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netineya [11]
3 years ago
13

Students are conducting an experiment to determine if sugars are present in foods. They heat a test tube containing a sugar solu

tion in a beaker of water. Which of these is an UNSAFE laboratory practice in this experiment?
a. heating the sugar solution in a closed test tube
b. rinsing hands with water after handling the materials
c. using a test tube clamp to hold the test tube
d. wearing safety goggles while heating the sugar solution
Chemistry
1 answer:
satela [25.4K]3 years ago
5 0

Answer:

A

Explanation:

Benedict's test is the ideal standard test to distinguished between reducing(glucose) and Non reducing(diasaccharides,sucrose).

Benedict's tests gives a positive test for the presence of reducing sugar,with the initial mixture of the sugar solution changing from  the initials green and orange  color   and brick red precipate of copper (ii) ,which would not dissolve in solution.

However, with non reducing the Benedict's gives a negative test.Because no color change occurs.

In either case,the chemical reaction that occurs as the solution gained heat  is exothermic and this may lead to boiling of the solution and spilling onto the burner,which may lead to explosion.

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Answer:

d ≈ 0.098 g/mL

Explanation:

The density of a substance can be found by dividing the mass by the volume.

d=m/v

The mass of the substance is 0.221 grams and the volume is 2.25 milliliters.

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Substitute the values into the formula.

d= 0.221 g / 2.25 mL

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Let’s round to the nearest thousandth. The 2 in the ten thousandths tells us to keep the 8 in the thousandth place.

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