Shortened class due to an assembly.  We had a practice quiz on mole calculations.  It is on the Unit 3 page of this site. 

We made cookies today.  There will be a practice quiz tomorrow and a real quiz on Friday for mole calculations.  Look at the homework from yesterday for review questions.

We found how many moles of chalk were used to write our names.  Quiz on Wed. on mole concept.  Meet in the cooking room tomorrow.
Homework:  p.192 #2-5; p.193-195 #13ac, 14acd, 16ab, 17ab, 21, 31

We completed the basic mole calculations today.  Look in your text on p.186-192 for examples.  If you were not present in class today, please download the "mole cookie 11" document from the unit 3 page of this site.  The ones given out yesterday to a few students were incorrect.
Extra help at lunch Monday in room 208.
Homework:  p.186 #27; p.187 #31-32;  p.190-191 #35, 37, 39; complete the "Pre-lab Classwork" section of the mole cookie handout to hand in on Monday - if not handed in, you can't make cookies on Tuesday
Quiz next Wednesday on mole calculations.

The mass of one mole of any element or compound has the same numerical value as the average atomic mass, but the units are grams rather than atomic mass units.  We can use this molar mass, with units of g/mol, to find mass of a number of moles of something.  Consult your text, p.180, 181 for help.  We also went through how to find moles from number of particles of a substance.  Look on p.176-178 for examples.
Homework:  p.177 #16-18, p.178 #19, 20, 22; p.184 #25

No class.

We completed an activity to show that objects can be counted by mass.  In chemistry, there is a unit of measure called the mole.  It represents 6.02x1023 of anything, in the same way that a dozen represents 12 of anything. Consult p.171-176 for help.
Homework:  p.177 #13, 14

When using measurements to calculate answers to problems, the number of significant digits in the measured values affects the answer you record.  Consult your text, p.20-22 for help with this. 
Homework:  B&C from 1st side of yesterday's handout; 2nd side of handout; text p.22#3, p.24 #4, p.647 #4, 5