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## Q1: week 7- 10/10 – 10/14

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

Please check Power School for accuracy!

I WILL NOT ACCEPT HOMEWORK AFTER 5:00 am the following day.  IF THERE IS A Problem YOU NEED TO EMAIL ME. IF YOU DO NOT and you do not complete your homework on time YOU WILL EARN A ZERO!

Everyone needs to join Remind for class.  Click me to sign up.

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10/10 – Monday – Columbus Day – “Indigenous peoples Day”

Columbus discovered America?  But he only made landfall in the Bahamas and Cuba?  Wait didn’t the Vikings make the voyage?  Wait the Chinese mapped out the America’s 70 years before the voyage?  Wait, didn’t native American Indian’s “discover” the America’s first?  Wait wasn’t the America’s already here?

10/11 – Tuesday “B” Day – Lab  –

Main focus:

1. To observe the phase changes in a Cooling and Heating Curve of water.
2. to identify the Phase changes and the melting and boiling point from a heating curve.
2. To identify the identity of an unknown substance by its melting/Freezing point.

Period 8:

1.  We will view the time lapse video of the heating curve of water.
2.  We will take notes on this this graph.

Heating and Cooling Curve Review worksheet.pdf

Heating and Cooling Curve Review worksheet.pdf

Period 9:

1.  We gather data for the Cooling Curve Lab 4.

LAB 4 -Cooling curve of an unknown substance .pdf

– MELTED OUR SAMPLES
– Cooled them and graphed the temperature  every 30 seconds for 60 minutes.
– Identified the experimental freezing point graphically and from data points staying the most constant
– Identified our sample based on the freezing point.
– Calculated the percent error.

Time lapse of the Heating Curve of water below its melting point

used this to teach with page one of today’s worksheet.

Today’s Lesson:

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10/11 –  Tuesday  “B” Day Homework:

1.  Please complete the worksheet (NOT THE LAB) that was handed out in class today FROM 1 – 11 only on both sides!!
Heating and Cooling Curve Review worksheet.pdf

2.  Review with the key posted below:

Heating and Cooling Curve Review worksheet Key.pdf

10/12 – Wednesday – A Day!

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.

1.  We will review the homework, questions 1 – 11 on both sides.

Heating and Cooling Curve Review worksheet Key.pdf

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

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!

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10/12 –  Wednesday – “A” Day homework: –

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

– If you are having trouble please view my lesson lecture 1.15 posted above Tuesday’s homework to review the concepts.

– Also take a look at the demo video and the notes above it that will help with the form.
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Connect

1: Heating Curve Form:

End Of Tuesday!

10/13 – Thursday “B” Day – Lab

Main focus:

1. To Identify the direction of the flow of heat from exothermic to endothermic.
2. To identify the properties of a solid, liquid and a gas.
3. To complete the  Cooling Curve Lab.

Period  8:

1. Review the homework form.

2. View the ice melting/ boiling animation to identify kinetic and potential energy changes during the phase change.

3.   White Board Activity – illustrate a solid, liquid , and a gas with definitions.

Period  9:

1. Work on the Cooling Curve Lab

a) Marking up the graph
b) completing the data questions and conclusion (need more time for this part)

LAB 4 -Cooling curve of an unknown substance .pdf

Ice melting animation

</div style=”max-width: 560px; margin: auto;”> 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

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10/13 –  Thursday – “B” Day homework:

1. Please complete the form posted below. You have 3 graded submissions to the form tonight.

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Connect

1: Heating Curve Form 2:

End Of Tuesday!

10/14 – Friday “A” Day

Main focus:
1. To Review main concepts of Energy, the first mechanical equivalents and current equivalents of Energy

2. To identify multiple forms of kinetic energy and how one can be converted into another.

3. To identify the stability of products or reactants during a reaction using Table I

Period  9:

1. Review last nights form (Heating Curve Form 2), especially Question 9!

2. Energy Intro lesson

3. Gummy Bear Demonstration

Gummy Bear Demo Notes:

In this demonstration potassium chlorate – K2ClO3 was heated to a liquid demonstrating an endothermic phase change and then decomposed into O2 and KCl.  The oxygen reacted with the sugar in the Gummi Bear exothermically.

1. melting the white solid:                  KClO3(s)  +  heat   —> KClO3(l)

2. hot liquid reacts:                            2KClO3(l)  +  heat    —>   2 KCl(s) +   3 O2(g)

3.  Sucrose (table sugar in gummi bear reacts with oxygen:

C12H22O11  +   35/2 O2   —>   12CO2  +   11H2O   +   heat (5635 kJ)                                                                                     sucrose

Today’s Lesson:   Based on this presentation

Today’s Lesson:   Lecture 1.11 – Energy Intro

Today’s Lesson:   Demonstrations – part 1

Today’s Lesson:   Demonstrations – part 2

10/14 –  Friday – “A” Day homework: –

No Homework this weekend!

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