Penny%For%Your%Thoughts% An%Introduction%to%Chemistry ...
Penny
For
Your
Thoughts
Name: _______________________
An
Introduction
to
Chemistry
Date: ________________________
Purpose:
To
observe
a
chemical
transformation
firsthand.
Period:_______________________
Your
instructor
will
guide
you
through
an
experimental
procedure.
Be
sure
to
pay
close
attention
to
your
instructor's
directions.
This
procedure
uses
dangerous
chemicals.
Do
not
proceed
to
the
next
step
until
instructed
to
do
so.
Goggles
are
required
for
this
lab.
You
are
also
required
to
tie
your
hair
back.
Before
we
begin,
please
answer
the
following
questions.
List
the
equipment
we
will
use
in
this
lab:
1. ___________________________________
5.
___________________________________
2. ___________________________________
6.
___________________________________
3. ___________________________________
7.
___________________________________
4. ___________________________________
8.
___________________________________
Safety
is
extremely
important
in
the
chemistry
lab.
In
the
space
below,
write
three
important
safety
considerations
for
this
experiment.
1
2
3
Procedure
Part
1
1. Using
weigh
paper,
mass
out
6.0
grams
of
zinc
filings
in
a
150
mL
beaker
to
cover
the
bottom.
(This
may
have
been
done
for
you.)
2. Carefully
add
15
mL
of
3M
sodium
hydroxide
(NaOH)
to
the
same
beaker.
3. Place
the
150
mL
beaker
on
a
hot
plate
which
has
been
set
to
"3".
If
the
liquid
begins
to
boil,
turn
down
the
setting
on
the
hot
plate
down
to
"2".
4. Use
your
tongs
to
pick
up
the
penny
and
place
it
in
the
beaker.
If
you
are
working
in
pairs,
put
both
pennies
in
and
let
it
sit
for
1--2
minutes.
5. While
the
penny
is
warming
up,
put
200
mL
of
tap
water
into
a
250
mL
beaker.
6. One
the
penny
is
coated,
remove
it
with
the
tongs.
Make
sure
your
teammate
uses
the
other
set
of
tongs
to
hold
the
hot
beaker
still
while
the
penny
is
removed.
7. Put
the
hot
penny
in
the
250
mL
beaker,
which
is
filled
with
tap
water.
This
serves
to
cool
and
rinse
the
penny.
8. Turn
the
hot
plate
off
Part
2
1. Set
up
and
light
the
Bunsen
burner
according
to
your
teacher's
directions.
2. Adjust
the
flame
on
the
burner
using
the
metal
collar.
A
blue
flame
is
hotter
than
a
yellow
or
orange
flame.
3. Use
your
tongs
to
place
the
"silvered"
penny
above
(not
into)
the
flame
of
the
Bunsen
burner.
(Too
much
heat
can
warp
and
destroy
your
penny!)
4. Hold
the
penny
in
the
flame
only
until
it
changes
color,
and
no
longer.
Pay
attention,
it
happens
quickly
(within
10
seconds)!
5. Once
the
penny
has
changed
color,
place
it
in
the
beaker
of
water
to
cool.
6. Turn
the
flame
off.
Part
3
1. Follow
your
instructor's
directions
regarding
the
beaker
of
sodium
hydroxide
and
zinc.
2. Do
a
general
clean
up
of
the
lab
area.
3. Wash
your
hands
with
soap.
During
the
lab
Procedure
Observation
Place
the
beaker
with
zinc
and
Zinc covers the bottom of the beaker. The sodium hydroxide is a
sodium
hydroxide
on
a
hot
plate
and
clear colorless liquid that fills the beaker about half way. During
set
the
hot
plate
to
4.
If
the
liquid
heating, there is a slightly putrid odor and bubbles form.
begins
to
boil,
turn
the
hot
plate
down
a
little.
Use
tongs
to
place
the
penny
in
the
heated
beaker.
After
a
few
minutes,
remove
the
penny
with
tongs.
Put
the
hot
penny
in
the
beaker
of
cold
water
to
cool
and
rinse
it.
Use
tongs
to
place
the
penny
into
the
flame
of
the
Bunsen
burner.
When
the
penny
has
changed
color,
place
it
in
the
beaker
of
cold
water
to
cool
again.
In
the
table
below,
briefly
describe
your
observations
of
each
chemical
used
in
the
experiment.
The
first
one
has
been
done
for
you.
Chemical
Observation
Penny
Shiny,
reddish--brown,
cylinder--shaped
solid
Zinc
3M
Sodium
hydroxide
Water
After
you
are
done
Working
with
the
students
at
your
table,
spend
a
few
minutes
discussing
descriptions
of
what
you
observed
during
the
experiment.
Then,
answer
the
questions
individually
on
binder
paper.
Write
each
question
on
your
paper.
Use
complete
sentences.
1. Describe
what
happened
to
the
penny
during
the
experiment.
2. What
do
you
think
turned
the
penny
silver?
3. What
do
you
think
happened
to
turn
the
penny
gold?
4. Do
you
think
you
made
real
gold?
Why
or
why
not?
How
could
you
find
out?
................
................
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