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HW4: Due Mon Apr 25, Noon

A. Simulation Questions:Please go to the PhET website (http:phet!"olora#o!e#u$! %li"& 'pla

with si)s* an# +n# the appropriate si) or the proble) set! Here wewant 'Energ -or)s an# %hanges*! .egin with the intro tab! -or ea"h/uestion below, #o a )ini0e1peri)ent that illustrates so)e "on"ept inther)o#na)i"s! Ma&e sure to turn on the energ s)bols! The largeti"&s on the ther)o)eters represent , 5, an# 3%, an# the s)allti"&s are 3 apart!

3! Heat the water bath to as hot as ou "an! E1plain how, althoughthe bath is being heate#, the te)perature is not rising! se the+rst law!0The te)perature is no longer rising be"ause the water hasabsorbe# all o the energ in the sste) ro) the +re, an# there

is no )ore energ to gain!2! Heat the iron as hot as ou "an, an# "ool the bri"& as "ol# as ou"an, an# then put one on top o the other! tate what happens/ui"&l, an# then what happens slowl! 6s the a)ount o heat inea"h "ube e7er the sa)e80The bri"&9s te)perature /ui"&l rises! lowl, the bri"&9ste)perature "ontinues to rise while 6ron9s te)perature #e"reasesa s)all a)ount! The te)perature is e7entuall the sa)e in ea"h"ube!

! When ob;e"ts at #i)a"hine9 that uses the energ in

oo# to heat water!0The person on the bi""le )ust "onsu)e oo# to get energ,an# that energ is then transerre# into the wor& o the bi&e, an#the bi&e then turns a wheel to heat up the water! Energ isulti)atel transerre# ro) the oo# to the water!

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?! how how "lou#s "an interere with solar power to heat water!0%lou#s blo"& the sunlight ro) rea"hing the solar panel, sothereore the solar panel "annot absorb an energ to heat thewater!

@! se the stea) ro) the &ettle to heat water! Wh #oes no0oneuse this )etho# to generate power8

0tea) power isn9t as e"ient as other or)s o energ generationto#a!

B. Book Questions:-ro) %hapter 4, =uestions B,3,3C,5

B!i$ The topii$ The se"on# #rop0o< pointiii$ The botto)

3!

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A$ %arbon )ono1i#e, h#ro"arbons, nitrogen o1i#es.$ 6n"o)plete "o)bustions o the h#ro"arbons o gasoline%$

i$ %, %1Hii$ N1

3C! A$ %atalst.$ ea"tion 2%$ ea"tion 3

5!A$ 2 )illion barrels#a 1 ?5 #as F @! billion barrelsear.$ (@! billion barrelsear$( )illion people$F 24!

barrels"apita%$ 24! barrels 1 42 gallonsbarrelF3,2 gallons

C. Eminent chemistry question

3! Wh #oes Pro Dong want to +n# new "he)i"al pro"esses thatha7e ewer si#e pro#u"ts, i!e!, pro#u"ts that #i