Law of Conservation of Mass Review

After the reaction, how many grams will Time 2 Setup equal?

• 30 g

• 275 g

• 300 g

• 305 g

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

This chemical equation represents what happens when a nail rusts: 4Fe + 3O₂ –› 2Fe₂O₃. The total mass after the reaction is

• not considered before the reaction.

• 5 times less than before the reaction.

• exactly the same as before the reaction.

• about twice as much as before the reaction.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Anthony is performing an experiment. He adds 0.25 grams of baking soda to 5 grams of water and stirs. Anthony watches as the baking soda dissolves in the water. If Anthony weighs the water and baking soda solution, what will its mass be?

• 4.75 grams

• 5.0 grams

• 5.25 grams

• 7.5 grams

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A student notices that an inflated balloon gets larger when it is warmed by a lamp. Which best describes the mass of the balloon as a result of this change?

• The mass of the balloon increases because the size of the balloon has increased.

• The mass of the balloon increases because the temperature of the balloon has increased.

• The mass of the balloon stays the same because the gas inside the balloon still has the same mass after it warms up.

• The mass of the balloon stays the same because warming decreases the mass enough to cancel out the effect of increasing the size.

Is this equation balanced?

• yes

• no

• Not enough information

Tags

NGSS.MS-PS1-5

Which picture below would correctly demonstrate the Law of Conservation of Matter if this picture is the reactants?

• 
• 
• 
• 

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following models best demonstrates a balanced chemical equation?

• F

• G

• H

• J

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The Law of the Conservation of Mass states that...

• you can create matter

• you can destroy matter

• matter is made up

• matter cannot be created or destroyed

Tags

NGSS.MS-PS1-5

Which of the following best describes the Law of Conservation of Mass?

• Matter can be created and destroyed.

• The mass of reactants equals the mass of products in a closed system.

• Mass is lost during chemical reactions.

• Energy is converted into mass.

Tags

NGSS.MS-PS1-5

In a chemical reaction, if 10 grams of hydrogen react with 80 grams of oxygen to form water, what is the total mass of water produced?

• 70 grams

• 80 grams

• 90 grams

• 100 grams

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5