Counting Atoms

Front

What is an atom?

Back

An atom is the smallest unit of matter that retains the properties of an element.

Front

What is a molecule?

Back

A molecule is a group of two or more atoms bonded together.

Front

What does a chemical formula represent?

Back

A chemical formula represents the types and numbers of atoms in a molecule.

Front

How do you determine the number of atoms in a chemical formula?

Back

Count the subscripts in the formula; if there is no subscript, it is assumed to be 1.

Front

What is the subscript in a chemical formula?

Back

A subscript is a number written below and to the right of an element symbol, indicating the number of atoms of that element.

Front

What is the significance of parentheses in chemical formulas?

Back

Parentheses indicate that the atoms inside are grouped together and may be multiplied by a subscript outside the parentheses.

Front

How many hydrogen atoms are in C6H12O6?

Back

There are 12 hydrogen atoms in C6H12O6.

Front

How many oxygen atoms are in 2Ca(OH)2?

Back

There are 4 oxygen atoms in 2Ca(OH)2.

Front

What is the chemical formula for ammonia?

Back

The chemical formula for ammonia is NH3.

Front

How many magnesium atoms are in 10MgCl2?

Back

There are 10 magnesium atoms in 10MgCl2.