Academic Chemistry Unit 2 Test Review TEST on Thursday 9/25

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1 Academc Chemstry Unt 2 Test Revew TEST on Thursday Descrbe the followng: b. Chemcal Energy: C>,2. As thetemperatureof asamp!e of matter decreases, what happens to the average knetc energy of the partcles n the sample?, "ÿ" L)._,,).... What s the law of conservaton of energy? d, When a candle burns, what happens to the heat energy produced by that system? An equal amount of heat was absorbed by the surroundngs An equal amount was produced by the unverse c. An equal amount was absorbed by the unverse d. An equal amount was produced by the surroundngs 5. Descrbe tÿe-dr,ÿ_cton of heat flow that occurs as your ce cream melts on the sdewalk.!.ÿ:'ÿ,!?m,,:hÿ:ÿ:ÿ'ÿ"ÿ... ÿ:ÿ.---. <ÿ':ÿ ÿ ÿ,._.. ÿ. -.ÿ.ÿ-ÿ,ÿ k... "-: ÿ._<' c :ÿ'_ ÿ:ÿ v% C.'ÿ'ÿ.ÿ,-ÿ 6. Descrbe the drecton of heat flow that occurs as ce s made n a.ÿfreezer. Drectons: Oyour answer choces wthn the followng statements. Answer choces are n all CAPS., In an endothermc reacton, heat s ÿ1ÿ> RELEASED by the system. As a result, the system wll haveÿmÿ01rÿ;ÿ LESS energythan t dd orgnally and the sullroundngs wll have MORE,ÿLESS-ÿ energy. Ths wÿlfÿuse an endothermc reacton to feel HOT ÿco.ÿ_ld.-. ), In an exotheÿmc reacton, heat s ABSORBED ÿ) by the system. As a result, the system wll have MORE (..ÿle. ss.ÿ energy than t dd orgnally and the surroundngs wll havÿ:"iviÿidrei) LESS energy. Ths wll cause an exothermc reacton to feelÿ14ot.v COLD. "ÿ": Durng a phase change from sold to lqud, the temperature of a substance- :ÿ: (ÿ\ÿ'ÿ'ÿ ÿ C

2 INCREASES DECREASES S CONSTA?'ÿ 10. Durng a phase change from sold to lqud, the heat of a substance - (ÿ"ÿ INCREASESÿ DECREASES STAYS CONSTANT. 11. Durng a phase change from gas to lqud, the temperature of a substance - INCREASES DECREASES (J STAYS CONSTANT.ÿ 12, Durng a phase change from gas to lqud, the heat of a substance - INCREASEÿ:ÿfÿ[gEÿCRE-ASES ":ÿ STAYS CONSTANT. 13. Defne specfc heat: \ÿ\(2... t < 14. Defne calore: 15. What s the dfference between the two prevous defdtons? 16. A process 1hat absoÿ:6s (taÿeÿs ÿ) heat IS ÿlfeÿÿ ÿ-dÿÿ ÿ;ÿf 17. What s large,[one caloreÿor one joule? 18. Defne: ' I ' a. Joule:, ÿ1 ÿ ÿ 'ÿ' ÿ ÿ t,' ' \ <!)I ), b. endothermc:,ÿ ÿ,,,f, d 02' ] \ \ 19. A Cheeto has 13 Calores (or calores).f t could be burned, leavng nothng but carbon doxde and water, how much heat would be gven off? tÿ \ÿ ÿ,, 1,',!,,:' ÿ': ÿ ÿ ÿ ÿ' 'ÿ",, 20. What varable represents specfc heat n the formula Q = mcpat? 21. What varable represents heat n the formula Q = mcpat? 22

3 Calculate 22. HQw much hÿat does t take to warm 37.0g of pure water from 45.00C to 67.50C f the specfc heat of water s 4.ÿ8 J= c7 (ÿ... r-ÿ,. ÿ?. D,Iÿ L... & 22. How much heat s requred to rase the temperature of g of mercury from 48.0 C to C? specfceatof Mercury : Jg C :, (,ÿ) [v,, %,... W Is ths process endothernÿcor'sti?ÿ Justfy your answer (hnt: what s the charge of Q?). 23. Alumnum has a specfc heat of ÿ ÿ7 t up n your table lor #25). How much t ' heat s lost when a pece of alumnum wth a mass Of g cools from a temperature of Cto a temperature of 22.0 C? W ("ÿ'ÿ ÿ ÿÿ'ÿ ÿ... II).:(S,G Iÿ)" ÿ ÿ"ÿ ÿ "':ÿ?ÿ'>+'ÿ" 24! Hbw much heat s requred'to rase the temperature of g of mercury from 48.00C to C? Specfc heat Of Mercury = Jg C,. q j! } I!,, I I " I, lÿ tb's process "... erÿdotherm c or eÿ6thermc? Justfy your answer (hnt; whats the charge of Q?).!, 25. You heat ÿat1 me:al, f:,ÿol SUBSTANCE Coÿpÿr Golÿl Mercury nknown m etÿ' determne that Sp#cffÿc Hÿ at ÿecfc Hÿat (loulesl.ÿoc) ÿ(ÿo,'esÿ C ) 'om 30.0 C to 400ÿ,... You know t hay absorbed 190.,J of tÿeat n ths process, \ 1.oo,-.ÿ" mass of 50.Og. What s the 23

4 @ 9O E 6O 3O I Tme (m!nuteÿs) Usnq *he heatng curve above, answer the follown9 questons. 25. Whch segments represent an ncrease n knetc energy Whch segments represent an ncrease n potental energy? Whch segments change wth temperature? Whch segments represent phase changes? 29. Whch segment represents a: Sold? Lqud? Gas? 30. What s the meltng pont of ths substance? 31. What s the freezng pont of ths substance? 32. What s the bolng pont of ths substance? 33. What s the condensaton pont of ths substance? q (: <::, 34. Whch segment represent both a sold and a lqud? 35. How many mnutes dd ths substance take to melt? 36. Is ths the heatng curve of water? ÿfa Justfy your answer: 24

5 Crcle the correct answer for each of the followng sources for endothermc reactons and exothermc reacton: Extng (released) Enterng (absorbng) decreasng Increasng Increasng ('..d ec r..e a s ng...ÿ) cold Less energy : More energy More energy Less energy \ 25

substances (among other variables as well). ( ) Thus the change in volume of a mixture can be written as

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