What does the Ebola virus actually do in your body? Why is it so dangerous and why does it kill so many people? Take a look at the apocalyptic war that rages in the body after an infection by the Ebola virus and the soldiers fighting....

Learn how to solve for density when you need to calculate the volume of a cube. [2:49]

Don't be confused by significant figures. Let Tyler DeWitt introduce significant figures, and more specifically how to round for multiplication and division using significant digits. [7:10]

This tutorial will go through the algebra and reasoning to figure out the amount of abundances of the isotopes, in percentages and in decimals.

When figuring significant digits, use this tutorial to help figure out how to deal with zeros. [7:36]

A session of scientific notation practice problems in action. [13:31]

Learn how to convert units using conversion factors and canceling units in dimensional analysis. [12:46]

Learn how to use the density number like a conversion factor, to solve for mass or volume. Watch this video after the density introduction or before the more complicated video on density exercises that has unit conversion. [8:55]

Understand how to determine the shape or geometry of a molecule using the VSEPR rules, for valence shell electron pair repulsion.

In this tutorial, find out how to do conversion with numbers that are fractions. [12:30]

In this tutorial, take a look at diagrams of the VSEPR shapes, and examine bond angles for each structure. [15:06]

Learn how to multiply and divide numbers that are written in scientific notation. [5:30]

Scientific notation is a way to express very large and small numbers with exponents as a power of ten. In this tutorial, learn to convert numbers into and out of scientific notation. [13:56]

Join Youtube chemistry tutor, Tyler DeWitt, do practice problems to work on significant figures with zeros. [8:09]

You Tube animation highlights the importance of Natural Killer Cells in the fight against cancer and other diseases. [3:01]

Learn about moles to figure out how many atoms you have in something using the periodic table, molar mass, and Avogadro's number. [10:08]

Take a look at how conversion factors work and what the math means. Understand the unit conversions in a problem to make judgements about the results. [10:14]

Learn how to combine multiple conversion factors into a row so that you can convert units in more than one step using the factor label method or dimensional analysis. [10:04]

This is an introduction to the basics of VSEPR Theory. In this video, learn about the following shapes: linear, trigonal planar, bent, tetrahedral, and trigonal bipyramidal.

This introduction to significant figures discusses basics of multiplication and division. [5:01]

This tutorial explains how to add and subtract numbers written in scientific notation, whether or not they have the same exponent. [7:12]

Watch this tutorial to answer the following questions: What is a weighted average? How do you calculate a weighed average? Weighted averages are used for atomic mass and atomic weight, based on the mass numbers of various isotopes.

In this tutorial, find out how to calculate atomic mass, by multiplying the atomic weight of an atom by the percent abundance expressed as a decimal.

The video tracks formation of snowflakes from their origins in bits of dust in clouds that become droplets of water falling to Earth. As each snowflake rises and falls through warmer and cooler air, it thus develops its own distinctive...