## Writing Formulas

Kayla Farris 1E
Posts: 5
Joined: Wed Sep 21, 2016 2:59 pm

### Writing Formulas

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?

Eljie_2F
Posts: 19
Joined: Fri Jun 17, 2016 11:28 am

### Re: Writing Formulas

Yes. :)))

Jessica_Nakahira_1G
Posts: 16
Joined: Wed Sep 21, 2016 2:57 pm

### Re: Writing Formulas

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.

Matthew Huang 1C
Posts: 9
Joined: Wed Sep 21, 2016 2:57 pm

### Re: Writing Formulas

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...

Rachel Wile 2D
Posts: 49
Joined: Sat Jul 09, 2016 3:00 am

### Re: Writing Formulas

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-

Kaitlin_Ryan_ 3K
Posts: 28
Joined: Fri Jul 15, 2016 3:00 am

### Re: Writing Formulas

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.

404757006
Posts: 20
Joined: Wed Sep 21, 2016 3:00 pm

### Re: Writing Formulas

That is a really good way to memorize that!! thank you so much it helps a lot!!