Energy Audit Homework

Where is Energy Audit--

Wednesday, December 15, 2010

8:47 AM

Goal: Begin to look at things from an energy transfer perspective. Answer the following questions at home this evening.  Due Thursday December 16th.

1.           At home this evening determine the type of energy used for

a.                 Heating the home

                                     i.                               What type of energy comes into the home

                                  ii.                               What type of energy is in the room to keep you warm

                                iii.                               How does energy transfer take place between these two things?

b.                 Electric Energy

                                     i.                               What things in the home use electric energy.

                                  ii.                               What type of energy do you think it was before electric energy? How do you know?

                                iii.                               What happens to all that electric energy in the home?

c.                  Why doesn't the home get warmer and warmer and warmer?

                                     i.                               Why does the heater in the home keep having to go on to keep the home warm?

                                  ii.                               How could you change your home to make it the same temperature and that you wouldn't have to keep warming the home as much?

                                iii.                               If you turn off the heat in the home it gets colder over time. Where does all this energy go? Is it lost?

Energy

Last week we started a unit on energy. The students learned about different forms of energy and that one way to describe energy is to call it a "substance like quality that has the ability to do things like warm something up, make it move, etc." We also learned that energy cannot be destroyed, instead it gets transferred from one form to another. We use a pie shape diagram to describe energy transfer so that the pie for a given system does not change in size, instead the pieces of pie change relative sizes as the action takes place. This week we will go into more depth around this concept by conducting an energy theater and having students practice using their math skills in using equations for stored gravitational energy, kinetic energy, and stored elastic energy.

CESA #2 Homework Assignment Due Friday Dec. 3rd

This school quarter is going to be shorter than the first quarter of school for 9th graders because we extended first quarter one week to provide for a better introduction to high school and now that we have had snow days, we have just too few days. Thus, I have decided to have students do their current events as homework instead of in class. Doing these in class provides me an opportunity to help students make sense of the science that is described in the article and we can do that on the day the CESA is due instead.

Students will receive a CESA article each week and complete a writeup of the article using the CESA guidelines provided in their logbook by the due date.

Here is the article about Mako Shark Skin

Here is the article about deer in the headlights.

Here is the article about elephant and mammal evolution after dinosaur extinction.

Here is the article about images illuminating the brain.

More Periodic Table Work

Below is a Periodic table showing the first 18 elements (3 periods) and electrons in those shells. Note the Group (column) and Period (row) similarities.

Density of the Elements

CHEMIX School Periodic table of Elements - Density Chart of Elements

Density of molecules and compounds

Check out the density of many substances

material	density (kg/m3)		material	density (kg/m3)
acetone	790		kerosene	810
acid, acetic (CH3COOH)	1050		lard	919
acid, hydrochloric (HCl)	????		lead	11,350
acid, sulfuric (H2SO4)	1390		lithium	534
air, 100 K	3.556		lithium 6 deuteride	820
air, 200 K	1.746		lungs	400
air, 293 K	1.207		mayonnaise, traditional	910
air, 300 K	1.161		mayonnaise, light	1000
air, 500 K	0.696		methane, gas, +25 ℃	0.656
air, 1000 K	0.340		methane, liquid, −90 ℃	162
alcohol, ethyl (grain)	789.2		milk, cow, heavy cream	994
alcohol, isopropyl (rubbing)	785.4		milk, cow, light cream	1012
alcohol, methyl (wood)	791.3		milk, cow, whole	1030
ammonia	771		milk, cow, skim	1033
aluminum	2700		mercury	13,594
argon, gas, ~300 K	1.449		monosodium glutamate	1620
argon, liquid, 87 K	1430		nickel	8900
beer, pilsner, 4 ℃	1008		nitrogen (N2), gas, ~300 K	1.145
benzene	870		nitrogen (N2), liquid, 74 K	808
blood	1035		oil, vegetable, coconut	924
body fat	918		oil, vegetable, corn	922
bone	1900		oil, vegetable, olive	918
butane	551		oil, vegetable, palm	915
butter	911		oil, vegetable, peanut	914
carbon	2250		oil, vegetable, soya	927
carbon dioxide, gas, +25 ℃	1.799		osmium	22,500
carbon dioxide, solid, −78 ℃	1562		oxygen (O2), gas, ~300 K	1.308
copper	8960		oxygen (O2), liquid, 87 K	1155
corn starch, loosely packed	540		perchlorethylene	1600
corn starch, tightly packed	630		platinum	21,450
corn syrup	1380		plutonium, α	19,860
diesel	800		salt (sodium chloride)	2165
formaldehyde	1130		silicon	2330
freon 12, liquid	1311		silicon dioxide (quartz)	2600
freon 12, vapor	36.83		silicone	993
gasoline	803		silver	10,490
glycerine	1260		skin	1050
gold	19,300		sodium bicarbonate	2200
grain, barley	620		sugar, sucrose	1550
grain, corn, shelled	720		titanium	4500
grain, corn, ear	900		tungsten	19,300
grain, flax	770		uranium	19,050
grain, millet	640		water, liquid, 100 ℃	958.40
grain, oats	410		water, liquid, 50 ℃	988.03
grain, rice, rough	580		water, liquid, 30 ℃	995.65
grain, rice, hulled	750		water, liquid, 20 ℃	998.21
grain, rye	720		water, liquid, 10 ℃	999.70
grain, wheat	770		water, liquid, 4 ℃	999.98
helium, gas, ~300 K	0.164		water, liquid, 0 ℃	999.84
helium, liquid, 4 K	147		water, ice, 0 ℃	916
hydrogen (H2), gas, 300 K	0.082		water, ice, -50 ℃	922
hydrogen (H2), liquid, 17 K	71		water, ice, −100 ℃	927
honey	1420		water, sea	1025
iron	7870		zinc	7140
iridium	22,400

CESAs (Current Events in Science)

Each week we do current events in science. The learning goal for CESAs is that

1. Students read and understand current science literature.
2. Students read about scientists doing very ineresting  and compelling work as some of the concepts studied in 9th grade science class are more basic.
3. Students learn about and become proficient at identifying variables and controls used in scientific studies.
4. Students demonstrate understanding by writing up their CESA in a format that uses 5 habits of mind.

CESAs are an example of how differentiation happens in this science classroom. Most weeks, I bring several different readings that students can choose from in a wide range of reading levels. Students are asked to choose options that are difficult but not impossible for them. Most weeks there are honors options for students wishing to obtain honors credit in this class.