Matter HW 5/14

Which of the following best explains what will happen if you fill a container to the top with liquid and then tightly secure the lid and place it in a freezer?

• As it freezes, the liquid will maintain its shape and volume as it slowly turns into a solid
• As it freezes, the liquid will take up more space and push out on the container until it bursts.
• As it freezes, part of the liquid will become gas, which will push out on the container until it bursts
• As it freezes, the liquid will take up less space because it will be a mixture of solid, liquid, and gas

1)  A compost pile is made up of vegetable scraps, grass clippings, and other yard waste. With the help of bacteria that break down matter, the plant material slowly becomes smaller particles that help the soil.  
What would slow down this process of breaking down the plant material in a compost pile?

• lowering the surrounding temperature
• compacting the material into a smaller space
• turning the pile over to introduce more oxygen
• introducing worms or other creatures to the pile

Think about how water would change if an ice cube tray with ice was left on the counter over night and then placed back in the freezer the next day. In what order would the phases of water be from the ice pulled out of the freezer the first time to pulling it out after it was frozen the second time?

• liquid, solid, gas

• solid, liquid, gas

• solid, liquid, solid

• liquid, solid, liquid

Melting, boiling, condensation, evaporation, and freezing are all examples of a physical change because

• they all create a new substance.

• they all cause liquids to change to a gas.

• they all cause solids to change to a liquid

• they do not create a new substance.

baking, burning, rust forming, bubbles forming to produce a gas, and cooking are all examples of chemical changes because

• they all create a new substance.

• they all cause liquids to change to a gas.

• they all cause solids to change to a liquid

• they do not create a new substance.

What are the characteristics of solid matter?

• takes the shape of any container

• molecules are packed closely together

• objects have a definite shape

• have a definite shape and molecules are packed closely together

Which describes liquid matter?

• has a definite volume but no definite shape, takes the shape of every container

• has a definite volume

• it is wet

• molecules are packed tightly together

The two objects shown are the same size. However, one object is made of wood, and the other object is made of plastic. Which of the following properties of the objects will be the same?

• mass

• texture

• volume

• weight

Dan brought some chocolate chips in a plastic container with his lunch one day. He decided to save them and eat them while he waited for the bus after school. All afternoon his lunch bag sat on the warm windowsill in his classroom. When he finally took the container out after school, the chocolate chips had turned into a hard chunk of chocolate shaped like the bottom of the container. What happened to his chocolate chips?

• They started as a solid, melted, and then became solid again

• They changed from a solid to a gas before becoming solid once again.

• They were a cool solid to start, then became a warm solid before cooling again.

• They went from being a hard solid to a gas, a liquid, and then to a hard solid again.

Mason found a piece of a broken glass bottle. He picked it up and made these observations about it:

1. No color (clear)

2. Makes scratches on wood

3. Has a bumpy surface

4. Broke when I dropped it

He thinks the glass is a solid and most of his observations could only apply to a solid. Which one of his observations could possibly apply to a solid, a liquid or a gas?

• 1

• 2

• 3

• 4