Chemical Formula Review

Front

What is a chemical formula?

Back

A chemical formula is a way of expressing the composition of a substance using symbols for its constituent elements and numbers to indicate the ratio of 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. For example, in H2O, the '2' indicates there are two hydrogen atoms.

Front

What is the total atom count in the formula 2H2O?

Back

6 (2 Hydrogen + 1 Oxygen = 3 atoms per molecule, and there are 2 molecules: 3 x 2 = 6).

Front

True or False: A molecule can consist of two or more different elements.

Back

True.

Front

What elements are present in the compound C6H12O6?

Back

Carbon, Hydrogen, Oxygen.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of only one type of atom, while a compound is made of two or more different types of atoms chemically bonded together.

Front

What does the formula NaCl represent?

Back

Sodium Chloride, which is table salt, consisting of sodium and chlorine.

Front

How many oxygen atoms are in the formula 3CO2?

Back

6 (3 molecules of CO2, each containing 2 oxygen atoms: 3 x 2 = 6).

Front

True or False: The formula for water is H2O.

Back

True.

Front

What is the significance of the coefficients in a chemical formula?

Back

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