Conservation of matter

An oreo cookie has a mass of 20 grams. It gets crushed into crumbs for a recipe. What is the mass of the crumbs?

• 15 grams

• 25 grams

• 20 grams

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

Matter is anything that ---

• takes up space and has mass.

• is in our universe.

• is light, sound or ideas.

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

• disappears

• stays the same

• weighs less

• explodes

When ice melts, the water has the same _________ as the

• temperature

• state of matter

• shape

• mass

15 grams of sugar are dissolved into 300 grams of water. what is the mass of the mixture?

• 15

• 315

• 285

• 300

250 grams of iron and sand are separated. The mass of the sand is 150 grams. What is the mass of the iron?

• is it impossible to determine.

• 100 grams

• 150 grams

• 250 grams

Sarah and Jake were each given a ball of clay that has a mass of 400 grams. Both students used all their clay to make an object. Sarah rolled hers into a ball, and Jake made a long, skinny rope. What is the mass of the clay figures now?

• Sarah's weighs more because it is round

• Jake's weighs more because it is long

• There is no way of knowing

• They figures would have equal masses.

Which of the following is NOT part of the Law of Conservation of Matter?

• Matter cannot be created or destroyed

• Matter can be rearranged

• Fire converts matter to heat

• Matter can change phase; go from a solid to a liquid to a gas

Why does the weight of the dry ice go down while it's sitting on the scale?

• it's melting
• it's disappearing
• turning into a gas
• none of these