Forensic Science Investigation/Lesson - Revision history

Caroline.jestaz: /* Chromatography to study the ink in the pen */

2012-10-04T14:40:37Z

Chromatography to study the ink in the pen

← Older revision		Revision as of 14:40, 4 October 2012
Line 58:		Line 58:
	3. Watch the water rise up the paper carrying the dye particles with it.<br />		3. Watch the water rise up the paper carrying the dye particles with it.<br />
	4. Be patient and let the water run almost to the top of the paper.<br />		4. Be patient and let the water run almost to the top of the paper.<br />
	5. You will be able to see the different colours of ink along the strip of paper.~~<br />~~		5. You will be able to see the different colours of ink along the strip of paper.


	== Clues from the pen ==		== Clues from the pen ==

Caroline.jestaz at 14:40, 4 October 2012

2012-10-04T14:40:12Z

← Older revision		Revision as of 14:40, 4 October 2012
Line 41:		Line 41:
	3. Dip a small piece of yellow indicator paper into the muddy water and allow the water to soak up the paper. <br />		3. Dip a small piece of yellow indicator paper into the muddy water and allow the water to soak up the paper. <br />

	4. Match the colour with ~~the~~ chart.<br />		4. Match the colour with a colour chart.<br />

	Acids turn the paper red, alkalis turn the paper dark blue, neutral soils turn the paper green.<br />		Acids turn the paper red, alkalis turn the paper dark blue, neutral soils turn the paper green.<br />
Line 47:		Line 47:
	== Soil Washing Clues ==		== Soil Washing Clues ==

	Samples of soil were collected from a suspect’s shoes and from the footprint outside the broken window. Test these samples and stick your indicator paper ~~below.~~		Samples of soil were collected from a suspect’s shoes and from the footprint outside the broken window. Test these samples and stick your indicator paper on a sheet of divided into three columns (Suspect A, Suspect B and Suspect C). Then write down what you think these clues tell you.

	Suspect A Suspect B Suspect C



	~~Write~~ down what you think these clues tell you.


	== Chromatography to study the ink in the pen ==		== Chromatography to study the ink in the pen ==
Line 70:		Line 63:
	== Clues from the pen ==		== Clues from the pen ==

	You have samples of ink from the pen found at the scene of the crime and ink from cartridges found in the pocket of the two suspects. Test them and see if you can link the suspect to the crime. Stick your strips of paper, called chromatograms, ~~below:~~		You have samples of ink from the pen found at the scene of the crime and ink from cartridges found in the pocket of the two suspects. Test them and see if you can link the suspect to the crime. Stick your strips of paper, called chromatograms on a sheet of paper divided into three columns (Suspect A, Suspect B and Crime Scene). Write down what you think these clues tell you. Can you advise the police on who the murderer might be? Look at the evidence you have collected. Summarise your ideas.

	~~Suspect A Suspect B Crime Scene~~		== Acids and Alkalis are in your home==



	~~Write down what you think these clues tell you. Can you advise the police on who the murderer might be? Look at the evidence you have collected. Summarise your ideas.~~


	~~'''Extra:'''~~

	Acids and Alkalis are in your home.

	Acids turn indicator red. Alkalis are the opposite of acids and turn indicators blue. Find out which kitchen chemicals are acids and which are alkalis. This is what you need to do:<br />		Acids turn indicator red. Alkalis are the opposite of acids and turn indicators blue. Find out which kitchen chemicals are acids and which are alkalis. This is what you need to do:<br />
Line 87:		Line 71:
	1. First add one drop of green indicator to each well of a white tile.<br />		1. First add one drop of green indicator to each well of a white tile.<br />
	2. Now add one drop of each test liquid to the correct well. For example, add liquid number one to well number one. Always use a clean pipette for each new liquid.<br />		2. Now add one drop of each test liquid to the correct well. For example, add liquid number one to well number one. Always use a clean pipette for each new liquid.<br />
	3. Write down what colour the indicator turns when the liquid is added in ~~the~~ table ~~below~~.~~<br />~~		3. Write down what colour the indicator turns when the liquid is added in a table.<br />

	~~Number Liquid Colour Acid or alkali?<br />~~
	~~1 Lemon juice<br />~~
	~~2 Tap water<br />~~
	~~3 Vinegar<br />~~
	~~4 Washing powder<br />~~
	~~5 Baking soda~~<br />

	My mum uses vinegar on both wasp stings and bee stings. Is she right?		My mum uses vinegar on both wasp stings and bee stings. Is she right?
	Test the bee stings and wasp stings and suggest what she could use from the kitchen for each sting.		Test the bee stings and wasp stings and suggest what she could use from the kitchen for each sting.

Caroline.jestaz at 14:32, 4 October 2012

2012-10-04T14:32:37Z

← Older revision		Revision as of 14:32, 4 October 2012
Line 29:		Line 29:
	Here are fingerprints from two suspects. Look carefully at them and label the patterns using the clue sheet as a guide.		Here are fingerprints from two suspects. Look carefully at them and label the patterns using the clue sheet as a guide.

	~~Here are the fingerprints collected from the scene of the crime:~~		[[Image:Fingerprints2_SC004.png\|Fingerprints2_SC004.png\|900x700px]]

	[[Image:Fingerprints2_SC004.png\|Fingerprints2_SC004.png\|~~800x600px~~]]

	== Clue Sheet ==		== Clue Sheet ==

Caroline.jestaz at 14:31, 4 October 2012

2012-10-04T14:31:28Z

← Older revision		Revision as of 14:31, 4 October 2012
Line 31:		Line 31:
	Here are the fingerprints collected from the scene of the crime:		Here are the fingerprints collected from the scene of the crime:

			[[Image:Fingerprints2_SC004.png\|Fingerprints2_SC004.png\|800x600px]]

	== Clue Sheet ==		== Clue Sheet ==

Caroline.jestaz: /* Clue Sheet */

2012-10-04T14:26:58Z

Clue Sheet

← Older revision		Revision as of 14:26, 4 October 2012
Line 44:		Line 44:
	4. Match the colour with the chart.<br />		4. Match the colour with the chart.<br />

	Acids turn the paper red, alkalis turn the paper dark blue, neutral soils turn the paper green.		Acids turn the paper red, alkalis turn the paper dark blue, neutral soils turn the paper green.<br />

	== Soil Washing Clues ==		== Soil Washing Clues ==

Caroline.jestaz: /* Clue Sheet */

2012-10-04T14:26:27Z

Clue Sheet

← Older revision		Revision as of 14:26, 4 October 2012
Line 44:		Line 44:
	4. Match the colour with the chart.<br />		4. Match the colour with the chart.<br />


	Acids turn the paper red, alkalis turn the paper dark blue, neutral soils turn the paper green.		Acids turn the paper red, alkalis turn the paper dark blue, neutral soils turn the paper green.

	== Soil Washing Clues ==		== Soil Washing Clues ==

Caroline.jestaz at 14:24, 4 October 2012

2012-10-04T14:24:41Z

← Older revision		Revision as of 14:24, 4 October 2012
Line 1:		Line 1:
	''This resource comes from a large collection of paper-based PGCE Science teaching materials at FoE''		''This resource comes from a large collection of paper-based PGCE Science teaching materials at FoE''

			== Introduction ==

			This series of activities has been used both as lesson material and as a circus of activity. It might have been used for example for a school open day and had students wear safety specs and laboratory coats.
			The teacher has brought together some common school lab activities and given them an investigative slant in a ‘real world’ context. <br />

			* A context to introduce the science topic ’acids and bases’ to lower secondary school students by measuring the pH of soil found on a crime suspect’s shoe.
			* A context to introduce the technique of chromatography, by comparing the ink from a pen at the crime scene, with ink owned by a suspect. This activity is often used in work to distinguish between mixtures and compounds
			* A context, to introduce human variation by comparing suspect’s thumb prints with that found at the crime scene. Fingerprinting is sometimes used as a starter activity to naturally lead to discussing what we inherit from our parents.
			* Unless we’ve missed a trick, a final activity appears to have no connection to the story. In this activity, pupils measure the acidity of household liquids. Again this activity is to introduce the topic ’acids and bases’.

			== Forensic Science Investigation ==

	It was a silent night, only interrupted by the sound of breaking glass and a scream erupting from the building. In the morning, the first evidence of the break-in is a broken window – but there’s a body, a pen next to it, and a footprint in the soil outside the window. A large thumbprint is found on a window handle. It is time to call the Forensic Science team!		It was a silent night, only interrupted by the sound of breaking glass and a scream erupting from the building. In the morning, the first evidence of the break-in is a broken window – but there’s a body, a pen next to it, and a footprint in the soil outside the window. A large thumbprint is found on a window handle. It is time to call the Forensic Science team!
Line 5:		Line 17:
	Name of the forensic scientist: ____________________________________________<br />		Name of the forensic scientist: ____________________________________________<br />

	Clue Sheet		== Clue Sheet ==
	No two people in the world have exactly the same fingerprints. Each fingerprint could have patterns such as:
			No two people in the world have exactly the same fingerprints. Each fingerprint could have patterns such as:<br />

	Look at your own fingerprints using the hand lens. Now use the evidence on the opposite page to help solve the crime.		Look at your own fingerprints using the hand lens. Now use the evidence on the opposite page to help solve the crime.

	[[Image:Fingerprints_SC004.png\|Fingerprints_SC004.png\|800x600px]]		[[Image:Fingerprints_SC004.png\|Fingerprints_SC004.png\|800x600px]]

	Fingerprint Clues		== Fingerprint Clues ==

	Here are fingerprints from two suspects. Look carefully at them and label the patterns using the clue sheet as a guide.		Here are fingerprints from two suspects. Look carefully at them and label the patterns using the clue sheet as a guide.
Line 18:		Line 32:


	Clue Sheet		== Clue Sheet ==

	Soils can be acid or alkalis. You can test this out by using an indicator.		Soils can be acid or alkalis. You can test this out by using an indicator.
Line 38:		Line 52:

	Suspect A Suspect B Suspect C		Suspect A Suspect B Suspect C

















Line 79:		Line 78:


			Write down what you think these clues tell you. Can you advise the police on who the murderer might be? Look at the evidence you have collected. Summarise your ideas.


			'''Extra:'''

			Acids and Alkalis are in your home.

			Acids turn indicator red. Alkalis are the opposite of acids and turn indicators blue. Find out which kitchen chemicals are acids and which are alkalis. This is what you need to do:<br />

			1. First add one drop of green indicator to each well of a white tile.<br />
			2. Now add one drop of each test liquid to the correct well. For example, add liquid number one to well number one. Always use a clean pipette for each new liquid.<br />
			3. Write down what colour the indicator turns when the liquid is added in the table below.<br />

			Number Liquid Colour Acid or alkali?<br />
			1 Lemon juice<br />
			2 Tap water<br />
			3 Vinegar<br />
			4 Washing powder<br />
			5 Baking soda<br />

	~~Write down what you think these clues tell you. Can you advise the police on who the murderer might be? Look at the evidence you have collected. Summarise your ideas.~~


	~~Extra:~~
	~~Acids and Alkalis are in your home~~
	~~Acids turn indicator red. Alkalis are the opposite of acids and turn indicators blue. Find out which kitchen chemicals are acids and which are alkalis. This is what you need to do:~~
	~~1. First add one drop of green indicator to each well of a white tile.~~
	~~2. Now add one drop of each test liquid to the correct well. For example, add liquid number one to well number one. Always use a clean pipette for each new liquid.~~
	~~3. Write down what colour the indicator turns when the liquid is added in the table below.~~

	Number Liquid Colour Acid or alkali?
	1 Lemon juice
	2 Tap water
	3 Vinegar
	4 Washing powder
	5 Baking soda

	My mum uses vinegar on both wasp stings and bee stings. Is she right?		My mum uses vinegar on both wasp stings and bee stings. Is she right?
	Test the bee stings and wasp stings and suggest what she could use from the kitchen for each sting.		Test the bee stings and wasp stings and suggest what she could use from the kitchen for each sting.

Caroline.jestaz at 14:20, 4 October 2012

2012-10-04T14:20:18Z

← Older revision		Revision as of 14:20, 4 October 2012
Line 9:		Line 9:
	Look at your own fingerprints using the hand lens. Now use the evidence on the opposite page to help solve the crime.		Look at your own fingerprints using the hand lens. Now use the evidence on the opposite page to help solve the crime.

	[[Image:Fingerprints_SC004.png\|Fingerprints_SC004.png\|~~400x300px~~]]		[[Image:Fingerprints_SC004.png\|Fingerprints_SC004.png\|800x600px]]

	Fingerprint Clues		Fingerprint Clues

Caroline.jestaz at 14:19, 4 October 2012

2012-10-04T14:19:43Z

← Older revision		Revision as of 14:19, 4 October 2012
Line 9:		Line 9:
	Look at your own fingerprints using the hand lens. Now use the evidence on the opposite page to help solve the crime.		Look at your own fingerprints using the hand lens. Now use the evidence on the opposite page to help solve the crime.

	[[Image:Fingerprints_SC004.png\|Fingerprints_SC004.png 400x300px]]		[[Image:Fingerprints_SC004.png\|Fingerprints_SC004.png\|400x300px]]

	Fingerprint Clues		Fingerprint Clues

Caroline.jestaz at 14:19, 4 October 2012

2012-10-04T14:19:13Z

← Older revision		Revision as of 14:19, 4 October 2012
Line 9:		Line 9:
	Look at your own fingerprints using the hand lens. Now use the evidence on the opposite page to help solve the crime.		Look at your own fingerprints using the hand lens. Now use the evidence on the opposite page to help solve the crime.

	[[Image:Fingerprints_SC004.~~png400x300~~\|Fingerprints_SC004.png ~~400x300~~]]		[[Image:Fingerprints_SC004.png\|Fingerprints_SC004.png 400x300px]]

	Fingerprint Clues		Fingerprint Clues