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strojnjashka [21]
2 years ago
11

Consider the entropy change in the following chemical or physical processes:

Chemistry
1 answer:
Likurg_2 [28]2 years ago
3 0

Answer:

D

Explanation:

Recall that entropy measures the number of microstates in a substance, which is highest in gases, followed by liquids and solids. Hence, entropy increases if the products have more gaseous molecules than the reactants.

  • In reaction one, chlorine gas is converted into solid NaCl, so entropy decreaes.
  • In reaction two, four moles of gas are converted into two moles of gas, so entropy decreases.
  • In reaction three, ice is melted to form water, which has higher entropy. Thus, entropy increases.
  • In reaction four, a liquid is freezed into its solid phase, leading to a decrease in entropy.
  • In reaction five, oxygen gas is converted into solid MgO, so entropy decreases.

In conclusion, the answer is D.  

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Explanation:

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Which atom in the ground state has a partially filled second electron shell?
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Atoms have electrons filled in energy shells.
1. H - hydrogen atom has one electron in the First energy shell. Therefore hydrogen has a partially filled first energy shell

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Therefore the second energy shell is partially filled. This is the correct answer

3. K - electron configuration is 2,8,8,1
The outermost energy shell is the fourth energy shell which is partially filled. The second energy shell is completely filled

4.Na - electron configuration is 2,8,1
The outermost energy shell is the third energy shell which is partially filled
Second energy shell is completely filled

From the given options Li is the only element with a partially filled second energy shell
Answer is Li
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