Molarity Tutorial and Practice Problems

Thanks again to the people at "Sophia"

http://www.sophia.org/tutorials/molarity

http://www.sophia.org/tutorials/molarity-calculations

Mole Conversion Practice Problems

The following link from the "Sophia" websites provide a somewhat rough, but effective tutorial on solving mole conversion problems.  There is an online quiz also to the right of the videos that allow you to check your understanding.  Try them please.

http://www.sophia.org/tutorials/mole-as-a-quantity

http://www.sophia.org/tutorials/molar-mass-of-an-element

http://www.sophia.org/tutorials/molar-mass-of-a-compound

http://www.sophia.org/tutorials/converting-from-grams-to-moles

http://www.sophia.org/tutorials/converting-from-moles-to-grams--2

http://www.sophia.org/tutorials/converting-from-particles-to-moles

http://www.sophia.org/tutorials/converting-from-moles-to-particles

Mole and Molarity - How do we represent "concentration?"

We will continue to look at concentration next week and begin to be more specific with how chemists view the ratio of "stuff to water."  To get ready for the lessons, please review the following videos that describe the mole and molarity.

What is a mole?

Formula Weight, atomic weight, molecular weight

How else do we represent the Mole in Chemistry?

Calculating the concentration in Molarity PART 1

Calculating the concentration in Molarity PART 2

Serial Dilution Reference Material

Awesome interactive animation that demonstrates serial dilution

"Homework" For Next Class

You should have a digital representation (word document, powerpoint/prezi, etc.) that communicates the following associated with your experiment determining the "best" glassware to measure with:

• Goal - state the goal of the experiment.
• Materials/Equipment list - what did you use to perform this experiment (i.e graduated cylinder, pipette, etc.).  Pictures would be helpful, but not necessary.  You should be specific (i.e. instead of graduated cylinder, you would write 100 mL Graduated Cylinder).
• Procedure - Step-by-step list of instructions that explains the steps necessary to collect the data for this experiment.
• Data - Organize your data in a table or tables.  The key here is organize.
• Calculations/Results - You need to perform the following calculations with each data set (i.e. for each piece of glassware) 
• Average Volume of Water Measured
• Percent Error (using the value from the glassware as the accepted value; the value from the scale, in mL, is the experimental value)
• Mean Absolute Deviation (MAD)

You must be able to show me ONE example of each calculation in your write-up, but you still need to calculate the above for each data set.  You will list the ANSWERS TO ALL CALCULATIONS in a RESULTS table.  Results are answers that are calculated.  So you should have a table that provides the Avg Volume, %Error, & MAD for each piece of glassware.

*note - I have created a new page at the top of the blog titled "screenshots" to highlight things that happened during class.  You can find the notes from the board here.

This is what you need for Monday.  Come see me for any clarification.  

Reflection for Group Work on the Geo-exchange Activity

Please download/print and fill out the document from the link below:

You will be reflecting on the Geo-exchanger Design Project.

http://www.dailyteachingtools.com/images/500SelfEval.jpg

I will be experimenting with other forms that are similar to this document, let's give this one a try.

It is due first thing, next class.

Email me with any questions.

Marx

HOMEWORK DUE 9/5/2014

Please go up to the Antioxidant Project page, click on it.
Then read the articles titled:
Men's Health article on the basics/myths of Antioxidants
Penn State news article describing function of antioxidants 
Also watch the video titled:
Video that describes basics of Antioxidants role in protecting cells

Be prepared to discuss the articles and ask questions to clear up any confusing information.  I realize you know little about what is being communicated through these documents....that is where the teaching/learning comes in.

See you tomorrow....