Transcript Resources: free Upd8 store activity - Fake Drunk

Drunk?
Fake! sequence
© Association for Science Education and Centre for Science Education 2010
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7E Learning Cycle
Was the guard drunk
on duty? Did his
orange juice contain
alcohol?
Students give initial ideas
Students write a report
on what they have
found out
Students use the web
page to work out a way
of separating the
alcohol from the juice
Students watch the
distillation of the
guard’s juice
Students learn
about how
distillation works
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Objectives:
• Use distillation to separate a
mixture of liquids.
• Describe what happens to
particles in distillation.
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Activity 5: Drunk?
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Engage
Elicit
Explore
Explain
Elaborate
Extend
Evaluate
We need to think about pure
liquids and mixtures for the next
part of the case.
Do these particle diagrams
show pure substances or
mixtures?
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Activity 5: Drunk?
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Engage
Elicit
Explore
Explain
Elaborate
The crime scene
investigators found half a
glass of orange juice on the
guard’s desk.
Extend
Evaluate
So what?
The gallery owner didn’t believe
our drugging story. He thinks that the
guard had alcohol in his juice and he fell
asleep drunk. He didn't do his job and
stop the burglary. The owner wants to
sue him!
We’d better check if the juice has
alcohol in it. But how?
Do alcohol and juice have different
physical properties?
Let’s do an Internet search.
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Activity 5: Drunk?
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Engage
Elicit
Explore
Explain
ScienceAnswers.com
Elaborate
Extend
Evaluate
Everything you need to know about science
What does it mean when we say that something is pure?
A pure substance is something that contains only one type of particle. The opposite of pure is a
mixture. Pure substances have the same properties.
Examples:
Pure water contains only water particles. It always has a melting point of 0 °C and a boiling point of
100 °C.
Pure ethanol (alcohol) contains only ethanol particles. It boils at 78 °C, it is highly flammable and it is
soluble in water.
Pure salt (sodium chloride) contains only sodium chloride particles. It has a melting point of 801 °C
and a boiling point of 1465 °C. It is soluble in water.
If we mix substances together we make mixtures.
Examples:
Sea water is a mixture of water, salt and other things (like fish!). Because the water has a boiling point
much lower than salt, we can get salt from seawater by evaporation.
Even though we sometimes call fruit juice pure, it is in fact a mixture of mainly water with other
substances.
Alcoholic drinks are a mixture of ethanol and water. To make them stronger, the alcohol can be
distilled.
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Activity 5: Drunk?
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Engage
Elicit
Explore
Explain
Elaborate
Extend
Evaluate
I can show you a simple way
of getting pure water from a
mixture.
mixture of
ink and
water
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© Association for Science Education and Centre for Science Education 2010
Did you predict any problems
with using this distillation
technique for the guard’s
juice?
Activity 5: Drunk?
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Engage
Elicit
Explore
Explain
Elaborate
Extend
Evaluate
SS1/2
leaving the
flask
mixture in
the flask
top of the
condenser
bottom of the
condenser
What state are the
the particles in at each
stage?
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Activity 5: Drunk?
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Engage
Elicit
Explore
Explain
Elaborate
Extend
Evaluate
So, the technique of
distillation will separate out
alcohol and water. What
shall we do next?
Try it out on
the guard’s
juice!
OK! But how will
we know if there’s alcohol
in the juice?
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Engage
Elicit
Explore
Explain
Elaborate
Extend
Evaluate
The guard’s juice has
no alcohol in it.
Well, that’s good
evidence that the gallery
owner’s theory is wrong.
Prepare a statement that includes:
• what we did
• how the technique works
• what would happen to juice with alcohol in it
• what we saw when we did the test.
Make sure your science is spot on, Billie.
I've got a feeling the owner is going
to be hard to convince!
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Activity 5: Drunk?
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Engage
Elicit
Explore
Explain
Elaborate
Extend
Evaluate
Brilliant, Billie.
We have used science to prove
that the guard is innocent. There is
no way that the gallery owner can
sue him for not doing his job
properly now!
So our evidence proves beyond all
reasonable doubt that it was not the
guard’s fault that he couldn’t stop the
burglar? Are you sure, Dragon?
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Activity 5: Drunk?
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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