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Writing Formulas

Posted: Sun Oct 09, 2016 4:41 pm
by Kayla Farris 1E
Will we be expected to know how to write formulas such as nitric acid, lithium sulfide, etc. for the quiz or will they be given to us?

Re: Writing Formulas

Posted: Mon Oct 10, 2016 12:05 am
by Eljie_2F
Yes. :)))

Re: Writing Formulas

Posted: Sun Oct 16, 2016 9:49 pm
by Jessica_Nakahira_1G
My understanding is that in the future I think we will have to know the formulas for different compounds but the purpose of the first quiz, and maybe even the next, is definitely just to test our knowledge of concepts and if we are capable of applying equations to the appropriate problems.

Re: Writing Formulas

Posted: Mon Oct 17, 2016 9:39 pm
by Matthew Huang 1C
Does anyone have any memory tricks or mnemonic devices to memorize some of the more common molecules such as nitrate and nitrite, or is it all just memorization through repetition and practice? I remember learning these in high school, but for me as well as for many others, it's been a few years since I've had to use this knowledge and I've gotten very rusty...

Re: Writing Formulas

Posted: Fri Oct 21, 2016 5:57 am
by Rachel Wile 2D
To remember polyatomic ions, I have always used this mnemonic:
Nick the Camel ate a Clam Supper in Pheonix with Ale.
Nick = N for Nitrogen, the word has 3 consonants so there are 3 oxygens, and 1 vowel so a charge of -1. Therefore, Nitrate = NO3-1
Camel = C for Carbon, 3 consonants and 2 vowels, so Carbonate = CO3-2
Clam = Cl for Chlorine, 3 consonants and 1 vowel, so Chlorate = CO3-
Supper = S for Sulfur, 4 consonants and 2 vowels, so Sulfate = SO4-2
Pheonix = P for Phosphorus, 4 consonants and 3 vowels, so Phosphate = PO4-3
Ale = Al from Aluminum, 2 consonants and 1 vowel, so Aluminate = AlO2-1

Once you memorize the -ates, it will be easy to remember the -ites since they simply have 1 less oxygen than the -ate form. For example chlorite = ClO2-

Re: Writing Formulas

Posted: Fri Oct 21, 2016 11:33 am
by Kaitlin_Ryan_ 3K
For future quizzes I believe we will be expected to know how to name the compounds. If you need a review, there is a section in the course reader under "Review of High School Chem" that goes over some basic naming rules.

Re: Writing Formulas

Posted: Thu Dec 01, 2016 11:12 pm
by 404757006
That is a really good way to memorize that!! thank you so much it helps a lot!!