2 years ago

Which best describes the effect of jj Thomson discovery

1 answer:

7 0

JJ Thomson discovered electrons using the cathode ray. Electrons are negatively charged particles that orbit around the nucleus of an atom. Finding out that there was a negative charge to balance out the positive charge. This later helped develop Hund's Rule and the Pauli Exclusion Principle.

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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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Placing a powder into a beaker that contains liquid, resulting the beaker to get hotter.

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Which of the following list all the elements that are present in a molecule of potassium carbonate K2C03?

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H
Since K stands for potassium, C stands for Carbon and O stands for Oxygen

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