

Tags

NGSS.MS-PS1-1

What is the law of conservation of mass?

• The amount of matter changes when reacted or changed.
• The mass of all reactants are changed during a physical or chemical change
• The mass of the reactants equals the mass of the products
• The mass of the products is different than the mass of the reactants.

Tags

NGSS.MS-PS1-5

What does the Law of Conservation of Mass state?

• Mass is created at the end of a chemical reaction

• Mass can not be created or destoryed 

• Mass is created in a physical change 

• New chemicals are formed when a chemical reaction takes place.

Tags

NGSS.MS-PS1-5

Using the picture, what is the coefficient of this chemical compound? 

• 3

• 4

• There isn't one 

Tags

NGSS.MS-PS1-5

Using the picture, what is the subscript of this chemical compound? 

• 4

• 3

• There isn't one

Which of the models of a chemical reaction best represents the Law of Conservation of Mass?

• A

• B

• C

• D

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Which of the models of a chemical reaction best represents the Law of Conservation of Mass?

• A

• B

• C

• D

Tags

NGSS.MS-PS1-5

If reaction starts with 20g of reactants it should produce 

• a total of 40g of products

• a total of 80 g of products

• a total of 10g of products

• a total of 20g of products

Tags

NGSS.MS-PS1-5

The Law of Conservation of matter states that the total amount of matter ______________ after it undergoes change.

• disappears
• stays the same
• weighs less
• explodes

Tags

NGSS.MS-PS1-5