Physical and Chemical 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

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

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?

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

Front

This is a _____________ change.

Back

Chemical