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guajiro [1.7K]
3 years ago
11

Which of these is a pure substance

Chemistry
1 answer:
Galina-37 [17]3 years ago
4 0

Both A and B are the answer.


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In the following reaction, eight moles of sodium hydroxide is broken down into four moles of sodium oxide and four moles of wate
maxonik [38]

Answer:

21.344%

Explanation:

For the given chemical reaction, 8 moles of the reactant should produce 4 moles of Na_{2}O. However, 195 g of Na_{2}O was produced instead. The molar mass of Na_{2}O is 61.9789 g/mol.

Thus, the moles of Na_{2}O produced = 195/61.9789 = 3.1462 moles

The percent error = [(Actual -Experiment)/Actual]*100%

The percent error =  [(4.00 - 3.1462)/4.00]*100% = (0.85376/4.00)*100% = 21.344%

8 0
3 years ago
Why melting and boiling points can be used as a way to check purity?​
jekas [21]

Answer: Let's see why

Pure solid and liquid compounds possess sharp melting and boiling points. Therefore, melting and boiling points of a compound can be used as a criteria of purity. ... Sometimes during cooling minute quantity of the substance (solid which is being purified) is added to the solution to facilitate the initial crystallisation.

Explanation:

6 0
2 years ago
Who arranged the elements according to atomic mass, and used the arrangement to predict the properties of missing elements.
Karolina [17]

Answer:

i think it's C

Explanation:

But if it's wrong,im so sorry

6 0
2 years ago
Read 2 more answers
WILL GIVE BRAINLIEST Which effect is one likely result of a forest fire? a. extinction b. adaptation c. speciation d. forced mig
MAVERICK [17]

Answer:

d. forced migration

Explanation:

Certain hazardous occurrences affect living organisms in their natural habitat. One of those occurrences is forest fire. Forest fire or vegetation fire is an uncontrollable break out of fire in a vegetation, affecting the inhabitants of the area.

The occurrence of a forest fire will lead to a forced migration of organisms from their natural habitat. Animals and other mobile organisms will be forced to leave behind their devastating habitat and migrate to a less threatened area in order to survive.

4 0
3 years ago
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Which is the most likely to be reduced
ollegr [7]

Answer:

B

Explanation:

4 0
3 years ago
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