Matter Review

Which of these activities would require use of water in its solid form?

• steaming vegetables

• cooking noodles

• making a snowball

• taking a shower

A fork contains magnetic material. However, when Kristen holds a magnet to the fork, the fork is not attracted to the magnet. What is the MOST likely explanation for this observation?

• The magnetic field of a simple magnet is too weak to attract the fork.

• There is another metal inside the fork that is not magnetic.

• Over time, the fork has lost its magnetism.

• There is plastic inside the fork.

Ayleen needs to sort the recycling before she takes it out. She has some plastic bottles, and some steel cans. Which of the following is a good way for Ayleen to separate the bottles and the cans?

• fill the bottles and cans with water and put them in the freezer

• look at the bottles and cans under a magnifying lens

• sort them by color

• use a magnet to pick up the steel cans

Magnets generate an invisible region in which magnetic forces act. What is the name for this region around the magnet that can attract materials?

• pole

• field

• cell

• bar

The picture shows magnet 2 being pushed toward magnet 1. What will happen to magnet 1 when magnet 2 is moved closer?

• Nothing will happen to magnet 1

• Magnet 1 will move under magnet 2

• Magnet 1 will move over magnet 2

• Magnet 1 will move away from magnet 2

Chemical changes occur when molecules of one substance are rearranged to form a different substance. Which of the following is a chemical change?

• bending

• burning

• freezing

• shredding

Chellie is picking tomatoes from her garden. She finds a tomato on the ground that is soft and runny. Which sentence best describes what happened to the tomato?

• The tomato decayed, which is a chemical change

• The tomato moved, which is a chemical change

• The tomato deflated like a flat tire, which is a physical change

• The tomato ignited like a firecracker, which is a chemical change

Liz pushes the mower around the yard, cutting the grass. When she stops the mower, she removes the grass catcher and pours the clippings into the compost pile. The grass will eventually become humus that can be mixed into the garden. Finally Liz sweeps the grass clippings off the sidewalk. Which statement is true?

• Cutting the grass is a chemical change

• Composing the grass is a physical change

• Sweeping the sidewalk is a physical change

• Pushing the lawnmower is a chemical change

A block of wood, a block of aluminum, a block of stone, and a block of clay all have the same volume. Which of these has the greatest density?

• aluminum

• clay

• stone

• wood

Emily is describing the physical properties of an orange and a lemon. Which physical property can she determine without using any measurement instruments?

• color

• volume

• height

• density