How much water should be added to 100 g of sugar so as to obtain mass percent of sugar solution? Pls answer it fast , i have asked this question before also but ppl didnt answer till now
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Answer:
Stanford University
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Argumentation in Science
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Mixing Sugar and Water
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Sugar-and-Water-download.docx
Two students pour sugar grains into a glass of hot water. They make three observations.
Once the sugar is poured into the water, it is stirred. After stirring, the sugar can no longer be seen.
Also after stirring, each student tastes the water. They both agree that the water tastes sweet.
The weight of the water + glass + sugar is the same as the weight of the glass containing the mixture after the sugar was stirred in.
Note: The numerical scores indicated in the scoring rubrics were for research purposes. Higher scores indicate higher quality argumentation. We encourage you to use a scoring scheme that matches your present goals for students.
AWhy can we no longer see the sugar?
We cannot see the sugar anymore because ….
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Pictures of the sugar and water particles
This is a picture of the sugar and water particles before they were mixed together:
Which of these pictures best represents the water and sugar particles after they have been thoroughly mixed together?
BWhich of these arrangements best represents the water and sugar particles after they have been thoroughly mixed together?
Arrangement: A, B, C, or D
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CWhy do you think the picture you chose is best?
…
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Two students discuss what they think happened to the sugar.
Laura says
I think the sugar is gone.
Mary says
I think the sugar is still there.
Laura and Mary made two additional observations of the sugar and water.
After stirring, each student tasted the water. They both agree that the water tasted sweet.
D1Whom does this evidence support?
Laura, Mary, both, or neither
The weight of the sugar, water, and glass before it was added to the water is the same as the weight of the mixture and the glass after it was stirred in.
D2Whom does this evidence support?
Laura, Mary, both, or neither
Laura and Mary’s teacher also tells them some information.
Matter cannot be created or destroyed.
D3Whom does this evidence support?
Laura, Mary, both, or neither
Sometimes a substance breaks into very small pieces when mixed with another substance.
D4Whom does this evidence support?
Laura, Mary, both, or neither
Note: Parts D2, D3, and D4 were not scored.
D1 and EWhom does this evidence support?
Laura, Mary, both, or neither
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At the end of the class, Mary makes the following argument:
Mary's argument
The sugar is still there. The total mass stays the same. If the sugar disappeared, the mass would have changed.
FWhat is the evidence in Mary's argument?
The evidence in Mary's argument is ….
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GWhich piece of evidence best supports your answer? Explain how this evidence supports your answer.
…
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You will be asked to explain why one of these pictures is not as the one you chose.
Evidence:
After stirring, each student tastes the water. They both agree that the water tastes sweet.
The weight of the water, glass, and the sugar is the same as the weight of the glass and the mixture after the sugar was stirred into the water.
Matter cannot be created or destroyed.
Sometimes a substance breaks into very small pieces when mixed with another substance.
HPick one of the pictures above. Why do you think it is not as good? Use the evidence above, your own knowledge of mixing sugar and water, or both.
Select A, B, C, or D is not as good because ….
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Now that you have seen some evidence and other students’ ideas, let’s return to the original question.
Two students pour sugar grains into a glass of hot water. Once the sugar is poured into the water, it is stirred. After stirring, the sugar can no longer be seen.
IWhy can we no longer see the sugar?
We can't see the sugar any more because ….
Show Answer Key
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Explanation:
The answer is Absolutely right