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## Q1: week 7 – 10/16 – 10/20

” The first day of class should connect to the last day and every day in between!”

Please check Power School for accuracy!
Everyone needs to join Remind for class.  Click me to sign up.

LAB 1 – Density of Solids IS LATE
LAB 2 – Density of Coke IS LATE!
LAB 3 – Separation of Margarine IS LATE!!

Main focus –

1. To identify kinetic and potential energy changes on a heating or cooling curve.

2. To identify  points on a heating a cooling curve that represent when a solid first begins to       melt, etc.
3.  To determine whether a phase change is endothermic or exothermic
4. To define a solid, liquid, and a gas.

Period  6: –

1. Whiteboard phase changes activity –

a) Draw a compound in three phases.

2.  Burn cotton with watersuperheat steam Demo (water in the GAS Phase)!

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!

1.  Complete the following form based on a heating curves. You have a total of three submissions to this form tonight.

1: Heating Curve Form 3:

Main focus:

1. To identify the flow into or out of a system.
2. To identify the factors used to measure a change of Energy.
3. To determine the amount of heat absorbed in a system
using thermal equation: q = mC∆T                . .

Period  6: –

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

Period  7: –

1. Lab 5 – Determine the heat lost by metal blocks

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

10/17 –  Tuesday  “B” Day Homework:

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

Heating and Cooling Curve Review worksheet Key.pdf

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!

Main focus:

1. To complete the CAT 3 – Energy 1
Period  6: –

1. To Complete the conclusion for Lab 4.
2. Take the CAT 3 – 1st submission

1. Restudy topics from today’s CAT that you did not know. Use the resources from Tuesdays posted list.

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Connect

Main focus:

1. To complete CAT 3
2. To measure energy change in water from hot blocks using the thermal equation.
3. To determine what specific heat represents.
4.  To calculate the specific heat from the thermal equation

Period  6:

12nd Submission of the CAT 3.

2. Define energy and provide examples of nutritional labels from other countries.
3. Lab 5 – calorimetry of Metal blocks

Period  9:

1. Lab 5 – calorimetry of Metal blocks continues

Energy Presentation:   Nutritional labels from other countries. calories vs joules

10/19 –  Thursday – “B” Day homework:

1.   For those that still need a second try on the Heating Curve CAT please re-study.  Everyone else there is no homework!

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Connect

Main focus:
1. To complete the calculations of the metal block lab
2. To measure and evaluate the specific heat of water, Al & Cu experimentally
3. To determine the heat flow in an calorimetry experiment

Period 7:

1. Complete the data section of the Metal Block Lab:

2. Complete the diagram of the apparatus and illustrate the heat flow

3.  Define Specific heat!