Polyatomic Ionic Compounds

Polyatomic Ionic Compounds

Scribe: Grace Kilpatrick

Date: September 19, 2013

Hi everyone! I´d first like to apologize for the delay on this post. Here is what we did today.

NOTES:

First, we noted the location of the common polyatomic ions at the top of the sheet that contains our periodic table. This will be very useful to you. 

Polyatomic: groups of atoms can have a charge too!

Examples:

NH4⁺¹ - ammonium ion        

                                                                                           

This entire molecule has a +1 charge.
Ammonium is the ONLY positive polyatomic ion!

SO4²⁻ - sulfate ion

This entire molecule has a 2- charge.

(Note: You may use -2 interchangeably.)

OH⁻¹ - hydroxide ion


This entire molecule has a -1 charge.





**Treat each "clump" like ONE thing!**

Charges need to balance out with these too!

ex. potassium and nitrate ion

K⁺¹  and  NO3⁻¹

becomes KNO3

Na⁺¹       SO4⁻²       --> Na2So4

Mg⁺²      NO3⁻¹       --> Mg(NO3)2

Al⁺³        OH⁻¹        --> Al (OH)3

NH4⁺¹    PO4⁻³       --> (NH4)3PO4

One should notice that when indicating there is more than one of a polyatomic ionic compound, the compound should be put in parentheses followed by the quantity present in order to balance the equation, as seen in the examples above.

These notes can also be found in the Unit 2 Notes folder on Moodle!

HANDOUTS:

We then went on to complete the worksheet titled: 

Polyatomic Ionic Compounds: Name to Formula Using Crisscrossing

This can be found in the Unit 2 Handout Folder!

HOMEWORK:

1) Complete the Forming Ionic Compounds worksheet that was handed out on 9/18.

2) Complete the Naming Ionic Compounds worksheet (Parts A and B) that was handed out today.  We have not discussed this topic in detail in class; refer to Chapter 2 in your text for help and do your best; we will continue practicing naming and forming ionic compounds tomorrow in class.  Don't do the Naming and Forming Ionic Compounds sheet that was handed out today, we'll do it in class tomorrow.

3) 4 WebAssigns due tonight at 11:59 pm

4) No one has any ideas about the puzzle???  What does the image in the Unit 2 box stand for?!  I will not tell you until someone figures it out!!! :)

EXTRA HELP?

Still don't understand the topic? Not a problem! Here's an extra video tutorial that can help!

This is a tutorial on writing formulas with polyatomic ions using the crisscross method!