Review and Unit 2 Quiz

Review and Unit 2 Quiz

Scribe: Grace Kilpatrick

Date: September 23, 2013

We began class today by going over the answers to the following handouts.

• Names and Formulas of Ionic Compounds
• Classification of Elements
• Naming Practice

These can all be found in the Unit 2 Handouts folder on the Moodle Page. Below are some of the problems we reviewed in class that may have been difficult!

Names and Formulas of Ionic Compounds

3d) Name the following compounds that contain polyatomic ions. 

Cu3PO4

Remember the rule for naming compounds with polyatomic ions is as follows:

Name the first metal present. Then, name the polyatomic ion. Names for polyatomic ions can be found at the top of our periodic table handout. 

So, our the first element present is copper (Cu). PO4 is a polyatmic ion known as phosphate. Thus the name of the given compound would be copper phosphate. 

TIP: Anytime you see 3 elements together, one of which is metal, in a compound, it is likely there is a polytamic ion present.

6l) Write the formulas for the following compounds.

Magnesium Hydroxide

We should first recognize that Magnesium is the element Mg, an alkali earth metal with a charge of +2.

Hydroxide is a polyatomic ion. It is written as OH and has a charage of -1.

Remember, when writing compounds, the charges of the ions present must ¨cancel out¨ or balance the equation.

Since Mg has +2 charge, it requires two -1 charge OH ions to bond to in order to balance the charges. So the answer is, Mg(OH)2. Remember to use parentheses when indicating more than one of a polyatomic ion.       

7f) Name each of the following compounds.

MnO2

We should first recognize that the compound contains a transition metal (Maganese) and a non-metal (Oxygen). So, we should use our rule for naming compounds that contain a transition metal:

When naming a compound that includes a transition metal, include a roman numeral to tell the charge of the first transition metal. This is because transition metals are capable of forming multiple ions.

Oxygen has a charge of -2. This means 2 atoms with a -2 charge would have an overall charge of -4.

In order to balance the equation, the element maganese (Mn) would have to have an overall charge of +4.

Since there is only one atom of maganese present, as indicated in the original compound we know that this maganese has a charge of +4 or maganese (IV). 

We can finish off our name of the compound by ending the non-metal (oxygen) with -ide, to become oxide.

Our answer is : maganese (IV) oxide

The concept of writing formula names with transition metals is a tricky one! Here is a video tutorial that can help:

Classification of Elements

Thise was one of the other two handouts that we reviewed briefly before the quiz. An amazing video can be found on the previous blog post that reviews everything you need to know on the periodic table. 

Naming Practice

This was another handout we reviewed. For the handout the most important idea to understand is:

When a nonmetal combines with a nonmetal, use greek prefixes to indicate the number of atoms each element in the compound except in the case where the first element has only one atom. End the compound name in -ide.

Quiz

We took a quiz today that goes over everything we have learned since our last unit. We worked on the quiz with a partner but these quizzes will be graded individually. See Mrs. Friedmann if you missed the quiz, as you will need to make it up in the Test Center.

Homework

1) Read sections 3.1 and 3.2 in your text and complete the reading sheet (posted in the Unit 2 Handouts folder).  Note that this is a WebAssign sheet, but I want you to answer the questions on the sheet and show them to me tomorrow in class rather than actually doing the WebAssign online.  WebAssign has given us enough headaches lately!

The next scribe will be: Mary Langas

Naming Covalent Compounds/Acids and the Periodic Table

Naming Covalent Compounds/Acids and the Periodic Table

Scribe: Grace Kilpatrick

Date: September 20, 2013

The main purpose for today´s lesson was to learn how to name covalent compounds and acids, as well as studying the organization of the Periodic Table.

Here is what we did in class today!

Notes

We first took notes on Naming Covalent Compounds. These notes can found in the Unit 2 Notes folder. Some important ideas include:

• Prefixes indicate the number of atoms present for each molecule. These prefixes are..  mono- one, di- two, tri- 3, tetra- 4, penta- 5, hexa- 6, hepta- 7, octa- 8, nona- 9, deka-10. 
• Covalent bonds are bonds are between two non metals and are also known as molecular bonds.
• The rule for naming covalent compounds is to say the name of the first element and its prefix, then the 2nd element with its prefex. End in ¨ide¨. Never use mono to say there is one of the first element at the beginning of the formula.

We then also took notes on Naming Acids. These notes can be found in the Unit 2 Notes folder. Some important ideas include:

• An acid compound must start with ¨H¨. 
• If an acid does contain oxygen and an anions that ends with ¨ate¨, the ending of the acid is changed to -ic. (Remember if you ate something gross, you would say it is ¨icky¨!) If an anion ends with -ite, the ending of the acid is changed to -ous.

We also took notes on the periodic table. These can be found in the Unit 2 Notes folder as well. Some important notes include:

• The major groups of the periodic table are alkali metals, alkaline earth metals, transition metals, halogens, noble gases, and lanthanides/actinides. 
• The group and element falls under allows us to draw conclusions about the ions it forms, as well as its reactivity. 

Need further explanation on the periodic table? This is a great review video!

HANDOUTS

Today in class, we picked up the following three worksheets:

• Names and Formulas of Ionic Compounds
• Classification of Elements
• Naming Practice Covalents 

These can be found in the Unit 2 Handouts folder and should be completed for homework. 

HOMEWORK

1) There will be a quiz on Monday on all the material we have learned this week (everything since our last unit test, including this weekend´s homework).

2) Three worksheets: ¨Names and Formulas of Ionic Compounds¨, ¨Classification of Elements¨ and ¨Naming Practice Covalents¨ (in the Unit 2 Handouts folder).

3) Three ChemThink tutorials and question sets: ¨Ionic Bonding¨, ¨Ionic Formulas¨, and ¨Covalent Bonding¨. Take notes on the tutorials to show me on Monday; one page in your journal should be enough space for all three sets of notes! The ChemThinks are due by 11:59 on Sunday night. 

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!