1. This page may have been changed from the original version 2.0 Fake! What was the crime? A teaching sequence from the Forensics unit of upd8 wikid Activity from the Forensics unit © upd8 wikid, built by cracking science

2. 2 7E Learning Cycle Students are shown how iodine can be used to show fingerprints. Was the painting tampered with? Students consider how latent fingerprints on the frame can be shown. Students try out using different substances to show up latent fingerprints. Students explain how particles were used to show up the fingerprints. Students learn about particles and changes of state.

3. Activity 1: What was the crime? 3 This page may have been changed from the original Activity from the Forensics unit © upd8 wikid, built by cracking science Engage Elicit Explore Explain Elaborate Extend Evaluate We have to figure out what the crime was. It must be something to do with the painting – but it looks fine!

4. Activity 1: What was the crime? 3 This page may have been changed from the original Activity from the Forensics unit © upd8 wikid, built by cracking science 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!

5. Activity 1: What was the crime? 4 Engage Elicit Explore Explain Elaborate Extend Evaluate This page may have been changed from the original Activity from the Forensics unit © upd8 wikid, built by cracking science Just look for fingerprints, Billie. It’s easy – his fingerprints will be all over the frame!

6. Activity 1: What was the crime? 4 Engage Elicit Explore Explain Elaborate Extend Evaluate This page may have been changed from the original Activity from the Forensics unit © upd8 wikid, built by cracking science Just look for fingerprints, Billie. It’s easy – his fingerprints will be all over the frame! OK. But how can we find them?

7. Activity 1: What was the crime? 5 Engage Elicit Explore Explain Elaborate Extend Evaluate This page may have been changed from the original Activity from the Forensics unit © upd8 wikid, built by cracking science 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.

8. 6 Engage Elicit Explore Explain Elaborate Extend Evaluate Activity from the Forensics unit © upd8 wikid, built by cracking science Activity 1: What was the crime? This page may have been changed from the original I tried this out and the fingerprints got all smudged. We can’t use fingerprints like these as evidence to help solve a crime.

9. 6 Engage Elicit Explore Explain Elaborate Extend Evaluate Activity from the Forensics unit © upd8 wikid, built by cracking science Activity 1: What was the crime? This page may have been changed from the original 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?

12. Activity 1: What was the crime? 7 Engage Elicit Explore Explain Elaborate Extend Evaluate This page may have been changed from the original Activity from the Forensics unit © upd8 wikid, built by cracking science Dr Sherl has lent me her book. It shows us how to use iodine to show up hidden fingerprints on the frame

13. Activity 1: What was the crime? 7 Engage Elicit Explore Explain Elaborate Extend Evaluate This page may have been changed from the original Activity from the Forensics unit © upd8 wikid, built by cracking science 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.

14. Activity 1: What was the crime? 8 Engage Elicit Explore Explain Elaborate Extend Evaluate This page may have been changed from the original Activity from the Forensics unit © upd8 wikid, built by cracking science Hmm. How does iodine show up the fingerprints? What's going on? 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…

15. Activity 1: What was the crime? 8 Engage Elicit Explore Explain Elaborate Extend Evaluate This page may have been changed from the original Activity from the Forensics unit © upd8 wikid, built by cracking science Hmm. How does iodine show up the fingerprints? What's going on? 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.

16. Activity 1: What was the crime? 8 Engage Elicit Explore Explain Elaborate Extend Evaluate This page may have been changed from the original Activity from the Forensics unit © upd8 wikid, built by cracking science Particles? What are they? And why do they matter to forensics scientists? Hmm. How does iodine show up the fingerprints? What's going on? 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.

17. Activity 1: What was the crime? 9 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? This page may have been changed from the original Activity from the Forensics unit © upd8 wikid, built by cracking science

18. Activity 1: What was the crime? 10 Engage Elicit Explore Explain Elaborate Extend Evaluate Substances can exist in 3 forms: solid, liquid and gas. These are the states of matter. In each state, the particles are arranged differently , and move differently . This page may have been changed from the original Activity from the Forensics unit © upd8 wikid, built by cracking science

19. Activity 1: What was the crime? 11 Engage Elicit Explore Explain Elaborate Extend Evaluate If we transfer energy to or from the substance, its state changes. This page may have been changed from the original Activity from the Forensics unit © upd8 wikid, built by cracking science

20. Activity 1: What was the crime? 12 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 . This page may have been changed from the original Activity from the Forensics unit © upd8 wikid, built by cracking science

21. Activity 1: What was the crime? 13 Engage Elicit Explore Explain Elaborate Extend Evaluate This page may have been changed from the original Activity from the Forensics unit © upd8 wikid, built by cracking science I tried it out using the iodine and it worked! The iodine showed up a couple of thumbprints on the front, and lots of fingerprints on the back. So we’ve got our man… Unknown prints Gallery owner’s prints

22. Activity 1: What was the crime? 13 Engage Elicit Explore Explain Elaborate Extend Evaluate This page may have been changed from the original Activity from the Forensics unit © upd8 wikid, built by cracking science I tried it out using the iodine and it worked! The iodine showed up a couple of thumbprints on the front, and lots of fingerprints on the back. So we’ve got our 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.

23. Activity 1: What was the crime? 13 Engage Elicit Explore Explain Elaborate Extend Evaluate This page may have been changed from the original Activity from the Forensics unit © upd8 wikid, built by cracking science I tried it out using the iodine and it worked! The iodine showed up a couple of thumbprints on the front, and lots of fingerprints on the back. So we’ve got our 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?

24. Activity 1: What was the crime? 14 Engage Elicit Explore Explain Elaborate Extend Evaluate This page may have been changed from the original Activity from the Forensics unit © upd8 wikid, built by cracking science Have a think about it, Billie. Without particles, you and Dragon would never have found the fingerprints. Explain why .

25. Activity 1: What was the crime? 14 Engage Elicit Explore Explain Elaborate Extend Evaluate This page may have been changed from the original Activity from the Forensics unit © upd8 wikid, built by cracking science 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?