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irinina [24]
3 years ago
5

In 1860, Chemists could make which of the following statements about the known chemical elements?

Chemistry
1 answer:
LenKa [72]3 years ago
3 0

Answer:

b. Some had similar properties

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A student collected a 47.5 mL sample of gas in the lab at 0.8 atm pressure and 29.00C. What volume would this gas sample occupy
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the volume would be 69.034mL

Explanation:

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4. What are the potential sources of error that might cause disagreement between the activity series' prediction of reactions an
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3 years ago
A sample of 19 mg of 9-fluorenone is dissolved in 5 mL of diethyl ether. The resulting organic
maks197457 [2]

Answer:

15.70mg would remain

Explanation:

Partition coefficient is used to extract or purify a solute from a solvent selectively to avoid interference from other substances. For the problem, formula is:

Kp = Concentration 9-fluorenone in ether / Concentration of solute in H₂O

After the solute, 9-fluorenone, is extracted with water, the mass that remains in ether is:

(19mg - X)

<em>Where X is the mass that now is in the aqueous phase</em>

Replacing in Kp formula:

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0.95X = 19mg - X / 5mL

4.75X = 19 - X

5.75X = 19

X = 19 / 5.75

X = 3.30mg

That means 9-fluorenone that remain in the ether layer is:

19mg - 3.30mg =

<h3>15.70mg would remain</h3>
8 0
3 years ago
Which substance can not be broken down by a chemical change
tangare [24]
Well, an element is a substance that cannot be decomposed into a simpler substance by chemical change, so element is the answer you are probably looking for! Hope this helps!
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3 years ago
1. What is a gene?(1 point)
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Based on this website I would say B. Hope this helps

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