# Pages CH217 - Home CH217 - Homework Page History

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h2. &nbsp;Homework Assignment 1: General Chemistry Review (due 2/8/2010)

# Get a General Chemistry text that you may use as a reference for the semester.
# Complete the attached CH141 and CH142 exams (you may consult each other, but must submit your own work).&nbsp; Please turn in a hard copy in class.
[^Ch142 Final 2000.pdf]&nbsp;&nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;[^CH141 Final Exam 2003.pdf]&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;

h2. Homework Assignment 2: Room Energy Audit (due 2/15/2010)

Every student will help prepare a Colby student energy audit of electrical appliances used by the student body.&nbsp; Start by claiming an appliance by adding your name to the table below.&nbsp; You may fill in the rest of your row at a later date.
|| Name || Appliance \\ || Energy Consumption (J/year) \\ || Number on Campus \\ || Total Energy \\ ||
| example | microwave | 3.73 * 10^4 kJ/year | 1077.1 | 4.01 * 10^7 kJ \\ |
| Sarah | Cell chargers | 1.45 \*10^7 J/year \\ | 1764 | 2.56 \*10^7kJ \\ |
| Andy | Laptop chargers | | | |
| Reuben | Televisions | | | |
| Erin | Hair Straighteners | 1.96 * 10^7 J/year | 966.7 | 3.45 \*10^7 kJ |
| Rachael | Lamps | 9.58 E7 J/yr | 1717 | 1.65 E8 kJ |
| Amy | Refrigerators \\ | | | \\ |
| Devon \\ | Speakers | 6.93 * 10^7 J/year \\ | 1235 | 8.56 * 10^7 kJ \\ |
| Mike | Electric Razors | 1.79 * 10^3 J/year | 706 | 1.26 * 10^5 kJ |
| Kimberly \\ | clocks \\ | 1.36 x 10^8 J/yr \\ | 752 \\ | 2.4 x 10^8 kJ/yr \\ |
| Greg \\ | Coffee Maker \\ | 1.281 x 10^5 kJ/year \\ | 176.4 \\ | 2.260 x 10^7 kJ/yr \\ |
| Josie \\ | Microwave \\ | | | |
| Trevor \\ | Gaming Console  \\ | | | |
Once you have selected the appliance, survey 10 or more rooms to get a statistical sampling of the appliance frequency on campus.&nbsp; Determine the energy consumed by the appliance over the course of the academic year and compute the total energy consumed by all students using the appliance.&nbsp; Put your data in the table above and provide the details on your appliance and your calculations below.&nbsp; This assignment is only submitted on this page.

*Post answers to assignment 1 below:&nbsp; (list name, appliance, and then details)*
*Steve Jobs, Apple laptop computer*

&nbsp;&nbsp;&nbsp; Details on the calculations for computer energy consumption ....

\_______________________________________________________________________________________________&nbsp;

*Example, Blow Drier*
| | Brand | Voltage (V) | Current (A) | Power (W) |
| 1 | Jilbere | 125 | 10 | 1250 |
| 2 | Physique | 125 | 15 | 1875 |
| 3 | Revlon | 125 | 15 | 1875 |
| 4 | Conair | 125 | 15 | 1875 |
| 5 | Perfection Classic | 125 | 15 | 1875 |
| 6 | Vidal Sassoon | 125 | 15 | 1875 |
| 7 | Conair | 125 | 15 | 1875 |
| 8 | Conair | 125 | 15 | 1875 |
| 9 | Conair | 125 | 15 | 1875 |
| 10 | Conair | 125 | 15 | 1875 |
| Average | | | | 1812.5 |
Average Energy Consuption a year assuming 10 minutes daily use.

1812.5 J/sec * 60 sec/min * 10 min/day * 365 day/year = 3.97E8 J

Assuming every female (54.8%) on campus and no males use a blow dryer (some guys have hair driers)

3.97E8 J * 1867 * 54.8% = 4.06E11 J = 4.06E8 kJ

----
&nbsp;Electric Razors
|| Sample # || Brand || Use (min/week) || Voltage (J/c) || Current (c/sec) || Power (J/sec) ||
| 1 | Braun | 10 | 12 | 0.400 | 4.8 |
| 2 | Braun | 12 | 12 | 0.400 | 4.8 |
| 3 | No Razor | | | | |
| 4 | No Razor | | | | |
| 5 | No Razor | | | | |
| 6 | Phillips Norelco | 7 | 15 | 0.420 | 6.3 |
| 7 | Phillips Norelco | 12 | 15 | 0.420 | 6.3 |
| 8 | No razor | | | | |
| 9 | No razor | | | | |
| 10 | No razor | | | | |
| Average | 40% of student body | 10.25 | | | 5.6 |
&nbsp;Average Energy Consumption:

5.6 J/sec * 60 sec/min * 10.25 min/week * 52 weeks/year = 1.79 * 10^3 J/year

Assuming only males use electric shavers

1.79 * 10^3 J/razor/year * 1764 students * 0.40 razors/student * 1J/1000kJ = 1.26 * 10^5 kJ/year

Devon McIntyre, iPod/Computer Speakers
|| Sample # \\ || Brand \\ || Voltage (V) \\ || Current (A) \\ || Power (W) \\ ||
| 1 \\ | Altec Lansing, \\
InMotion \\ | 100 - 240 \\ | 0.8 \\ | 80 \\ |
| 2 \\ | Logitech \\ | 120 \\ | 0.525 \\ | 63 \\ |
| 3 \\ | Bose \\ | 120 \\ | 0.16 \\ | 19.2 \\ |
| 4 \\ | Bose \\ | 120 \\ | 0.16 \\ | 19.2 \\ |
| 5 \\ | JBL \\ | 120 \\ | 0.183 \\ | 22 \\ |
| 6 \\ | JBL \\ | 120 \\ | 0.183 \\ | 22 \\ |
| 7 \\ | JBL \\ | 120 \\ | 0.183 \\ | 22 \\ |
| 8 \\ | Klipsch \\ | 100 - 240 \\ | max 1.5 \\ | 150 \\ |
| 9 \\ | iSymphony \\ | 120 \\ | 0.9 \\ | 108 \\ |
| 10 \\ | JBL \\ | 120 \\ | 0.183 \\ | 22 \\ |
| Average \\ | | | | 52.74 \\ |

Average energy consumption in a year assuming speakers are used 1 hour per day:

52.74 J/sec&nbsp;*&nbsp; 60 sec/1 min&nbsp; \*&nbsp;60 min/1 day&nbsp; \*&nbsp; 365 days/1 year&nbsp; =&nbsp;6.93 E7 J/year

Colby students total -- 1838

% Colby students on campus -- 96%

Total Colby students on campus -- 1764

Assume 70% of students have speakers -- 1764 &nbsp;*&nbsp;.70&nbsp; =&nbsp; 1235 students with speakers on campus

1235*&nbsp;\* \*&nbsp; 6.93 E7 J &nbsp;= &nbsp;8.56 E10 J &nbsp;=&nbsp; *8.56 E7 kJ/year*

\_______________________________________________________________________________________________&nbsp;

Rachael Mack: Lamps
| | Brand | Voltage (V) | Current (A) | Power (W) |
| 1 | Walmart | 120 | 0.5 | 60 |
| 2 | | 120 | 0.33 | 40 |
| 3 | Your Zone | 120 | 0.33 | (40*5 bulbs) 200W |
| 4 | | 120 | 0.33 | 40 |
| 5 | Jansjo | 120 | 0.09 | 10.8 |
| 6 | Jansjo | 100 | 0.09 | 0.09 |
| 7 | Walmart | 120 | 0.12 | 14 |
| 8 | | 120 | 0.5 | 60 |
| 9 | | 120 | 0.33 | 40 |
| 10 | Walmart | 120 | 0.12 | 14 |
| Average | | | | 48.78 |

Assuming there is on average one lamp per person, and each person uses it daily for about 1.5 hours. (Approximately 93% of the total student body lives on campus -- 1717 students.)

48.78 J/s * 60 s/min * 90 min/day * 365 day/yr = 9.61 E7 J/yr

9.61 E7 J/yr * 1717 students = +1.65 E8 kJ/yr+

\_______________________________________________________________________________________________&nbsp;
\*Reuben Biel, Television\*

| Room No | Brand | Volt (V) | Current (A) | Wattage (W) | Time   (hrs_used/day) | Occupants | Gender | kJ Used per Room   per Day | kJ Used per   Individual per Day |
| 1 | Sylvania | 120 | 0.44 | 53 | 0.57 | 3 | M | 109.0285714 | 36.34285714 |
| 2 | Emerson | 120 | 0.5 | 60 | 1 | 2 | F | 216 | 108 |
| 3 | \--\- | 0 | 0 | 0 | 0 | 2 | M | 0 | 0 |
| 4 | Orion | 120 | 0.92 | 110 | 1 | 2 | F | 396 | 198 |
| 5 | Olevin | 120 | 1 | 100 | 1.5 | 3 | M | 540 | 180 |
| 6 | \--\- | 0 | 0 | 0 | 0 | 2 | F | 0 | 0 |
| 7 | \--\- | 0 | 0 | 0 | 0 | 3 | M | 0 | 0 |
| 8 | Emerson | 120 | 0.46 | 55 | 1 | 2 | F | 198 | 99 |
| 9 | Magnavox | 120 | 2 | 240 | 0.57 | 1 | M | 493.7142857 | 493.7142857 |
| 10 | Magnavox | 120 | 0.33 | 40 | 5 | 1 | M | 720 | 720 |
| 11 | RCA | 120 | 0.46 | 55 | 1.5 | 1 | F | 297 | 297 |
| 12 | LG | 120 | 1.25 | 150 | 6 | 1 | M | 3240 | 3240 |
| 13 | Insignia | 120 | 0.58 | 70 | 0.5 | 0.5 | F | 126 | \--\- |
| 13A | LG | 120 | 1.25 | 150 | 2 | 0.5 | F | 1080 | \--\- |
| 13 Total | | 0 | 0 | 0 | 0 | 1 | F | 0 | 1206 |
| 14 | \--\- | 0 | 0 | 0 | 0 | 1 | F | 0 | 0 |
Assuming that Televisions only draw energy while being used (false assumption so is an underestimate of actual usage):
Average Usage per Female per Day (including those without TVs): 273 kJ/day
Average Usage per Male per Day (including those without TVs): 667 kJ/day
If there are approx. 960 females (54.8%) and 790 males on campus (Total 1750 students), then:
Total Female Usage per Year = 273 kJ/female-day*365 days/yr*960 females = 9.55E7kJ/yr
Total Male Usage per Year = 667 kJ/female-day*365 days/yr*790 males = 1.92E8kJ/yr
Total Energy Usage per Year = 9.55E7kJ/yr + 1.92E8kJ/yr = *2.88E8kJ/yr*
----

\| {color:black}{*}Room{*}{color} \| {color:black}{*}Brand{*}{color} \| {color:black}{*}Voltage (V)*{color} \| {color:black}{*}Current (A)*{color} \| {color:black}{*}Power (W)*{color} \|
| {color:black}1{color} | {color:black}0{color} | {color:black}0{color} | {color:black}0{color} | {color:black}0{color} |
| {color:black}2{color} | {color:black}0{color} | {color:black}0{color} | {color:black}0{color} | {color:black}0{color} |
| {color:black}3{color} | {color:black}0{color} | {color:black}0{color} | {color:black}0{color} | {color:black}0{color} |
| {color:black}4{color} | {color:black}Timex{color} | {color:black}120{color} | {color:black}0.05{color} | {color:black}6{color} |
| {color:black}5{color} | {color:black}Memorex{color} | {color:black}15{color} | {color:black}1{color} | {color:black}15{color} |
| {color:black}6{color} | {color:black}Sony{color} | {color:black}120{color} | {color:black}0.04{color} | {color:black}5{color} |
| {color:black}6{color} | {color:black}0{color} | {color:black}0{color} | {color:black}0{color} | {color:black}0{color} |
| {color:black}6{color} | {color:black}0{color} | {color:black}0{color} | {color:black}0{color} | {color:black}0{color} |
| {color:black}7{color} | {color:black}Sony{color} | {color:black}120{color} | {color:black}0.04{color} | {color:black}5{color} |
| {color:black}8{color} | {color:black}RCA{color} | {color:black}22{color} | {color:black}1{color} | {color:black}22{color} |
| {color:black}8{color} | {color:black}iPod{color} | {color:black}15{color} | {color:black}1.5{color} | {color:black}22.5{color} |
| {color:black}9{color} | {color:black}0{color} | {color:black}0{color} | {color:black}0{color} | {color:black}0{color} |
| {color:black}9{color} | {color:black}0{color} | {color:black}0{color} | {color:black}0{color} | {color:black}0{color} |
| {color:black}9{color} | {color:black}0{color} | {color:black}0{color} | {color:black}0{color} | {color:black}0{color} |
| {color:black}10{color} | {color:black}0{color} | {color:black}0{color} | {color:black}0{color} | {color:black}0{color} |
| {color:black}11{color} | {color:black}0{color} | {color:black}0{color} | {color:black}0{color} | {color:black}0{color} |
| {color:black}12{color} | {color:black}Sony{color} | {color:black}120{color} | {color:black}0.04{color} | {color:black}5{color} |
| {color:black}13{color} | {color:black}0{color} | {color:black}0{color} | {color:black}0{color} | {color:black}0{color} |
| {color:black}14{color} | {color:black}Sony{color} | {color:black}120{color} | {color:black}0.04{color} | {color:black}5{color} |
| {color:black}15{color} | {color:black}Memorex{color} | {color:black}120{color} | {color:black}0.04{color} | {color:black}5{color} |
| {color:black}16{color} | {color:black}0{color} | {color:black}0{color} | {color:black}0{color} | {color:black}0{color} | |

*Number of students with alarm clocks:*

9/21 students in the survey = 43 % x \~1750 students on campus = 752 students

Average power use of alarm clocks: 10.0 W

Total Average power use (including non-owners): 4.3 W

*Yearly Average Power Use per student:*

4.3 J/sec x 60 sec/min x 60 min/hr x 24 hr/day x 365 day/yr = 1.36 x 10^8 J/yr

*Campus Power use:*

1.36 x 10^8 J/yr x 1750 students = 2.40 x 10^11 J/yr x 1 kJ/1000 J *= 2.40 x 10^8 kJ/yr*
----
Josie Thiele, Microwave Oven
| | Brand | Voltage (V) | Current (A) | Power (W) |
| 1 | Cuisinart | 120 | 8 | 1000 |
| 2 | | 120 | 8 | 1000 |
| 3 | GE | 120 | 9 | 1100 |
| 4 | | 120 | 9 | 1100 |
| 5 | LG | 120 | 13 | 1500 |
| 6 | | 120 | 13 | 1500 |
| 7 | | 120 | 13 | 1500 |
| 8 | Sharp | 120 | 9 | 1100 |
| 9 | | 120 | 9 | 1100 |
| 10 | Frigidaire | 150 | 6 | 900 |
| Average | | | | 1180 |
Assuming that there is one microwave per room (and each room has 2 people in it), and each room uses it for 20 minutes a day.&nbsp;

*Yearly Average Power Use per microwave*

1180J/s*60s/min*20min/day*365day/yr*1kJ/1000J=5.2*10^5kJ/yr

*Annual Campus Power Use*

Assuming there is one per room, \~875 rooms

5.2*10^5kJ*875rooms=4.6*10^8kJ/yr

\*Erin Schnettler-Hair Straightners
| Sample | Brand | Voltage (V) | Power (W) |
| 1 | Emperor | 110V | 200W |
| 2 | Solia | 110V | 58W |
| 3 | Sedu | 110V | 72W |
| 4 | Solia | 110V | 58W |
| 5 | CHI | 110V | 35W |
| 6 | Sedu | 110V | 72W |
| 7 | Conair | 120V | 36W |
| 8 | Solia | 110V | 58W |
| 9 | Hot Tools | 110V | 170W |
| 10 | Solano | 110V | 135W |
| Avg. || 89.4W |

\--Average Energy Consumption per year assuming 10 minutes of daily use
89.4J/sec*(60sec/min)*(10min/day)*(365days/year)=19578600 J/year

\--Avg. Energy Consumption per year assuming that use is limited to all females on campus:
19578600 J * 1,764 students * .548 =3.454*10^10 J (1 kJ/1000 J) = 3.45*10^7 kJ/year

\_______________________________________________________________________________________________&nbsp;

*Greg Klein: Coffee Makers*

| | Brand | Voltage (V) | Current (A) | Power (W) |
| 1 | Mr. Coffee | 120 | 7.5 | 900 |
| 2 | | 120 | 7.5 | 900 |
| 3 | Black and Decker | 120 | 10 | 1200 |
| 4 | Cuisinart | 120 | 13.833 | 1660 |
| 5 | | 120 | 13.833 | 1660 |
| 6 | Cuisinart | 120 | 9.166 | 1100 |
| 7 | | 120 | 9.166 | 1100 |
| 8 | Hamilton Beach | 120 | 7.5 | 900 |
| 9 | Hamilton Beach | 120 | 12 | 1140 |
| 10 | | 120 | 12 | 1140 |
| Average || 1812.5 |

*Assuming about one in ten students has a coffee maker:*

0.1	x 1764 students = 176.4 students

*Average yearly power consumption, assuming 5 minutes daily use:*

1170 J / sec x 60 sec / min * 5 min x 365 = 1.281 x 10^8 J / year

*Total power consumption for the campus:*

1.281 x 10^8 (J / year x students) x 176.4 students = 2.260 x 10^10 J / year

*2.260 x 10^7 kJ / year*

----
*Andy Oakes, Laptop Chargers*

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\-->\| Sample \| Brand \| Voltage \| Current \| Power \|
| 1 | Macbook | 16.5V | 3.65A | 60W |
| 2 | Macbook Pro | 16.5V | 3.65A | 60W |
| 3 | Dell Latitude | 19.5V | 3.34A | 65W |
| 4 | Dell Inspiron | 19.5V | 3.34A | 65W |
| 5 | Macbook Pro | 16.5V | 4.6A | 85W |
| 6 | HP Compaq | 19V | 4.74A | 90W |
| 7 | Macbook Pro | 16.5V | 3.65A | 60W |
| 8 | Macbook | 16.5V | 3.65A | 60W |
| 9 | Dell Inspiron | 19.5V | 3.34A | 65W |
| 10 | Gateway NV | 19V | 4.74A | 90W |
| Average | | | | 70W |

Average Energy Consuption a year assuming 10 minutes daily use.

1812.5 J/sec * 60 sec/min * 10 min/day * 365 day/year = 3.97E8 J

Assuming every female (54.8%) on campus and no males use a blow dryer (some guys have hair driers)

3.97E8 J * 1867 * 54.8% = 4.06E11 J = 4.06E8 kJ
----
Sarah Dallas-\- Cell Phone Chargers

|| sample || brand \\ || voltage (V) \\ || current (A) \\ || Power (W) \\ ||
| 1 \\ | LG \\ | 5 \\ | 1 \\ | 5 \\ |
| 2 \\ | BlackBerry \\ | 5 \\ | 0.7 \\ | 3.5 \\ |
| 3 \\ | BlackBerry \\ | 5 \\ | 0.7 \\ | 3.5 \\ |
| 4 \\ | Samsung \\ | 5 \\ | 0.7 \\ | 3.5 \\ |
| 5 \\ | LG \\ | 5.1 \\ | 0.7 \\ | 3.57 |
| 6 \\ | LG \\ | 5.1 \\ | 0.7 \\ | 3.57 \\ |
| 7 \\ | Motorola \\ | 5 \\ | 0.55 \\ | 2.75 |
| 8 \\ | LG \\ | 4.8 \\ | 0.9 \\ | 4.32 |
| 9 \\ | LG \\ | 5.1 \\ | 0.7 \\ | 3.57 |
| 10 \\ | BlackBerry \\ | 5 \\ | 0.7 \\ | 3.5 |
| Average \\ | | | | 3.678 |
1764 chargers on campus, because every student has a cell phone

Assume they are used by everyone for 3 hours a day every day of the year

3.678 J/sec * 60 sec/min * 60 min/hr * 3 hr/day * 365 days/yr = *1.45E7 J/yr*

Power*#of chargers >> 1.45E7 * 1764 = 2.56E10 J >> *2.56E7 kJ*
----
Trevor Poole - Game Consoles

||
Sample # || Brand || Use (min/day) || Voltage (J/c) || Current (c/sec) || Power (J/sec) ||

|||| Sample # || Brand || Use (min/week) || Voltage (V) || Current (A) || Power (W) ||
| 1 | Xbox 360 | 120 | 12 | 12.1 | 150 |
| 2 | None | 0 | 0 | 0 | 0 |
| 3 | None | 0 | 0 | 0 | 0 |
| 4 | Xbox 360 | 60 | 12 | 14.2 | 175 |
| 5 | None | | | | |
| 6 | Wii | 90 | 12 | 3.7 | 33 |
| 7 | None | 0 | 0 | 0 | 0 |
| 8 | Xbox 360 | 90 | 12 | 14.2 | 175 |
| 9 | Wii | 90 | 12 | 3.70 | 33 |
| 10| None| | | | |

40% of rooms total have game consoles, however all surveyed were male.  1764 total students * (.4 (males on campus) * .5 (males with game consoles)) =.2 total, or 353 game consoles on campus

Used for an average of 90 minutes per day

113.2J/s * 60seconds/minute * 60 mins/hour * 1.5 hours/ day * 365 days/year = 223,117.2 kJ per year per console.

223,117.2 kJ * 353 consoles = 78,760,371.6 kJ

```