Chemical Tests for Nutrients | Baamboozle - Baamboozle

If you really want to know if this Sudan III test of this mystery solution is postive, what should you do?

Compare it to a control in which Sudan III has been added to water but NOT added to the mystery solution.

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A mystery solution was tested using iodine. The mystery solution turned black while the control remained iodine-colored. What is this solution?

A complex carbohydrate, or polysaccharide, such as a starch or cellulose.

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In the experiment in this picture, which controlled variable was not controlled very well?

The amount of liquid that was dispensed into the test tubes.

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A biochemist wants to test five different mystery solutions for nutrients. In her experiment, what would be the controlled variables?

Each test tube would be the same size. Every test tube would get the same amount of liquid. Every test tube is exposed to the same temperature and reagent.

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A Bennedict's test was performed. Is it possible that positive test reveals that the solution contains sucrose?

Nope. Sucrose is a disaccharide. A Bennedict's test can tell you if a monosaccharide (reducing sugar) is in the solution.

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A biochemist is testing five different mystery solutions for protein. He designates one test tube for a control. What is his independent variable?

The mystery solutions since they will be the only variable that is different during the test.

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What does a positve Sudan III test tell you about a mystery solution?

That it contains lipids (fats).

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Starch and Celluose are both ______________.

Polysaccharides that turn black with an iodine test.

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In an iodine test, what is the experiemental control?

A test tube with just iodine added and no mystery chemical. You will need this to compare the colors to determine if there was a postive reaction.

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Go to last place!

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A biochemist is testing five different mystery solutions for protein. He designates one test tube for a control. What is his dependent varaible?

What kind of reaction (or color change) happens after the chemical testing is complete.

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When Biuret solution is added to a mystery solution the chemical reaction produced a dark purple color. What does this tell you?

The mystery solution contains protein.

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Which Bennedict's test is positive?

The test tube on the left that turned orange.

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A biochemist is performing a Biuret test on a mystery solution. Which test tube would be the experimental control? Why is this needed.

The experimental control has just Biuret solution (and water) with no mystery solution added. This allows for comparison.

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