If one square mile is 640 acres, how many square meters are there in 1 acre?

Learn what the properties of gases are and discover the kinetic molecular theory of gases. Understand the characteristics of ideal gases and know examples of the properties of gases.

What are SI units? Learn what is a derived unit and study the SI base units and SI derived units. Find out what the fundamental SI units, what the base unit for mass is and examples of SI units.

Study dimensional analysis and units of measurement in chemistry. Learn how to apply dimensional analysis and practice using it to solve some example problems.

Learn about significant figures, their rules, and examples. Study scientific notation, its rules, and how scientific notation helps determine significant figures.

Learn what standard notation is, study what scientific notation looks like, and discover examples of converting between standard and scientific notation.

To be valid and reliable, scientific experiments must be based on data that is precise and accurate. Explore techniques for making measurements, review example measurements, and understand how to make calculations with measurements.

Learn about the metric measurements and the metric system units . See how metric system conversion works and compare the measurements to English system.

Learn about metric system prefixes, abbreviations, and mnemonics to remember them. Discover the metric system measurements and see a measurement abbreviation chart.

Learn about changes in matter and see how physical changes of matter compare to chemical changes. Study physical change vs. chemical change examples and processes.

What is Dimensional Analysis? Learn what dimensional analysis means and what it helps us do. Apply the method using examples form different disciplines.

Learn about Niels Bohr's atomic model and compare it to Rutherford's model. Explore how to draw the Bohr model of hydrogen and argon, given their electron shells.

Discover how to calculate sales commission based on the three types of commission structures. Review what sales commission is and understand the percentage of sales method, the stair step structure, and the fixed commission structure.

Learn the physical science definition and study the two main types of physical science. Explore the physics and chemistry branches of physical science with examples.

To interpret charts and graphs of scientific data, you should know the correct orientation of x- and y-axes, understand the trends of the chart, and answer the chart questions on your own. Learn more about the three rules of solving problems that include charts and graphs, and explore relevant practice problems.

Discover radioactive decay and the half-life equation. Learn how to use a half-life graph to write the equation for an atom's half-life and vice-versa.

Learn about physical and chemical properties. Understand what they are, the difference between them, and the physical and chemical properties of matter.