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Science Module

8th

Grade

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TAKS Objective 3 The student will

demonstrate an understanding of the

structures and properties of matter.

Complex interactions occur between

matter and energy.

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TEKS 8.1 !C"

The student knows that complex interactions

occur between matter and ener!" The

student is expected to#

identi$! and demonstrate that loss or

ain o$ heat ener! occurs durin

exothermic and endothermic chemicalreactions"

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#earning $b%ecti&es

%" identi$! endothermic and exothermic

reactions associated with chemical

chanes

&" 'xplain the loss or ain o$ heat durin

chemical reactions

3" (denti$! chemical and ph!sical chanes

associated with endothermic and

exothermic reactions

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'ac(ground

)eat* trans$er o$ ener!

http://www.visualsunlimited.com/images/watermarked/521/52172.jpg

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'xothermic* heat ener! '+(TS the s!stem

* ex" ,ombustion- evaporation o$ water

* surroundins usuall! $eel warmer

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Salt

An example o$ an exothermic

reaction is the mixture o$ sodium

metal and chlorine as which

!ields table salt"

)*a!s" + Cl)!g" )*aCl!s" + energy

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'ndothermic* heat ener! '.T'/S the s!stem

* ex" ,old packs- meltin ice

* surroundins usuall! $eel cooler

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,ow do cold pac(s wor(-

The outer pouch contains water" The inner pouch

contains ammoniumnitrate.

0hen !ou 1pop2 the inner pouch- the chemicalreaction absorbs heat ener! $rom thesurroundins" This is an endothermic reaction"

The temperature o$ the solution $alls to about 3 4

$or %5 to % minutes"

http://www.drugstore.com/products/prod.asp?pid=139637&catid=742&trx=GFI-0-EVGR-11690&trxp1=742&trxp2=139637&trxp3=1&trxp4=2&btrx=BUY-GFI-0-EVGR-11690http://www.drugstore.com/products/prod.asp?pid=139637&catid=742&trx=GFI-0-EVGR-11690&trxp1=742&trxp2=139637&trxp3=1&trxp4=2&btrx=BUY-GFI-0-EVGR-11690

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/hotosynthesis

6urin photos!nthesis- plants absorb the

ener! $rom the sun to convert carbon

dioxide and water into lucose and ox!en"

sunlight + 0C$)!g" + 0,)$!l" C0,1)$0!a" + 0$)!g"

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7h!sical chane* chane in sie- shape or

state o$ matter

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,hemical /eaction * process in which one

or more substances are chaned into

others" ,hemical reactions are

accompanied b! a loss or ain o$ ener!"

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True or 4alse

,hemical reactions alwa!s produce heat

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,hemical reactions can release or

absorb heat- but can also create

liht- sound or electricit!9

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True or 4alse

)eat can be lost- destro!edor just disappear

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)eat ener! is trans$erred $rom one object

to another- or is trans$erred to another

$orm o$ ener!- but never disappears"

Law of Conservation of Energy

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True or 4alse

,olor chane is alwa!s a ph!sical propert!

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,olor is a ph!sical propert!"

,olor chane can be the result

o$ a chemical chane"

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E*232E

,old 7acks

/ubber :ands

Glo*sticks

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E4/#$5E

)ot or .ot

; students explore endothermic and

exothermic chemical reactions usin bakin

soda and calcium chloride

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E4/#36*

%"

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3" 6escribe what happens with bakin soda

and calcium chloride are mixed"

=" 6escribe what happens with bakin

soda- calcium chloride and phenol red

are mixed"

" 0hat are evidences o$ chemical chane>

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?" (s this an endothermic or exothermic

reaction> )ow do !ou know>

@" Give three examples o$ exothermic

reactions in ever!da! li$e"

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E#3'$53TE

(ce (ce :ab!

; :akin soda and vinear

; (s this endothermic or exothermic> )ow do

!ou know>

; Give 3 examples o$ ever!da! endothermic

reactions"

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(ce ,ream

;Are the chanes ph!sical or chemical>

; (s the ice cream endothermic or exothermic>

)ow do !ou know>

; (s the icesalt mix endothermic or exothermic>

)ow do !ou know>

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E73#3T6$*

,omplete T!pe o$ ,hane> 'ndo'xo

chart

,omplete raph anal!sis Buestions