CSI

Go down to see work please :


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Learning Intentions:

 1. To become familiar with //chromatography// and be able to apply it to 'real life'  situations.

 2. To perform 'fair tests' in Science identifying substances and fibres.

 3. Identify and group fingerprintsinto 3 main categories: Arch, Loop  and Whorl.

 4. Set up and carry out Scientific Experiments following the correct process  of; Aim, Equipment, Hypothesis, Method, Results and Conclusion.

 5. Work collaboratively with peers to solve problems using the skills learnt.

Lesson One - Paper Chromatography

Chromatography is a technique used for seperating mixtures. In all of the variations of Chromatography, a substance is placed onto or into a medium and then a solvent passes through the test substance, some of the test substance may be attracted to the solven and follow it up in the medium. Different types of molecules are transported different distances, causing them to seperate. In these activities, filter paper is the medium, solvent is the solvent and black ink is the test substance. Chromatography is used in crime labs to seperate the components of 'clue' substances such as blood, ink or other mixtures found at the scene of a crime. Chromatograms of these clue substances are then compared with those of the suspected sources.

__Chromatography Monday 9th May 2011__

 __L.I__ I am learning the process of the chromatography and use this  to assist with solving the crime.

 __Aim:__ To use chromatography to distinguish which pen was used in the ransom note.

<span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> __Hypothesis:__ I think that it will be the Black Marker that write the note because the tip of the pen looked like it was about the same size as the writing on the note.

<span style="font-family: Chalkboard; font-size-adjust: none; font-size: 18px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;">Black marker x5 <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 18px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> Casade marker x14 <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 18px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> Sharpie x3 <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 18px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> Vivid x4

<span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;">__Equipment -__ Beaker, felt pens, ransom note, filter paper, water, hand lens, masking tape and straws.

<span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> Method:

<span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> 1. Gather samples of pens. <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> 2. Draw a line across a strip of filter paper, 1-4cm from the bottom. <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> 3. Attach to straw with masking tape. <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> 4. Put filter paper in beaker, making sure the ink is at least 1-2cm above <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> the water. <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> 5. Observe. <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> 6. Remove filter when water has travelled about 3/4 of the way up the strip. <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> 7. Compare results with the ransom note results.

<span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> Results - <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> 1. Black Ballpoint Pen <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> 2. Vivid <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> 3. Cascade marker <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> 4. Sharpie <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> 5. Black marker

<span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> Reflection - (write here what you have learnt during this lesson).

__Lesson Three - Kitchen Chaos Wednesday 11 May 2011:__

<span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> The kitchen cupboard has got very damp and the labels have fallen off some <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> of the containers. From the label scraps it is found that there is:

<span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> Icing sugar <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> baking soda <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> salt <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> cream of tartar <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> cornflour

<span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> TASK - Make order out of chaos

<span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> Use a series of simple tests and good observations to find out what substance is in <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> each container.

<span style="color: #009f00; font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;">Caution: You are not allowed to taste them! Please use small quantities.

<span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;">__Lesson 5 - Hair Analysis Friday 20 May 2011:__

<span style="font-family: Arial; font-size-adjust: none; font-size: 28px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;">Learning Intention: We are learning to

<span style="font-family: Arial; font-size-adjust: none; font-size: 28px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;">1. think about the process involved in developing a technique for forensic analysis

<span style="font-family: Arial; font-size-adjust: none; font-size: 28px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;">2. identify the physical structures of hair

<span style="font-family: Arial; font-size-adjust: none; font-size: 28px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;">3. use our observational skills, critical thinking and microscopy

<span style="font-family: Arial; font-size-adjust: none; font-size: 28px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;">Background information Unfortunately hair is not the best type of physical evidence for establishing identity. It is not possible to show with any certainty that two hairs came from the same person or animal. However hair can be used to rule out certain suspects or scenarios. It can also be used to corroborate (support) other physical evidence if it is consistent with the rest of the evidence.

<span style="font-family: Arial; font-size-adjust: none; font-size: 28px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;">Guide to Identification

<span style="font-family: Arial; font-size-adjust: none; font-size: 28px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;">Cuticle - Outer coating composed of overlapping scales <span style="font-family: Arial; font-size-adjust: none; font-size: 28px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px; min-height: 32px;"> <span style="font-family: Arial; font-size-adjust: none; font-size: 28px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;">Medulla - Central core, this may be absent <span style="font-family: Arial; font-size-adjust: none; font-size: 28px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px; min-height: 32px;"> <span style="font-family: Arial; font-size-adjust: none; font-size: 28px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;">Cortex - Protein rich structure surrounding the medulla; contains pigment <span style="font-family: Arial; font-size-adjust: none; font-size: 28px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px; min-height: 32px;">

<span style="font-family: Arial; font-size-adjust: none; font-size: 28px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px; min-height: 32px;">Fill in the Identification Chart