Notes2x

plantcitybusinessUrban and Civil

Nov 26, 2013 (3 years and 8 months ago)

72 views

Grade

7

Sci
e
nce

Homogeneous

&

Heterogeneous

Mixtures

Homogeneous

Mixture



also

called

solutions

can

be


solid,
liquid

or

gas




Stainless

steel



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



they

appear

to

be

ONE

substan
c
e

light

passes
through

unaffected



Heterogeneous

Mixtures



also

called

mechanical

mixtures

can

be

solid,

liquid

o
r

gas



Granola

bar



the

di
f
ferent

parts

are

visible

to

the

eye

(may

need

a

microscope)

the

particles

do
not


evenly

mix



Co
n
crete



Light

will

reflect
perpendicular
to

t
he
direction

of

the

beam

Student

Activity...



Create

a

chart

and

list

the

various

homogeneous

and

heterogeneous

mixtures

in

your

home
.

Share

with

your

shoulder

partner

and

add

to

your

list
.



The

T
y
ndall

E
ffect



A

phenomenon

that

can

be

used

to

d
i
stinguish

b
e
tween

solutions

and

what

appears

solution

cannot

be

used

to

to

be

a



distinguish

between

a

solut
i
on

and

a

pu
r
e

liquid

In

a

Solution...



Light

pas
s
es

unaffected

(if

a

stude
n
t
loo
k
s

at

the

beaker
perpendicular

to

the
direction

of


the

beam

they

will

NOT

see

it

In

a

Mechanical

Mixture.
.
.



The

l
ight

will

sc
a
tter

as

it

pas
s
es

through

the


m
i
xture

becau
s
e
all

part
i
cles


are

not
dissolved

(as

shown

on

the

left)

Both

Hetero

and

Homogenoeus

Mixtures?

Complete

Activity

7
-
1C

Page

238

&

239

Post

A
ctivity

Discussion...

Enrichment

Colloids

Dispersions

Emu
l
sions