If you are trying to make laughing gas, N2O, and you make N2O5 instead, you now have a highly dangerous chemical. So how do you control what you make when they have the same ingredients? The 14th video in a series of 29 explains how the same elements can make different substances. It also works through how to solve when you know the molecular mass in order to identify which substance you have.

Concepts

moles, balancing chemical equations, avogadro's number

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Additional Tags

science

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Instructional Ideas

• Create an additional guided practice problem comparing ethane (C₂H₆) with propane (C₃H₈)

Classroom Considerations

• Ensure each pupil can easily see and read a periodic table
• Requires prior knowledge from the earlier videos in the series

Pros

• Includes a prompt to pause the video to try solving before seeing the correct solution
• Brief video stays focused on a very limited topic

Cons

• None