Law Of Conservation of Mass

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

• 5.25 grams

• 5.0 grams

• 7.5 grams

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NGSS.MS-PS1-5

NGSS.MS-PS1-2

Matter can not be created nor destroyed: it can only be

• Destroyed a little bit

• Invisible

• Transformed, changed

• None of the above

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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

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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

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NGSS.MS-PS1-5

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

• A

• B

• C

• D

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NGSS.MS-PS1-5

Which of the following is an open system?

• 
• 
• 
• 

Which of the following is close system?

• 
• 
• 
• 

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

• A

• B

• C

• D

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NGSS.MS-PS1-5

Q. 

True or False

The mass of the reactants in a chemical equation must equal the mass of the products.

• TRUE

• FALSE

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NGSS.MS-PS1-5

A student heated a 10 gram sample of a chemical in an open container. A chemical reaction occurred, and the mass of the sample was measured again. The mass of the sample was found to be less than before the reaction. Which of the following best explains the decrease in mass of the sample?

• The heat caused the chemical to become less dense.

• Some of the lighter particles were destroyed.

• The reaction gave off more heat than was added.

• Some of the particles escaped as a gas formed.

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NGSS.MS-PS1-5

NGSS.MS-PS1-2