fake activity 1 crime
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Activity 1: What was the crime?
Objectives:
• Recall how the particles are arranged in solids, liquids and gases.
• Use particles to explain a process.
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Hello, and welcome to your forensic science work placement. I’m Dr Sherl, your mentor. You must be Billie,
right?Yes, that’s me. I can’t wait
to get started! I’ve seen lots of forensics on TV,
but this is the real thing…
I’ve paired you up with Dragon, our other
trainee. Do you know what forensic scientists do?
Activity 1: What was the crime?4
Engage Elicit Explore Explain Elaborate Extend Evaluate
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Absolutely right Billie! I hope you’re ready to start, because I’ve just received news of a major
crime.
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A crime always leaves traces. Don’t forensic scientists use special techniques and try to
find evidence to pin the suspect to the crime scene?
Engage Elicit Explore Explain Elaborate Extend Evaluate
Activity 1: What was the crime?
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Engage Elicit Explore Explain Elaborate Extend Evaluate
It happened at an art gallery and it reminds me of a film. Watch this clip
– it might give you some ideas.
Activity 1: What was the crime?
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Engage Elicit Explore Explain Elaborate Extend Evaluate
Activity 1: What was the crime?
Police are reporting a strange break-in at a local art gallery. A rare and priceless painting seems to have been the target but the criminals may have escaped empty-handed; reports say the painting is still hanging in the gallery.A local police officer has told us that the case is being investigated by forensic scientists who are looking for clues to investigate.
It happened at an art gallery… the newspapers are starting to report the story.
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There’s not much evidence so far – just a statement from the duty guard. You might find
the crime scene drawing useful, too.
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Engage Elicit Explore Explain Elaborate Extend Evaluate
One of the rooms with a priceless 17th-century painting
looks like it’s beenbroken into.
Here, take a look.
Activity 1: What was the crime?
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Engage Elicit Explore Explain Elaborate Extend Evaluate
Activity 1: What was the crime?
SS1
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Engage Elicit Explore Explain Elaborate Extend Evaluate
Activity 1: What was the crime?
SS2
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So Billie, how can we find
out what happened?
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Engage Elicit Explore Explain Elaborate Extend Evaluate
Activity 1: What was the crime?
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Activity 1: What was the crime?12
Engage Elicit Explore Explain Elaborate Extend Evaluate
Yes – but it might have been tampered with. Maybe we
should check if it has been touched.
How can we do this?
We have to figure out what the crime was.It must be something to
do with the painting – but it looks fine!
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Activity 1: What was the crime?13
Engage Elicit Explore Explain Elaborate Extend Evaluate
Just look for fingerprints, Billie.
It’s easy – his fingerprints will be
all over the frame!
OK. But how can we find them?
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Activity 1: What was the crime?14
Engage Elicit Explore Explain Elaborate Extend Evaluate
Whenever you touch a surface, you leave
traces of oil from the ridges on your fingertips. These hidden
fingerprints show up if you brush charcoal dust onto the prints.
The charcoal sticks to the oil.
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Engage Elicit Explore Explain Elaborate Extend Evaluate
I tried this out and the fingerprints got all smudged. We can’t use
fingerprints like these as evidence to help solve a crime.
OK Billie. Can you find a better way of showing up
fingerprints?
I’ll give you three
substances to investigate.
You need a substance that:is colouredsticks to oil does not need
brushing onto the prints (to avoid smearing).
Activity 1: What was the crime?
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Engage Elicit Explore Explain Elaborate Extend Evaluate
Dr Sherl has lent me her book. It shows us how to use iodine to show up hidden
fingerprints on the frame.
This technique looks great – I’ll try it.
Activity 1: What was the crime?16This page may have been changed from the original
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Activity 1: What was the crime? 17
Engage Elicit Explore Explain Elaborate Extend Evaluate
Particles? What are they? And why do
they matter to forensic scientists?
Hmm. How does iodine show up the fingerprints? I think maybe iodine moves to the fingerprint, but
how? It doesn’t look like it’s moved…and the lump of iodine doesn't get any smaller. Better ask Dr
Sherl…
OK Billie,I’ll give you a clue.
It’s all to do with particles.
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Activity 1: What was the crime?18
Engage Elicit Explore Explain Elaborate Extend Evaluate
If you take a solid and cut it
in half again and again, you will eventually get a bit that is just too small
to cut up.
What would this piece look like if we could zoom in on it?
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Activity 1: What was the crime?19
Engage Elicit Explore Explain Elaborate Extend Evaluate
Substances can exist in three forms: solid, liquid and gas. These are the states of matter. In each state, the
particles are arranged differently,
and move differently.
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Activity 1: What was the crime?20
Engage Elicit Explore Explain Elaborate Extend Evaluate
If we transfer energy to or from the substance, its state changes.
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Activity 1: What was the crime?21
Engage Elicit Explore Explain Elaborate Extend Evaluate
When iodine warms up, it doesn’t melt like most solids. It turns into a gas. This change is sublimation.
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Activity 1: What was the crime?22
Engage Elicit Explore Explain Elaborate Extend Evaluate
I tried the iodine out and it worked! It showed
up a couple of thumbprints on the front, and lots of fingerprints on the back.
So we’ve gotour man…
Unknown prints
Gallery owner’s prints
Well, we’ve got some more
evidence, but we still can’t be sure what happened …
or who did it.
And Dr Sherl keeps going on about
how particles are so important to
forensic scientists…What does she mean?
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Activity 1: What was the crime?23
Engage Elicit Explore Explain Elaborate Extend Evaluate
Have a think about it, Billie. Without particles,
you and Dragon would never have found the fingerprints.
Explain why.
Now can you explain why particles are so important to forensic
scientists?
SS3
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Picture Slide Credit
Picture credits
Activity from the Forensics unit © Association for Science Education and Centre for Science Education 2010.Teachers and others who download this material may use it freely within their institution.
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