Chemical Formulas and Compounds

Front

What is a chemical formula?

Back

A chemical formula is a way of expressing information about the proportions of atoms that constitute a particular chemical compound or molecule.

Front

What does the subscript in a chemical formula indicate?

Back

The subscript in a chemical formula indicates the number of atoms of the element present in the compound. For example, in H2O, the '2' indicates there are two hydrogen atoms.

Front

What is the formula for barium iodide?

Back

BaI2

Front

What is the formula for the compound that forms between strontium (Sr) and bromine (Br)?

Back

SrBr2

Front

What is the correct formula for iron (II) sulfide?

Back

FeS

Front

When sodium (Na) and nitrogen (N) combine, what is the formula?

Back

Na3N

Front

Which of the following is incorrect: sodium oxide = NaO, potassium sulfide = K2S, copper (I) oxide = Cu2O, sodium fluoride = NaF?

Back

sodium oxide = NaO is incorrect; the correct formula is Na2O.

Front

What is the significance of oxidation states in chemical formulas?

Back

Oxidation states indicate the degree of oxidation of an atom in a compound, helping to determine the correct formula for compounds.

Front

How do you determine the formula for a compound formed from a metal and a non-metal?

Back

The formula is determined by balancing the charges of the ions formed by the metal and non-metal. For example, Na+ and Cl- combine to form NaCl.

Front

What is the formula for potassium sulfide?

Back

K2S