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3 years ago

PLEASE HELP ME I WILL LOVE U FOREVER

Chemistry

1 answer:

AlekseyPX3 years ago

7 0

Answer:

according to me option a is the correct one

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Calculate the moles of Cu in 7.4×1021 atoms of Cu.

IceJOKER [234]

1 moles -------- 6.02x10²³ atoms
?? moles ----- 7.4x10²¹ atoms

moles = 7.4x10²¹ / 6.02x10²³

= 0.01229 moles

hope this helps!

5 0

3 years ago

If you were in a completely dark room, the room would still be "shining" in this type of light:

Vsevolod [243]

C)infrared is the answer

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3 years ago

It is common to mix polar solvents (e.g., acetone) with non-polar solvents (e.g., hexane) to obtain an eluting solvent of interm

hammer [34]

Answer:

No, it is not appropriate to mix water and DMSO

Explanation:

We have to realize that DMSO is a highly polar solvent and water is a highly polar solvent. The question explicitly says that our target is to produce a solvent of intermediate polarity.

We can only do this by mixing a polar and a nonpolar solvent. We have been given the example of the mixture of acetone/hexane which is quite a perfect mixture.

Thus, it is inappropriate to mix DMSO and water.

6 0

3 years ago

Question 1 of 10 What happens when a solid becomes a liquid?

Natalija [7]

Answer:it dissolves and evaporates

Explanation:

6 0

3 years ago

Read 2 more answers

Fe(s) + O2 (g) → Fe3+ O2− What most likely happens during this reaction?

Musya8 [376]

Answer : The most likely happens during this reaction is, Oxidation-reduction

Explanation :

The balanced reaction will be,

$4Fe(s)+3O_2(g)\rightarrow 2Fe_2O_3(s)$

In this reaction, neutral iron loses 3 electrons and oxidizes in (+3) state, $Fe^{3+}$ and neutral oxygen gains 2 electrons and reduces in (-2) state, $O^{2-}$

When iron react with oxygen gas to give iron oxide. This process is known as iron rusting. During the reaction, oxidation-reduction process occurs.

Oxidation : It is a type of chemical reaction in which a substance loses its electrons. Or we can say that in oxidation, the oxidation number increases.

Reduction : It is a type of chemical reaction in which a substance gains its electrons. Or we can say that in reduction, the oxidation number decreases.

5 0

3 years ago