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.

Front

How many elements are in the chemical formula HHe?

Back

There are 2 elements in HHe: Hydrogen (H) and Helium (He).

Front

What is the chemical symbol for Calcium?

Back

The chemical symbol for Calcium is Ca.

Front

Is salt (NaCl) a compound or an element?

Back

Salt (NaCl) is a compound.

Front

What is the chemical symbol for Sulfur?

Back

The chemical symbol for Sulfur is S.

Front

What is a compound?

Back

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

Front

Give an example of a compound.

Back

Water (H2O) is an example of a compound, made from hydrogen and oxygen.

Front

What is the difference between a mixture and a compound?

Back

A mixture is a combination of two or more substances that are not chemically bonded, while a compound is a substance formed from a chemical reaction between elements.

Front

What is the chemical formula for table salt?

Back

The chemical formula for table salt is NaCl.

Front

What does the symbol 'O' represent in chemistry?

Back

The symbol 'O' represents the element Oxygen.