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Scientific Investigations of Matter
Q: What did you observe when the salt and water were combined?
A: Well, of course the salt dissolved overtime, but it did not dissolve immediately, only after stirring for a couple of minutes. At first, it would turn milky white, and then gradually get more translucent until it was just as clear as water by itself.
Q: How did the water and the salt change when they were combined in the cup?
A: The salt changed by dissolving and becoming invisible in the cup once it was mixed in well. The water changed by becoming a solution with salt instead of just water with nothing other than water in it.
Q: How did measurement help you describe the changes?
A: Measurement helped describe the changes to the water and salt because the solution and the plain water were different weights. When the salt was not added, the water weighed fifty grams. When it was made as solution by adding the salt, it weighed more than fifty grams. Then we could tell the water changed.
Q: What have you learned about the properties of salt when you add it to water?
A: By putting something in water, you can learn at least one new property of the material. With salt, we learned that it dissolves when you put it in the water, which means you can no longer see it. It also means that you cannot separate the two things by using a screen filter or a coffee filter.
Q: How does experimenting with a solution of salt and water help you to understand the properties of salt and/or water?
A: There are three things that you can do with something to find a new property. You can observe, (using your five senses) measure, and experiment. Using one of those things, you will be able to find a new property of the object you are investigating. Therefore, when we experimented with salt in water, we found that one property of salt is that it dissolves.
Article posted January 22, 2009 at 01:53 PM •
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