Wednesday, September 25, 2013

Class Blog 9/25/13


Before Class:
1. Homework assignment “Calculating Molar Mass” was checked in.
2. “Moles 1” (2 Sheets), “Mole Conversions”, “Mole Worksheet #1” were all picked up at the start of class (These can be found on Moodle).
3. Mole Calcs Worksheet (there are two sheets in the one file) are homework due tomorrow (Unit 2 Handouts on Moodle).
4. “Moles 1” can be used as extra practice.

Answers to “Calculating Molar Mass” (which was Homework)
Equation
Parenthesis represent subscripts
Fe(2)= 2 Irons
Molecular or Ionic
Name of Compound
Molar Mass in g/mol
(Go to 2 decimal places)
CaCO(3)
Ionic
Calcium Carbonate
100.09
N(2)O(6)
Molecular
Dinitrogen Hexoxide
124.02
Na(2)SO(4)
Ionic
Sodium Sulfate
142.05
C(8)H(18)
Molecular
Octane
(OK if you didn’t know)
114.30
Fe(3)(PO(4))(2)
Ionic
Iron(I) Phosphate
357.50

****Remember the differences between ionic and covalent bonds while completing this****

Note: Grades for Beverage Lab, Non-metal vs Metal Lab, and Chapter 1 Quiz will be entered in the next few days. Class Dojo grades for Chapter 1 and 2 homework will be entered after Chapter 2.

Class:
1. Remember, a mole contains 6.022×1023 items!
2. This grams to moles to molecules conversion factor was used to solve problems on notes sheet “Moles 1” which can be found here with all the work shown. As you can see, the grams to moles to molecules was applied to solve a variety of problems.
3 . More practice with moles and using molar mass as conversion factor (see “Moles 1”).
Notes for “Moles 1” were filled out, can be found on Moodle again here, the rest is extra practice, NOT extra credit!

Next Blogger: Brant

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