PHYSICS: From Tuesday – here’s our look at a few of the homework problems – #21, the diver, and #22, the circus monkey on the incline, and also a walk through of #41, the second Tarzan problem – the one where he loses Jane.
I LOVE the way you started thinking through these. Don’t give up on them. Treat them like a multi-layer puzzle. 🙂
CHEMISTRY: One man’s rust is another student’s lesson in chemistry! Great job today with oxidation numbers. Now it’s time to go and practice applying them! Try to do your homework without your notes first. Then go back and check and see what you actually knew. Great way to check up on yourself.
God bless you as you study for the Chapter 7 Memorization Quiz tomorrow! You need to have memorized (and be able to use!!): polyatomic ions, monatomic ions (but you can get these off the periodic table), acids, prefixes, and how to write and name chemical formulas. You do not have to know the chemical names and formulas for common substances. Click here for a copy of the PERIODIC TABLE you’ll use on the test – if you want to practice using it on your own.
That’s a lot, but you can do it! And make double dog sure you are working hard at practicing it all now!!
CHEMISTRY: Do you feel like you have letter and numbers swimming in your eyes? This is one of those times that paying attention to details is super, super important! Here’s the lecture from Thursday on writing formulas and names for binary molecular compounds. Part of it’s really similar to what you learned to do for ionic compounds, but another part is totally different. Details!!
Make sure you keep everything straight. Do something that will organize all the information for you, so you won’t get confused. Also, don’t forget the lists you have to memorize – it’s getting larger and larger!! And practice, practice, practice!!!
HON CHEMISTRY: Now that you know how to write chemical formulas, you are going to be amazed at what you can do with them! I love the way you are able to think through what you know and what you need to find a solution. Today you are going to use that to find empirical formulas and molecular formulas all by yourself – well, almost by yourself. 🙂
Be sure and practice – if you don’t it’ll get all turned around and you’ll end up leaving off an important step. The hardest part is that it’s not a set formula for you to plug and play, but if you’ll keep in mind that you’re really just looking for subscripts which are just moles, you’ll be able to think it through. Percent to mass, mass to moles, moles to smallest whole number ratio.
Are you starting to catch on to the steps? It will be good for you to memorize them, but would it not be just tons better to understand why you need each step – backwards and forwards, so then you wouldn’t need to memorize them at all!
And then, also remember what molecular formulas are – just a multiple of the empirical formula. Keep that concept in mind, and you’ll have no problem remembering to divide the molecular formula mass by the empirical formula mass to find X! Easy peasy! 🙂
HON CHEMISTRY: Great job today! Way to apply chemistry to your everyday life!!
I think you’ll find that percent composition problems are super easy to catch on to. First, though, be sure you know which “type” of percent composition you’re trying to fine. Also make sure you can write chemical formulas (I won’t give them to you!) and that you’ve memorized the formulas for acids and those chemical names and formulas for common substances. It’s just plug and play from there! 🙂
CHEMISTRY: How about cranking it up a notch?! First we did binary ionic compounds, and now, let’s tackle formulas with polyatomic ions. Something absolutely necessary – you have got to memorize polyatomic ions – or better yet, learn them! And practice, practice, practice!!