Counting Atoms Practice

Front

What is a compound?

Back

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

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 does the chemical formula NaCl represent?

Back

NaCl represents sodium chloride, which is commonly known as table salt and is a compound.

Front

How many hydrogen atoms are in the chemical formula C6H12O6?

Back

There are 12 hydrogen atoms in glucose (C6H12O6).

Front

What is the total number of atoms in the compound 2H2O?

Back

There are 6 total atoms in 2H2O (2 hydrogen atoms per water molecule, and there are 2 water molecules).

Front

How many different elements are present in propane (C3H8)?

Back

There are 2 different elements in propane: carbon (C) and hydrogen (H).

Front

What is the total number of atoms in ammonia (NH3)?

Back

There are 4 total atoms in ammonia (1 nitrogen atom and 3 hydrogen atoms).

Front

What does the subscript in a chemical formula indicate?

Back

The subscript indicates the number of atoms of the element in the molecule.

Front

What is the difference between a compound and a mixture?

Back

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

Front

What is the chemical formula for water?

Back

The chemical formula for water is H2O.