Chemical and Physical Changes

Front

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.

Back

Physical

Front

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

Back

(a) A Physical Change, (b) A Chemical Change

Front

Conclusion from lithium metal reacting with water:

Back

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

Front

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

Back

Chemical

Front

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

Back

Physical

Front

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

Back

Precipitate

Front

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.

Back

Physical

Front

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

Back

False

Front

Based ONLY on the observations of a car swerving, crashing into a tree, the tree falling, the car being crunched, and liquids pouring out, what happened? Options: Physical Changes, Chemical Changes, Both Chemical and Physical Changes.

Back

Physical Changes

Front

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

Back

Mixing two clear liquids and forming a blue liquid