This material explains the different unifying themes in the study of biology.

This material explains solution stoichiometry and how to solve problems related to solutions including concentration, dilution, neutralization and more.

This material describe with detailed examples the different properties of living things. It also explains our current understanding of the origin of life.

This material explains, in a step by step manner, how to determine the molecular and empirical formula of substances

This material shows ho to solve stoichiometric problems step by step. All examples and practice problems are solved with a simple, easy to follow method.

This material contains a detailed, step-by-step procedure for determining the percent composition of compounds. It has many worked out problems that students can refer to.

This material explains empirical and molecular formulas of compounds. It also outlines a simple approach on how to determine the empirical and molecular formulas of compounds.

This is a practice problem on stoichiometry. I wrote an easy to follow method for solving stoichiometric problems that any student can follow.