3 years ago

Chemical reactions that ____ energy will not occur without a source of energy

Chemistry

1 answer:

andrezito [222]3 years ago

4 0

Chemical reactions that release energy will not occur without a source of energy. So the answer is release.

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A sample of aspirin weighing 5.945 g became contaminated with 2.134 g of sodium sulfate. The resulting

ira [324]

Answer:

The correct answer to the following question will be "62.9 %".

Explanation:

The given values are:

The aspirin's initial amount = 5.945 g.

and is polluted containing 2,134 g of sodium sulfate.

After extraction we provided 3,739 g of pure aspirin.

Now,

$Percentage \ of \ recovery \ aspirin =\frac{Aspirin \ amount \ isolated \ after \ extraction}{initial \ amount \ of \ aspirin}\times 100$

On putting the values in the above formula, we get

⇒ $=\frac{3.739}{5.945}\times 100$

⇒ $=62.9 \ percent$

Note: percent = %

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3 years ago

Express in scientific notation. Make sure your answer has the same number of significant figures as the starting value.

frez [133]

The correct response is the second option.
6.1103x10^4. As this was the only answer that had the same number of significant figures as the starting value.

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3 years ago

Why is it difficult to determine earth's inner structure

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It is hard because we can't get past the crust, Our machines will burn up at the mantle and so will we. The layers go: crust, mantle, outer core, inner core.

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30 point. What is formed when a hydroxyl group is substituted for a hydrogen?

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Haloalkanes

Yeah it’s that

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