Counting Atoms

Front

What is a chemical formula?

Back

A chemical formula is a way of expressing the number and type of atoms in a molecule using symbols and numbers.

Front

What do subscripts in a chemical formula indicate?

Back

Subscripts indicate the number of atoms of each element in a molecule.

Front

What do coefficients in a chemical equation represent?

Back

Coefficients represent the number of molecules or moles of a substance in a chemical reaction.

Front

How many atoms are in the molecule H2O?

Back

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

Front

What is the total number of atoms in the molecule C6H12O6?

Back

There are 24 atoms in C6H12O6 (6 carbon, 12 hydrogen, and 6 oxygen).

Front

What does the term 'element' mean in chemistry?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means.

Front

How many different elements are in the compound NaCl?

Back

There are 2 different elements in NaCl (sodium and chlorine).

Front

What is the significance of the number in front of a chemical formula?

Back

The number in front of a chemical formula indicates how many molecules of that compound are present.

Front

What is the chemical formula for sulfuric acid?

Back

The chemical formula for sulfuric acid is H2SO4.

Front

How many elements are in the chemical formula H2SO4?

Back

There are 3 elements in H2SO4 (hydrogen, sulfur, and oxygen).