What is the Law of Conservation of matter?

• Matter is created in a chemical reaction

• Matter is created in a physical change

• New chemicals formed from a chemical reaction have a larger overall matter than the original reactants

• Matter is never created or destroyed

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NGSS.MS-PS1-5

An oreo cookie weighs 20 grams.  It gets crushed into crumbs for a recipe.  How much do its crumbs weigh?

• 15 grams
• 25 grams
• 20 grams

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NGSS.HS-PS1-7

If the mass of a chemical reaction's product is 15 grams, what would the mass of the reactants be?

• 20 g

• 15 g

• 10 g

• 3 g

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NGSS.MS-PS1-5

Why does this picture demonstrate the Law of Conservation of Matter?

• the number of atoms of each element are the same on both sides

• they start out separate and end up combined

• the same elements are used

• it doesn't demonstrate the Law of Conservation of Matter

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

If a chemical reaction occurs in a closed system (no way for any part of the reaction to escape), how does the product mass compare to the reactant mass?

• the mass would decrease

• the mass would increase

• the mass would stay the same

• it depends on the type of reaction

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

If a chemical reaction occurs in an open system (not contained), what might happen to the measurable mass of the products when compared to the reactants?

• the measurable mass might decrease because any gas produced can escape (the actual mass would stay the same)

• the mass would increase because mass was created

• the measurable mass would stay the same because nothing would be able to leave the system.

• it depends on the type of reaction

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

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

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NGSS.MS-PS1-2

NGSS.MS-PS1-5