8th 2nd Quarter Nine Weeks Review 24

Front

What is a compound?

Back

A compound is a substance formed when two or more elements are chemically bonded together.

Front

Which of the following is not a compound: HCl, Cl, NaCl, CO2?

Back

Cl is not a compound; it is an element.

Front

What is the function of the ozone layer?

Back

The ozone layer blocks ultraviolet radiation from the sun.

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means.

Front

What type of information does Perseverance NOT send back to Earth?

Back

Perseverance does not send back actual rock samples.

Front

In which layer of the atmosphere does weather occur?

Back

Weather occurs in the troposphere.

Front

What is a pure substance?

Back

A pure substance is a material that has a constant composition and consistent properties throughout.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded.

Front

What is the difference between a compound and a mixture?

Back

A compound is a chemical combination of elements, while a mixture is a physical combination of substances.

Front

What is the stratosphere?

Back

The stratosphere is the second layer of Earth's atmosphere, located above the troposphere.