Law of Conservation of Mass and matter

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

• disappears

• stays the same

• weighs less

• explodes

Matter is anything that

• takes up space and has mass.

• is in our universe.

• is light, sound or ideas.

Matter can under go two types of changes:

• happy and sad

• physical and chemical

• exploding and folding

What tool might a scientist use to demonstrate the Law of Conservation of Matter?

• ruler

• beaker

• thermometer

• balance scale

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

All the pieces that make up Lego Yoda and R2D2 weighed 20 grams.  How much do Lego R2D2 and Yoda weigh when they are put together?

• 20 grams

• 35 grams

• 15 grams

_{Mrs. Roth's tea cup and hot tea weigh 100 grams.  She stirs in 10 grams of sugar. How much is the total amount of matter in Mrs. Roth's tea cup and tea now?}

• 100 grams

• 110 grams

• 90 grams

How much does a 5 gram Hershey's kiss weigh after it is melted in the microwave?

• 5 grams

• 3 grams

• 7 grams

What is the Law of Conservation of mass?

• Mass is created in a chemical reaction

• Mass is created in a physical change

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

• Mass is never created or destroyed

In a reaction A + B ----> C,  reactant A has 5g and product  C has 9g. How many grams does reactant B should have? 

• 4g

• 5g

• 9g

• 14g