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Saturday, November 16, 2013
11/14 Chemistry Video: The Amazing Atom!
Sunday, November 10, 2013
11/8 Chemistry update and homework due 11/15
Hi folks,
Today we spent a bunch of time working with these recent concepts mathematically. We also undertook a fairly massive and complex lab. The goal was to find the specific heat of lead.
Here are a few websites for the concepts we've been covering the last two weeks. They do a nice job giving examples of the problems and solutions. After taking a look at these, I hope you all feel much more comfortable with these types of problems. As always, DON'T HESITATE, to contact me if you have any questions.
http://www.chemteam.info/Thermochem/Time-Temperature-Graph.html Go through the steps and try to answer the problems. Then feel free to look at the answers.
Last but not least, finish all the questions on the sheet we used in the lab.
Saturday, November 9, 2013
Recording of 11/7 Chemistry Class
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Friday, November 1, 2013
11/1 Chemistry update and homework due 11/8
Hi folks,
Today we started to look at heat capacity, specific heat, and change in temperature. We did a lab where we separately heated 100 ml of water, rubbing alcohol, and vegetable oil, as well as 200 ml of water and measured the temperature every 30 seconds. After the lab, we took a look at all three lab groups results and discussed what we saw. We also introduced the new formula q=mCpΔT which will be haunting us for the next couple of weeks. q = heat, m = mass, C = Specific heat and T= temperature. The funny triangle thing is the greek letter delta and means "change in".
Homework for this week is to do a lab report for today's lab.
For the data analysis portion of the lab report, create one graph with four slopes representing the four materials that were tested in class. So, this graph would have a line for water, rubbing alcohol, vegetable oil and 200 ml water.
Also by using the change in temperature for each liquid and the formula above, determine the amount of heat each substance absorbed in 5 minutes. Remember, you'll need to use the formula for density to find the mass for each material.
For the conclusion, be sure to relate it back to your hypothesis and include the order in which the materials changed in temperature, as well as the order in which they absorbed heat.
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"Science Jim" Mueller
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Saturday, October 26, 2013
Fwd: 11/16 Chemistry update and homework due 11/30
Hi folks,
Sorry this took so long to get this out to everyone.
This week we took a look at the five phases of matter, phase change and the relationship between heat, temperature and phase change.
Homework this week is to answer the following questions and do the enclosed worksheet .pdf.
1. What are the five phases of matter?
2. Describe what happens, molecularly, as a solid increases in temperature and changes phases. Be sure to include a description of the bonds and how they change over the process. Also, what would temperature be doing over time as this substance changed temperature.
3. List the states of matter from least amount of kinetic energy to greatest amount of kinetic energy.
4
Sunday, October 20, 2013
Oct 18 Chemistry Video : Energy and Temperature
Hi folks,
Sorry it took me a bit to get this too you. Had a devil of a time getting it to upload. It kept hanging. Anyway, enjoy!
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