Exploring the Law of Conservation of Mass

What does the law of conservation of mass state?

• Mass is neither created nor destroyed.

• Atoms can be created from energy.

• Mass can be created and destroyed.

• Energy can be created but not destroyed.

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NGSS.MS-PS1-5

In an isolated system, what can neither be created nor destroyed?

• Mass and energy

• Atoms

• Energy

• Molecules

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NGSS.MS-PS1-5

What happens to the energy applied to atoms during a chemical reaction?

• It is lost.

• It is stored in the bonds between atoms.

• It is converted to mass.

• It disappears.

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

What is formed when methane combusts with oxygen?

• Methane and water

• Carbon dioxide and water

• Oxygen and hydrogen

• Carbon monoxide and water

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NGSS.MS-PS1-5

How many carbon dioxide molecules are produced from the combustion of propane?

• Four

• One

• Two

• Three

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NGSS.MS-PS1-2

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What does the law of conservation of mass explain about matter?

• Matter can change into energy.

• Matter can be created from nothing.

• Matter can be destroyed into nothing.

• Matter is conserved during a chemical change.

Tags

NGSS.MS-PS1-5

In the experiment with mercury(II) oxide, what is the mass of the liquid mercury produced?

• 0.74 grams

• 12 grams

• 9.26 grams

• 10 grams

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

If 10 grams of mercury(II) oxide decomposes, what is the mass of the oxygen gas produced?

• 9.26 grams

• 1.74 grams

• 0.74 grams

• 10 grams

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NGSS.MS-PS1-2

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What is the total mass of reactants and products in a chemical reaction according to the law of conservation of mass?

• The mass of reactants is greater.

• The mass of products is greater.

• The total mass remains the same.

• The mass of reactants is less.

Tags

NGSS.MS-PS1-5

What is the significance of the yield sign in a chemical equation?

• It indicates the start of the reaction.

• It shows the direction of the reaction.

• It indicates the end of the reaction.

• It separates reactants from products.