Daily Archives: October 22, 2013

Chemistry 10-22-13 Chemical Formula Practice

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CHEMISTRY – Yeah, don’t you wish it was as easy as this rule? The rules for writing chemical formulas, I mean. But no, it seems like there are about 50 million, and you have to keep them all straight! What is the one thing that would help you the most with this? Memorizing polyatomic ions? Memorizing rules for naming? More practice?

Here’s my best advice – first, memorize what you are supposed to memorize – polyatomic ions, rules, etc. Next, organize your notes into what you do for ionic compounds, those with metals and polyatomic ions, and what you do for molecules, those with only nonmetals and metalloids. Next, analyze every single compound you have to name or write a formula for – is it ionic? then you only use the Stock system. Is it a molecule – then you can use the Stock system or prefixes. Do you see what I mean?

Don’t just try to wing it! You’ve got the tools you need, now go use them!!

CHEMISTRY 10-22-13 Chemical Formulas Practice from Tammy Skinner on Vimeo.

flickr photo by Gord McKenna

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Hon Chemistry 10-22-13 Moles to Mass to Molecules

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HON CHEMISTRY: Awesome job today using chemical formulas as tools! So, it turns out there are tons of ways that you can use a chemical formula. Like finding molar mass, moles, and molecules! Did it all sound familiar to you – like we were repeating yesterday’s lecture? Here’s the lecture from today.

P. S. Did you realize how super important it’s going to be for you to be able to correctly write chemical formulas (and memorize all that formula stuff)?!?

HON CHEMISTRY 10-22-13 Molar Mass & Avogadro’s Number with Compounds from Tammy Skinner on Vimeo.

Physics 10-22-13 Forces & Newton’s Law of Inertia

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PHYSICS: So what’s your theory about the cause of motion? And remind me again why didn’t that pen go flying across the room instead of dropping into the bottle? I love Newton’s first law – the law of inertia! Where else do you see it in action in your world?

So, let’s play with this concept tomorrow. Can you use what you know about mass and inertia to find the mass of an unknown object? I know you can! 🙂

PHYSICS 10-22-13 Inertia from Tammy Skinner on Vimeo.