Q1: week 7 – 10/16 – 10/20
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___________________________________ Jump to: Monday Homework 10/16 – Monday – A Day
1. To identify kinetic and potential energy changes on a heating or cooling curve.
Period 6: –
3. Complete Lab 4 questions/conclusion
Today’s Demo – Superheating Steam (Water in gas phase).
I burned cotton with water because the gas LOST energy exothermically to the cotton as it condensed back into liquid water. I had to heat the water endothermically to first get the water in the gas phase (boiling). I was able to superheat the water gas (water vapor) because gas has no limit to how hot it can get. There is no other phase for it to change into. I was adding more kinetic energy to the gas THUS I WAS ADDING MORE POTENTIAL ENERGY to the gas!! As the water gas moved faster (as it gained heat from the torch) its potential energy increased! Its potential was so High it had the potential to burn cotton!
H2O (l) + Heat —> H2O(g) Boiling (energy is needed to be absorbed) = endothermic
H2O (g) —> H2O(l) + Heat Condensation (energy released) = exothermic
The heat released exothermically from a gas condensing into a liquid is what burned the cotton balls!
_______________________________________________________ Jump to: Tuesday Homework / top 10/17 – Tuesday “B” Day – Lab –
Main focus:
1. Review the homework form –
2. View animations and identify kinetic and potential energy
3. Measuring Energy Lesson – used the lab to teach this concept
Lab 5 – heat absorbed by water by a metal block
1. Lab 5 – Determine the heat lost by metal blocks
Lab 5 – Calorimetry of Metal Blocks.pdf View Download
Ice melting animation:
Notice that the water molecules are initially in the solid phase, which is a 3 dimensional geometric pattern (crystal formation). They are initially vibrating in their fixed positions very slowly (low temperature) and as they absorb kinetic energy (heat) their vibration increases. The vibrations increase up until the molecules start pulling away from each other(melting). Why would the temperature stay constant at this point.
Water Boiling animation:
Today’s Lesson: Based on this presentation
Today’s Lesson: Lecture 1.13 – Measuring energy
1. Please make one more submission to Monday’s Nights form if you did not get a 100. Please pay close attention to the last question that I went over in class today. I made new key for that question.
Please Study for a CAT tomorrow on the Heating and Cooling Curve.
2. Use the worksheet below as review. Do ONLY page 1 and 2 of the REVIEW Worksheet.
Heating and Cooling Curve Review worksheet.pdf
View Download
3. You can review the forms that we have done since DOG 1 by redoing the forms as they are still open and are on auto- reply. If you get a 100 on your practice I will replace that graded in power school.
a) Phases Form – week 6 – Tuesday 10/10. https://forms.gle/76yf7mGsMaNJ7dYc8
b) Heating Curve Form 1 – week 6 – Wednesday 10/11 https://forms.gle/KivnUdJxGc6zDaLz7
c) Heating and Cooling Curve Form 2– week 6 – Thursday 10/12 https://forms.gle/wf99347SWA1Mba6t5
d) Heating and Cooling Curve Form 3 – week 7 – Monday 10/16 – posted above under Monday silly!
_____________________________________________________ Jump to: Wednesday Homework/top 10/18 – Wednesday – A Day
Main focus:
_____________________________________________________________ Jump to: Thursday Homework/top 10/19 – Thursday “B” Day – Lab
Energy Presentation: Nutritional labels from other countries. calories vs joules
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_________________________________________ Jump to: Friday Homework 10/20 – Friday “A” Day