Elements & Compounds

Front

What is a compound?

Back

A compound is a substance formed when two or more elements chemically bond together in a fixed ratio.

Front

Which of the following is a compound? NaCl, O2, Cl

Back

NaCl is a compound.

Front

How many total atoms are in the compound H2O?

Back

There are 3 total atoms in H2O (2 hydrogen and 1 oxygen).

Front

What element has the symbol Na?

Back

The element with the symbol Na is sodium.

Front

What does the arrow in a chemical reaction represent?

Back

The arrow in a chemical reaction means 'yields' or indicates the direction of the reaction.

Front

What is the symbol for the element sulfur?

Back

The symbol for sulfur is S.

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 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 chemically bonded together.

Front

What is the chemical formula for water?

Back

The chemical formula for water is H2O.

Front

What is a molecule?

Back

A molecule is a group of two or more atoms bonded together, which can be of the same or different elements.