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Grade. 7. Sci e nce. Homogeneous. &. Heterogeneous Mixtures. Homogeneous. Mixture. Stainless steel. •. also called solutions can be solid, liquid or gas. •. •. the particles are evenly mixed so that no n e of the origi n al sub s tances are visi b le. Koo l - aid. •.

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Presentation Transcript
slide1

Grade

7

Science

Homogeneous

&

Heterogeneous

Mixtures

slide2

Homogeneous

Mixture

Stainlesssteel

alsocalled

solutions

canbe solid,liquid or gas

slide3

theparticles

areevenlymixedso thatnoneof theoriginalsubstancesare

visible

Kool-aid

slide4

they appear

tobe ONE

substance

light passesthrough

unaffected

slide5

Heterogeneous

Mixtures

alsocalled

mechanical

mixtures

canbe solid,

liquid or gas

Granolabar

slide6

thedifferentparts

arevisibletotheeye(mayneedamicroscope)

the particlesdonot evenlymix

Concrete

slide7

Light will

reflectperpendicularto thedirectionof

the beam

slide8

Student

Activity...

Createachartandlistthe

varioushomogeneousandheterogeneousmixturesinyourhome.

Sharewithyourshoulder

partnerandaddtoyourlist.

slide9

The

Tyndall

Effect

A phenomenonthat canbe used

to distinguish betweensolutions

andwhat appears

solution

cannotbe usedto

to be a

distinguish

betweena solution and a pure

liquid

slide10

In

a

Solution...

Light passes

unaffected(if astudentlooksat the beakerperpendicularto thedirectionof thebeam

theywill NOTsee it

slide11

In

a

Mechanical

Mixture...

The light will

scatter

asit passesthrough

the mixture becauseall particles arenotdissolved(as shown

onthe left)

slide12

Both

Hetero

and

Homogenoeus

Mixtures?

CompleteActivity 7-1C

Page238 & 239

slide13

Post

Activity

Discussion...

Enrichment