Transcript Activity 1: Just water?

Abduction
Activity 1: Just water?
A teaching sequence from the
Forensics unit of upd8 wikid
Year 7 Upgrade
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7E Learning Cycle
Dizzie has
disappeared. Billie
and Dragon begin
collecting evidence to
find her
The cola bottle
doesn’t contain
cola, so is the
colourless liquid
water?
What other colourless
liquids do the
students know?
Students evaluate
theories as to why the
bottle was in Dizzie’s
room.
Students use
universal indicator
and litmus to test the
contents of the
bottle
Students use
universal indicator to
test various
colourless liquids
Substances are
acidic, alkaline or
neutral. We can test
this using indicators
2
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Objectives:
• Use universal indicator
colours to classify solutions
as acidic, alkaline or neutral.
• Use pH values to classify
substances as acidic,
alkaline or neutral.
3
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Activity 1: Just water?
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Engage
Elicit
Explore
Explain
Elaborate
Extend
Evaluate
Hey Billie,
look at this. It’s a
MISPER report. Wow!
It’s Dizzie Anning.
At 5pm, her mum took
her a cup of tea. By 7,
she was gone.
Dizzie? My
best friend?
Kidnapped?
Help!
There’s
a map. Look…
The arrows show
points of
entry.
4
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Activity 1: Just water?
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Engage
Elicit
Explore
Explain
Elaborate
Extend
Evaluate
SS1
De’Ath Funeral services
Mr De’Ath
Mason’s yard
Coffins with silver
and goldundertaker
fittings
Silk linings
Tomb stones
Embalming services
Hearses
Cakes
Mrs
Pills
Mrs Pill’s
Pharmacy
Pharmacy
Toiletries
Medicines
Cosmetics
Mrs Beeton’s
Mrs
Cook
Shop
Beeton’s
cook
shop
Pots
and pans
Dishes and baskets
Cooking ingredients
Tableware
Alley
Hungry
Hungry
Hippo Café
Hippo
Hot and cold drinks
café
Snacks
Park and playground
Dizzie’s
house
Dizzie’s
bedroom
window
Mr Fixit DIY
Car park
Cleaning products
Mr
Fixit
DIY store
Tools
and hardware
Building supplies
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Activity 1: Just water?
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Engage
Elicit
Explore
Explain
Elaborate
Extend
Evaluate
Right.
The police know this
much. The café and
pharmacy were open, and
busy. The other shops
were closed. The police
wrote down everything
they sell.
And there’s an
alley behind Dizzie’s house.
It has a high fence. You can’t
see it from the road. It opens
into the park and at the
traffic lights.
Any
suspects?
6
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Activity 1: Just water?
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Engage
Elicit
Explore
Explain
Elaborate
Extend
Evaluate
Yes – 3.
Mr Fixit, Mrs Beeton
and Mr De’Ath. They all
hate Dizzie’s dad. I guess
that’s the motive.
OK you two.
Go join the crime scene
investigators at Dizzie’s house.
Draw the scene. Mark on it
everything you find. Bring back
samples of anything odd.
We must find that
abductor. And fast.
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Activity 1: Just water?
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Engage
Elicit
Explore
Explain
Elaborate
Extend
Evaluate
SS2
jewellery
box left open
bottle under
bed
specimen E on
bedside table
(little pieces)
carrier bag
under bed –
looks like
someone had a
rummage in it
specimen F
on floor (little
pieces)
specimen D
– fibres by
chair
specimen C
laptop on floor
– white
powder by
window
and end of
bed
specimen G – white
material caught on
window frame
turned
over chair
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ART
specimen A on and
under desk
specimen B – white
powder under and next
to fish tank stand
Activity 1: Just water?
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Engage
Elicit
Explore
Explain
Elaborate
Extend
Evaluate
Hey Billie –
look, found this in
Dizzie’s bin…
Any use?
Wow. That note could be really
useful. But we need all the samples,
too! You forgot the bottle from
under Dizzie’s bed. Can you go back
and get it, Dragon?
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Activity 1: Just water?
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Engage
Elicit
Explore
Explain
Elaborate
Extend
Evaluate
Let’s check out that
bottle. See what’s in it.
It’s obviously not
coke…
It’s just water! How can
that help us find Dizzie?
It’s not evidence, is it?
Don’t you
be so sure, Dragon. Not
all colourless liquids are
water.
Can you think of any?
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Engage
Elicit
Explore
Explain
Elaborate
Extend
Evaluate
Hmm. So Dr Sherl
reckons it could be an
acid or something.
They sell acids in the
Cook Shop…and the DIY
store. Could be useful
evidence.
Right.
So how can we
find out?
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Activity 1: Just water?
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Engage
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Here.
Take this. It’s
universal
indicator. Add it to
some acids and
alkalis. Is there
a pattern?
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Activity 1: Just water?
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SS3
Name of substance
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Colour with universal indicator
Activity 1: Just water?
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Engage
Elicit
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Now sort
the substances
into two groups
– acids and
alkalis.
Use the
chart to
decide which
are which.
Explain
Elaborate
Extend
Evaluate
Acid
Alkali
But what are
acids? What do
they do?
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Engage
Elicit
Explore
Explain
Elaborate
Extend
Evaluate
Acids are
sour. Can you
pick out the
acids from
here?
They can be
corrosive. That means
they burn your skin. But
vinegar isn’t corrosive,
because it’s mixed with
lots of water.
And alkalis?
What are they
like?
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Engage
Elicit
Explore
Explain
Elaborate
Extend
Evaluate
Alkalis are the
opposite of acids. They can
be corrosive, too. Sodium
hydroxide does more
damage to your eyes than
many acids.
But they’re
not all bad – even
toothpaste and
soap are slightly
alkaline.
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Activity 1: Just water?
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Explain
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But don’t we need more
accurate information for
our evidence?
Yes. Get your
test tubes from earlier.
Try matching them to this.
It’s the pH scale.
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Activity 1: Just water?
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Engage
Elicit
Explore
Explain
Elaborate
Extend
Evaluate
Hmmm.
So the more alkaline a substance
is, the higher its pH?
And the
more acidic a substance is,
the...
…lower its pH!
But some
substances aren’t
acidic or alkaline.
Where do we put
them?
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Activity 1: Just water?
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Engage
Elicit
Explore
Explain
Elaborate
Extend
Evaluate
They’re neutral.
Their pH is 7. Pure water is
neutral. So is salty water.
And some poisons.
Cool.
And in neutral
solutions, universal
indicator is…
…green!
Let’s get on with
looking at that
bottle.
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Engage
Elicit
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Explain
Elaborate
Extend
Evaluate
Well, its pH is pretty
low. Must be…
…hydrochloric
acid!
But how can you be so
sure? Maybe it’s
something else, like
sulfuric or nitric acid. At
least we know it’s not
vinegar.
So where’s it
from, then?
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Activity 1: Just water?
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Engage
Elicit
Explore
Explain
Elaborate
Extend
Evaluate
Good question.
You can think about that
in a minute. But first check
that it’s definitely an acid. Use
this other indicator – litmus.
Litmus goes red in acid and
blue in alkali.
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© Association for Science Education and Centre for Science Education 2010
Activity 1: Just water?
This page may have been changed from the original
Engage
Elicit
Explore
Explain
Elaborate
Extend
Evaluate
SS4
De’ath Funeral Services
Ms Pill’s Pharmacy
Coffins with gold and silver
fittings
Ropes to lower
coffins into
graves
Toiletries
Silk linings
Cosmetics
Medicines
Tombstones
Pots and
pans
Embalming services
Hungry Hippo Café
Mr Fixit DIY
Cleaning products
Hot and
cold drinks
Snacks
Cakes
Mrs Beeton’s Cook Shop
Tools and
hardware
Dishes and
baskets
Cooking
ingredients
Building
supplies
Ropes
22
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Activity 1: Just water?
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Engage
Elicit
Explore
Explain
Elaborate
Extend
Evaluate
SS5
The kidnapper dropped the bottle.
Who would have it,
and why?
The bottle is Dizzie’s.
She collected it when
she and her dad were
investigating a scam at
a local business.
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The bottle is Dizzie’s.
She took some household
substances to school for
an experiment, but
forgot one.
The bottle is not Dizzie’s
and not the kidnapper’s.
Why else
would it be in
her room?
Activity 1: Just water?
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Engage
Elicit
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Explain
Elaborate
Extend
Evaluate
OK. Now, prepare
a presentation for the
detectives. They need evidence
that it’s not just water in the
bottle. Tell them where you
think the bottle came from, and
why. Use evidence to support
your opinion.
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© Association for Science Education and Centre for Science Education 2010
Activity 1: Just water?
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Picture credits
Picture
Slide
Credit
Activity from the Forensics unit © Association for Science Education and Centre for Science Education 2010.
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© Association for Science Education and Centre for Science Education 2010
This page may have been changed from the original