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It is worth memorizing Avogadro's number, 6.022 x 1023

It is also worth memorizing a selection of chemistry jokes. In my experience, non-chemists will occasionally ask if you know any. My best ones are below:

How many moles in a guacamole?
Avocardo's number.

Why do chemistry professors like to teach about ammonia? Because it's basic material.

Argon walks into a bar. The bartender says "Get out! We don't serve your noble gases here." Argon doesn't react. 

Which dissolves better in water, a brown bear or a white bear? A white bear, because he's polar.

Also learn the conversion factor from Celsius to kelvin, +273.15. There will be Americans at university, so impress them by knowing how to convert to Celsius from Fahrenheit. You do it roughly by subtracting 32 and dividing by 2.

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