Investigation 1: Making Mixtures
Please read this article in preparation for Investigation 1: Making Mixtures
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Research the work of scientists studying the natural world. Secondary sources can be used.
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Describe and investigate some effects of human influences on the environment.
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Understand that elements are made of atoms.
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Explain the idea of compounds.
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Distinguish between elements, compounds and mixtures.
Follow-up Analysis Questions:
GROUP
1. Why do you think Procedure Steps 3 and 4 directed you to add the same amount of liquid and solid to Cups A and B?
2. Describe the major differences between the malachite-water mixture in Cup A and the pepper-water mixture in Cup B.
3. Try to explainthe reason(s) for any differences between the liquid part of the mixtures in Cup A and Cup B.
4. Describe any differences between the liquid in Cup C and the liquid in Cup D (See photo below). Try to explain the reason(s) for these differences.
5. If you could have collected all the solids that were left in Cup A after you stirred the mixture of water and malachite, do you think you would have the exact amount you started with? Explain why or why not.
6. If you could have collected all the soilds that were left in Cup B after you stirred the mixture of water and pepper, do you think you would have the exact amount you started with? Explain why or why not.
7. Descibe what filter paper
a. can remove from dirty water
b. cannot remove from dirty water
8. Do you think the liquid in Cup C is clean? Explain why or why not.
INDIVIDUAL:
9. Do you think that filtering the ACME wastewater would be a good way to clean it? Explain why or why not?
World War I Connections:
Dysentery is a disease involving the inflammation of the lining of the large intestines. The inflammation causes stomach pains and diarrhoea. Some cases involve vomiting and fever. The bacteria enters the body through the mouth in food or water, and also by human feaces and contact with infected people. The diarrhoea causes people suffering from dysentery to lose important salts and fluids from the body. This can be fatal if the body dehydrates. This disease struck the men in the trenches as there was no proper sanitation. Latrines in the trenches were pits four to five feet deep. When they were within one foot they were supposed to be filled in and the soldiers had the job of digging a new one. Sometimes there was not time for this and men used a nearby shell-hole.
Dysentery caused by contaminated water was especially a problem in the early stages of the war. The main reason for this was that it was some time before regular supplies of water to the trenches could be organised. Soldiers were supplied with water bottles, that could be refilled when they returned to reserve lines. However, the water-bottle supply was rarely enough for their needs and soldiers in the trenches often depended on impure water collected from shell-holes or other cavities. Later, to purify it, chloride of lime was added to the water. This was not popular with the soldiers as they disliked the taste of the purified water.
Results Part A:
Results Part B: