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Over [174]
3 years ago
6

2. Which one of the following statements is true about halogens?

Chemistry
1 answer:
Gekata [30.6K]3 years ago
5 0

Answer:

They're never found as individual elements in nature because they are so reactive.

Explanation:

Halogens are a highly reactive group of elements. They are usually found combined in nature.

  • Because each of the elements has seven electrons in the outer shells of their atoms the elements are all univalent and also acceptors of electrons.
  • They are all non-metals and oxidizing agents.
  • This makes the elements in this group highly reactive and combine readily with other species in nature.
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Calculate the entropy change for the reaction: Fe2O3(s) +3C(s) -> 2Fe(s) + 3CO(g)
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Answer:

ΔS = +541.3Jmol⁻¹K⁻¹

Explanation:

Given parameters:

Standard Entropy of Fe₂O₃ = 90Jmol⁻¹K⁻¹

Standard Entropy of C = 5.7Jmol⁻¹K⁻¹

Standard Entropy of Fe = 27.2Jmol⁻¹K⁻¹

Standard Entropy of CO = 198Jmol⁻¹K⁻¹

To find the entropy change of the reaction, we first write a balanced reaction equation:

                              Fe₂O₃ +  3C →  2Fe + 3CO

To calculate the entropy change of the reaction we simply use the equation below:

      ΔS = ∑S_{products} - ∑S_{reactants}

Therefore:

     ΔS = [(2x27.2) + (3x198)] - [(90) + (3x5.7)] = 648.4 - 107.1

                          ΔS = +541.3Jmol⁻¹K⁻¹

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