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Q1: week 8 – 10/23 – 10/28

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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! 
 
Everyone needs to join Remind for class.  Click me to sign up.    
 
LAB 1 – 3 are LATE!!
LAB 4  – Cooling Curve of Unknown substance IS LATE!!
                             

________________________________________                                                   Jump to:  Monday Homework    10/23 – Monday – B Day – Lab   

Main focus – 
 

1. To identify an exothermic or endothermic reaction and its △H.
2. To complete a potential energy diagram for an exothermic or endothermic process.
3. To predict the temperature change of the of the surroundings in an exothermic or endothermic process.
4. To predict the whether more energy was needed to break bonds or make new ones in a chemical change.
 
Period  6:
 
1. Completed Lab 5 – Calorimetry of Metal Block Lab
a) Percent error calculations
b) error analysis/ conclusion – why most percent errors were negative
c) explained why temperature of water changed less than the metal.
d) Specific heat explained 
 
2.  Classwork Calorimetry Problem – 
 
Calorimetry Metal Block problems 1
 
a) In what direction was energy moving?
b) How does temperature change with this flow of thermal energy?
c) How does the energy measures from the metal block and water compare?
d) Why is there such a large difference in temperature change between the metal and the water if the energy lost and gained are the same?
e) What does a large or small specific heat quantify? 
 
Period  7:          
 
1.  Exothermic Gummy Bear and potassium chlorate (KClO3).
 
 2.  View the very Cool and Uplifting demo and take notes on the demo.
 
Regents Gummi Bear and Very Cool Demo Notes.pdf
                                                                                            

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

A VERY COOL DEMO: (Today’ s very Cool and “uplifting demo!”

Today’s Lesson:   Demonstrations of the two reactions today- part 1

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10/23 –  Monday  “B” Day Homework: 
 
1.  Please complete the backside of today’s worksheet using the Demonstrations – part 2 video below: 
 
Regents Gummi Bear and Very Cool Demo Notes.pdf

 

2.  Please complete the form based on both demonstrations today and the notes taken on the front side of the worksheet (done in class) and the notes taken from the backside (from the video below).

2  

Today’s Lesson:   Demonstrations – part 2

 
2: Demonstration Form:  

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 Main focus: 

1. To relate exothermic and endothermic chemical reactions in terms of breaking bonds and forming new bonds.
2. To define Stable vs. Unstable in terms of Potential energy
3. To identify reactants, products, and heat of reaction in potential energy diagrams.
4. To identify ∆H values in Table and determine if exothermic or endothermic.

 

Period  6:
 
1. Revisit the 2 demos and their reactions:
 
Regents Gummi Bear and Very Cool Demo Notes.pdf
a) Physical vs chemical – 
 
– Physical change increase in temp when endothermic and decrease in temperature when exothermic
– chemical do not change temp but make the environment warmer or cooler when they react. 
 
b) Exothermic vs Endothermic
c)  ∆H values
d) Stability of reactants or Products

e) Bonds broken vs. Bonds Formed

f) TABLE I reference Table!

 

A VERY COOL DEMO: (Today’ s very Cool and “uplifting demo!”

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

Today’s Lesson:   Lecture 1.11 – Energy Intro

Today’s Demo – circa 2008:   

_____________________________________________________                                                                           jump to:  top               10/24 – Tuesday’s Homework: –

1.   Please complete last nights form if you did not complete it. You have a total of three submissions. If YOU DID complete the form last night YOU can have ONE more submission.

2.   Please complete Energy Intro Form below:                                                                                                     
 
1: Energy Form 1:  

End Of Tuesday!

 ________________________________________________________________                    Jump to:  Wednesday Homework / top 10/25 – Wednesday – B Day – Lab                                 

 

Main focus: 

 
1. To identify the net change of energy of the environment during an exothermic and exothermic reaction
2. To identify that heat is ALWAYS absorbed to Break Bonds.
3.  To identify that heat is ALWAYS released to make new bonds.
4.  To Calculate the calories in a cheese curl.
 
Period  6:

1. Review the concepts from Monday (Demo Form) and Tuesday (Energy Intro) nights Forms.

2. Revisit the the Exothermic vs Endothermic changes due to NET changes with bonds broken and bonds formed using the Whoosh bottle demo.

3. Calorie vs. Joule – Presentation

 
4. We will solve another Bock in water Calorimetry problem.
 
Calorimetry Metal Block problems 1
 
Period  7:

                                                                                                                                                                                                                                    1. Perform Lab 6 – Calorimetry of a Cheese Curl.

 Lab 6 – Calorimetry of a Cheese Curl .pdf

                                                     

Calorie vs Joule:   

Calorimetry of a Cheeto:   Today’s Lab

Whoosh Bottle Demo:  exothermic, ∆H = -, temperature of the surroundings increases and products are more stable than the reactants!

_________________________________________________________                                                    jump to:  top            10/25 – Wednesday Homework: –

 
1. You may make one more submission to Monday or Tuesday nights form’s if you did not get a 100 after your allotted submissions.
 

__________________________________________________                                                                  Jump to:  Thursday Homework /top   10/26 – Thursday “A” Day – 

 
Main focus:   
 
1. To calculate the Joules of heat released from a Cheeto.
2. To calculate mass, joules, change of temperature and final temperature using the thermal heat equation.
 
Period  6:
 
1.  Calculate the Joules of heat released by the Cheeto AND absorbed by the water.
 – We are using yesterdays data from the lab.
 
Lab 6 – Calorimetry of a Cheese Curl .pdf
 
2.  We will practice some calorimetry problems from a class worksheet using the thermal equation posted in Table T! We have been using this equation for the last 2 labs!!

     

                                                q = m C ∆H

 

Calorimetry Problems 1 .pdf
View Download
 
Calorimetry problems 1 Key.pdf
View Download

 

Today’s Lesson:   Lecture 1.13 – Measuring energy

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10/26 –  Thursday – “A” Day homework: 
 
1. Please complete the form the second worksheet that we did not complete in class.  Calculate all of your answers and show all work on the worksheet. The second worksheet given out is called calorimetry problems 2.pdf.
posted below. It is based on the following worksheet that was handed out in class.
 
Calorimetry Problems 2 .pdf
View Download
 
2. Please complete the form below using the answers from the worksheet you just completed.
 
You have 3 graded submissions to the form tonight.
 
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1: Calorimetry Form 1:  

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10/27 – Friday “B” Day 

Main focus:   
 
1. To calculate the joules of energy in a Cheeto (Cheese Curl).
2. To Calculate the Calories in a Cheeto.
3. To Calculate the experimental Calories per gram of Cheeto.
4. To Calculate the theoretical Calories per gram of Cheeto.
5. To determine the difference between Calories and calories.
 
Period  6/7:
 
1. Review the Homework form.
 
2.  Draw and label the diagram of the apparatus of the Calorimetry Lab
 
3.  Calculate the experimental Calories per gram of the cheese curl.
 
4.  Calculate the Theoretical Calories per gram of the cheese curl.
 
Lab 6 – Calorimetry of a Cheese Curl .pdf

 

 
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Today’s Lesson:   Based on this presentation – Slides 32 – 37

Calorimetry of a Cheeto:   Today’s Lab

 
No Homework this weekend!
 
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