Chemical & Physical Changes

A student heats a beaker of water with a hot plate and over time, the water begins to bubble, the volume decreases and vapor is visible. This is an example of a ____________ change.

• Chemical

• Nuclear

• Physical

• Musical

Cutting a tree limb into logs is (a)____________ and burning them in the fireplace is (b)____________.

• (a) A Physical Change

  (b) Also a Physical Change

• (a) A Physical Change

  (b) A Chemical Change

• (a) A Chemical Change

  (b) Also a Chemical Change

• (a) A Chemical Change

  (b) A Physical Change

When lithium metal is dropped into a container of water, the lithium sparks and fizzes and the water begins to bubble violently. The conclusion that can be drawn from that is:

• A new substance is created because this is a chemical change.

• No new substances are created because there is a chemical change.

• No new substances are created because this is a physical change.

• A new substance is created because this is a physical change.

In this example, there is no gas produced, no temperature change, no odor, and no solids formed. This must be a _________ change.

• Physical

• Emotional

• Hypothetical

• Chemical

A white crystalline powder is mixed with water. No temperature change is observed but the solid disappears. This must be a __________ change.

• Chemical

• Mechanical

• Physical

• Electrical

When two liquids are mixed and a solid is formed, the new solid is called a ________________.

• Levitate

• Precipitate

• Palpitate

• Bad date

Percy is cutting the grass and picks up the clippings. He hates lawn work but loves the smell of cut grass. Percy has created a _________ change.

• Physical

• Chemical

True or false: A chemical reaction requires at least one liquid at the start.

• True

• False

A car swerves to avoid a collision with an oncoming vehicle and crashes into a tree. The tree falls over. The car is crunched. Liquids pour out of the car onto the street. Based ONLY on those observations, what happened here?

• Physical Changes

• Chemical Changes

• Both Chemical and Physical Changes

Which of the following is a chemical change?

• Mixing two clear liquids and forming a blue liquid

• Mixing a clear liquid and white solid and getting a clear liquid

• Mixing a clear liquid and a dark purple solid and getting a light purple liquid

• Mixing a clear liquid with a white solid and getting a cloudy white liquid