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Nuetrik [128]
3 years ago
12

When heating a chemical solution over an open flame in a test tube you should - A. keep a cork in the test tube so the solution

cannot spill out. B. put your safety goggles on once the solution gets really hot. C. use several paper towels to pick up the hot test tube when it is ready. D. make sure the test tube is not pointing towards you or your classmates.
Chemistry
1 answer:
Alla [95]3 years ago
3 0

Hello.

The answer is:  A. keep a cork in the test tube so the solution cannot spill out

B and C both could be very deadly and it shouldnt be D because if u have an open flame you shouldnt open it even if its not towards anyone.

have a nice day

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ICE Princess25 [194]

Answer : The percent by mass of the solution is 7.81 %

Explanation : Given,

Mass of NaCl = 8.75 g

Mass of solution = 112.0 g

Now we have to determine the percent by mass of the solution.

\text{Mass percent}=\frac{\text{Mass of NaCl}}{\text{Mass of solution}}\times 100

Putting values in above equation, we get:

\text{Mass percent}=\frac{8.75g}{112.0g}\times 100=7.81\%

Therefore, the percent by mass of the solution is 7.81 %

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Dana is trying to determine if an unknown sample is a pure substance or not. The sample has a cloudy white color, and it seems e
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Answer:

Dana filtered the sample and larger granules of the sample were left behind.

Explanation:

If a substance is pure, it will have a uniform composition throughout. It will not separate into particles of various sizes.

One of the characteristics of pure substances is that they are homogeneous. A mixture is definitely made up of particles of various sizes.

Since the particles was filtered and larger granules were left behind, the sample has been separated by a physical method (filtration). Only a mixture can be separated by physical methods. It is not a pure substance.

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A sample of ideal gas is in a sealed container. The pressure of the gas is 505torr, and the temperature is 43 degree celsius. If
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Each isotope of Oxygen has a different number of neutrons

<h3>Further explanation </h3>

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So Isotopes are elements that have the same Atomic Number (Proton)

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For O-17: number of neutrons = 17-8 = 9

For O-18: number of neutrons = 18-8 = 10

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