Elements & Compounds

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. Examples include hydrogen (H), oxygen (O), and carbon (C).

Front

What is a compound?

Back

A compound is a substance formed when two or more elements chemically bond together. Examples include water (H2O) and carbon dioxide (CO2).

Front

What is the difference between an element and a compound?

Back

An element is a single type of atom, while a compound consists of two or more different types of atoms bonded together.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded. Examples include air and salad.

Front

What happens to salt when salt water boils?

Back

When salt water boils, the water (H2O) evaporates, leaving the salt (NaCl) behind.

Front

What is the chemical formula for water?

Back

The chemical formula for water is H2O.

Front

What is the chemical formula for carbon dioxide?

Back

The chemical formula for carbon dioxide is CO2.

Front

What is the process of evaporation?

Back

Evaporation is the process by which liquid water turns into vapor and enters the atmosphere.

Front

What is the average speed formula?

Back

Average speed = Total distance / Total time.

Front

If Keke travels at 70 mph for 4 hours, how far does he travel?

Back

280 miles.