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Descriptive Inorganic Chemistry

James House, Kathleen A. House

Chapter 8

Boron - all with Video Answers

Educators

Chapter Questions

03:13

Problem 1

Draw structures for the following molecules.
(a) Borazine
(b) The 1,2 isomer of $\mathrm{B}_{10} \mathrm{C}_2 \mathrm{H}_{12}$
(c) $\mathrm{B}_2 \mathrm{H}_6$
(d) Pentaborane(9)

Nicole Krahulik
Nicole Krahulik
Numerade Educator
08:13

Problem 2

Write complete, balanced equations for the following processes.
(a) The preparation of boron from the oxide
(b) The preparation of $\mathrm{B}_2 \mathrm{Cl}_4$
(c) The reaction of $\mathrm{BCl}_3$ with $\mathrm{C}_2 \mathrm{H}_5 \mathrm{OH}$
(d) The preparation of borazine
(e) The combustion of $\mathrm{B}_4 \mathrm{H}_{10}$

Shaelyn Deal
Shaelyn Deal
Numerade Educator
01:27

Problem 3

Explain why $\mathrm{BI}_3$ is less stable than are the other boron halides.

Grigoriy Sereda
Grigoriy Sereda
Numerade Educator
03:14

Problem 4

Explain why $\mathrm{BF}_3$ is a weaker Lewis acid than $\mathrm{BCl}_3$ toward a base such as $\mathrm{NH}_3$.

Shazia Naz
Shazia Naz
Numerade Educator
08:13

Problem 5

Write balanced equations for each of the following processes.
(a) Preparation of $\mathrm{B}_3 \mathrm{~N}_3 \mathrm{H}_6$
(b) The reaction of $\mathrm{B}_3 \mathrm{~N}_3 \mathrm{Cl}_3 \mathrm{H}_3$ with $\mathrm{CH}_3 \mathrm{OH}$
(c) Preparation of $\left(\mathrm{C}_6 \mathrm{H}_5\right)_3 \mathrm{~B}$

Shaelyn Deal
Shaelyn Deal
Numerade Educator
02:57

Problem 6

On the basis of its structure, explain why boric acid is a weak acid that functions by complexing with $\mathrm{OH}^{-}$. Draw the structure for the product.

Sima Sarker
Sima Sarker
Numerade Educator
07:51

Problem 7

How would you predict that $\mathrm{BF}_3$ and $\mathrm{B}\left(\mathrm{CH}_3\right)_3$ would interact with the following molecule?

Shaelyn Deal
Shaelyn Deal
Numerade Educator
05:24

Problem 8

In the preparation of the adduct of $\mathrm{B}\left(\mathrm{CH}_3\right)_3$ with ether, pyridine $\left(\mathrm{C}_5 \mathrm{H}_5 \mathrm{~N}\right)$ cannot be used as a solvent. In the preparation of the adduct of $\mathrm{B}\left(\mathrm{CH}_3\right)_3$ with pyridine, ether can be used as the solvent. Explain the difference between the two cases.

Preeti Kumari
Preeti Kumari
Numerade Educator
03:20

Problem 9

Would $\left(\mathrm{C}_2 \mathrm{H}_5\right)_3 \mathrm{~N}$ or $\left(\mathrm{C}_2 \mathrm{H}_5\right)_3 \mathrm{P}$ form a stronger bond to $\mathrm{BCl}_3$ ? Explain your answer.

Himanshu Kushwaha
Himanshu Kushwaha
Numerade Educator
01:10

Problem 10

In $\mathrm{BF}_3$, the $\mathrm{B}-\mathrm{F}$ bond length is $130 \mathrm{pm}$, but in $\mathrm{BF}_4^{-}$it is approximately $145 \mathrm{pm}$. Explain this difference in the B-F bond lengths.

Mahendra K
Mahendra K
Numerade Educator
01:21

Problem 11

Draw structures for the possible isomers of $\mathrm{B}_3 \mathrm{~N}_3 \mathrm{Cl}_3 \mathrm{H}_3$.

Sydney Atkins
Sydney Atkins
Numerade Educator
01:45

Problem 12

Would it be likely if $\mathrm{BCl}_3$ were dissolved in water that evaporating the water would allow $\mathrm{BCl}_3$ to be recovered? Write equations to explain your answer.

Mahendra K
Mahendra K
Numerade Educator
01:17

Problem 13

Draw the structure for the boric acid molecule. It is possible for this compound to give a weakly acidic solution but without the loss of a proton. Show using an equation how this could occur.

Devon Burke
Devon Burke
Numerade Educator
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Problem 14

Suppose the molecule $\mathrm{H}_2 \mathrm{PCH}_2 \mathrm{CH}_2 \mathrm{NH}_2$ were to interact with one molecule of $\mathrm{B}\left(\mathrm{CH}_3\right)_3$ and one of $\mathrm{BCl}_3$. What would be the product? Explain your answer.

Susan Hallstrom
Susan Hallstrom
Numerade Educator