In this interactive module, students are introduced to the most fundamental part of chemistry: chemical reactions and the formulas that accompany them.

A narrated screencast explaining how to use a balanced chemical equation to determine the number of particles of a substance given the starting mass of another substance. [4:46]

Use this narrated tutorial to help understand how to balance a chemical equation using coefficients and leaving formula subscripts unchanged. [9:35]

[Free Registration/Login may be required to access all resource tools.] An overview of chemical equations.

Students apply new knowledge of the elements to name and write chemical formulas, write and balance chemical equations, and perform mathematical calculations about the relationships between those chemicals, using a fundamental unit in...

You should be able to calculate the masses of reactants and products from balanced equations, and the formula of a compound from information about reacting masses.