Hitendra Singh

University of North Carolina at Chapel Hill
Tutor

Biography

I am chemistry specialist and having sound knowledge of chemistry with great explaining skills.

Education

BS Physics
University of North Carolina at Chapel Hill

Educator Statistics

Numerade tutor for 5 years
3516 Students Helped

Topics Covered

Effective Solutions for Your Business Needs
Atoms, Molecules, and Ions: Understanding the Building Blocks of Matter
Unlocking the Power of Composition: Tips and Techniques
Acids and bases
Acid-Base Equilibria: Understanding the Balance
Understanding Acids and Bases: A Comprehensive Guide
Unlocking the Power of Periodic Table Properties | Boost Your Knowledge
Periodic Table
Unlock the Secrets of Organic Chemistry: Essential Guide
Substitution and elimination reactions
Addition reactions of alkenes
Understanding Chemical Bonding: The Key to Molecular Structure
Understanding Structure and Bonding: A Comprehensive Guide
Explore the Fascinating World of Molecular Geometry - Discover More!
Discover the Properties of Alkyl Halides | Essential Guide
Nucleophilic Substitution
Alcohols and phenols
Mastering the Structure & Synthesis of Alcohols: A Comprehensive Guide
Ethers, Epoxides, and Thioethers: Understanding their Properties
Aqueous Equilibria: Understanding the Balance of Solutions
Discover the Wonders of Chemistry: Your Introductory Guide
Understanding Electronic Structure: A Comprehensive Guide
Understanding Chemical Equilibrium: A Comprehensive Guide
Discover the Power of Liquids: Boost Your Health and Wellness Today!
Unlocking the Wonders of Organic Chemistry: An Introduction
Functional Groups
Unlocking the Secrets of Stereochemistry: Exploring Molecular Structures

Hitendra's Textbook Answer Videos

02:54
Inorganic Chemistry

Three isomers having the formula $\mathrm{N}_{2} \mathrm{CO}$ are known: ONCN (nitrosyl cyanide), ONNC (nitrosyl isocyanide), and NOCN (isonitrosyl cyanide). Draw the most important resonance structures of these isomers, and determine the formal charges. Which isomer do you predict to be the most stable (lowest energy) form? (See G. Maier, H. P. Reinsenauer, J. Eckwert, M. Naumann, M. De Marco, Angew. Chem., Int. Ed. $1997,36,1707 .

Chapter 3: Simple Bonding Theory
Hitendra Singh
03:05
Inorganic Chemistry

Give Lewis dot structures and sketch the shapes of the following:
a. $\mathrm{ICl}_{2}^{-}$
b. $\mathrm{H}_{3} \mathrm{PO}_{3}$ (one $\mathrm{H}$ is bonded to $\mathrm{P}$ )
c. $\mathrm{BH}_{4}^{-}$
d. $\mathrm{POCl}_{3}$
e. $\mathrm{IO}_{4}^{-}$
f. $\mathrm{IO}(\mathrm{OH})_{5}$
$\mathrm{g} \cdot \mathrm{SOCl}_{2}$
h. $\mathrm{ClOF}_{4}^{-}$
i. $\mathrm{XeO}_{2} \mathrm{F}_{2}$

Chapter 3: Simple Bonding Theory
Hitendra Singh
02:25
Inorganic Chemistry

Give Lewis dot structures and sketch the shapes of the following:
a. $\mathrm{SOF}_{6}(\text { one } \mathrm{F} \text { is attached to } \mathrm{O})$
b. $\mathrm{POF}_{3}$
$\mathbf{c}, \quad \mathrm{ClO}_{2}$
d. $\mathrm{NO}_{2}$
e. $S_{2} O_{4}^{2-}$ (symmetric, with an $S-S$ bond)
f. $\quad \mathrm{N}_{2} \mathrm{H}_{4}(\text { symmetric, with an } \mathrm{N}-\mathrm{N} \text { bond })$
g. $\mathrm{ClOF}_{2}^{+}$
h. $\mathrm{CS}_{2}$
i. $\quad \mathrm{XeOF}_{5}^{-}$

Chapter 3: Simple Bonding Theory
Hitendra Singh
00:57
Inorganic Chemistry

Explain the trends in bond angles and bond lengths of the following ions:
$$\begin{array}{lcc}
& \mathrm{X}-\mathrm{O}(\mathrm{pm}) & \mathrm{O}-\mathrm{X}-\mathrm{O} \text { Angle } \\
\mathrm{ClO}_{3}^{-} & 149 & 107^{\circ} \\
\mathrm{BrO}_{3}^{-} & 165 & 104^{\circ} \\
\mathrm{IO}_{3}^{-} & 181 & 100^{\circ} \\
\hline
\end{array}$$

Chapter 3: Simple Bonding Theory
Hitendra Singh
01:35
Inorganic Chemistry

a. Compare the structures of the azide ion, $\mathrm{N}_{3}^{-},$ and the ozone molecule, $\mathrm{O}_{3}$
b. How would you expect the structure of the ozonide ion, $\mathrm{O}_{3}^{-},$ to differ from that of ozone?

Chapter 3: Simple Bonding Theory
Hitendra Singh
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Hitendra's Quick Ask Videos

01:40
Chemistry 101

Which bonds are broken when a solid sample of calcium nitrate, Ca(NO3)2, is dissolved in water?
a.) the covalent bonds between nitrogen atoms and oxygen atoms in the nitrate ion.
b.) the covalent bonds between the 2 nitrate ions.
c.) the ionic bonds between calcium ions and nitrate ions.
d.) the covalent bonds between hydrogen and oxygen in water.

Hitendra Singh
02:10
Chemistry 101

1) What is present in an aqueous solution of sucrose,
C12H22O11? Check all possible
answers.
a) hydroxide anions
b) water
c) carbon cations
d) C12H22O11 molecules
e) hydronium cations
2) If you are given 300.0 mL of a 0.250 M
Pb(NO3)2(aq) solution, what mass, in
grams, of lead(II) nitrate would you need to add to that solution
in order to increase its molarity to 0.500 M, assuming the amount
of lead(II) nitrate added does not change the volume. (Formula mass
of Pb(NO3)2 = 331.2 g/mol). Give your
answer to 3 significant figures.
3) The molarity of a sodium hydroxide solution was determined to
be 0.125 M. What volume in mL of this NaOH (aq) solution contains
0.150 g of sodium hydroxide? (Formula Mass of NaOH = 40.0 g/mol).
Give your answer to 1 decimal place.

Hitendra Singh
03:38
Chemistry 101

1. What is the maximum mass in g of
H3PO4 that can be made from 50.0 g
PCl5 and 15.0 g H2O in the following
reaction?
PCl5 (l) + 4 H2O (l)
→ H3PO4 (l) + 5
HCl (g)
Molar mass PCl5 = 208.24 g/mol
Molar mass H2O = 18.02 g/mol
Molar mass H3PO4 = 98.00
g/mol
2. In a mixture containing 10.5 moles Au, 17.5 moles NaCN,
4.5 moles O2, and 6.2 moles H2O, which
is the limiting reactant in the following reaction?
4 Au (s) + 8 NaCN (aq) +
O2 (g) + 2 H2O (l)
→ 4 NaAu(CN)2 (aq) + 4
NaOH (aq)

Hitendra Singh
01:30
Chemistry 101

The chemical stockroom is supplied with the following stock
solutions: 0.100 M HCl, 0.0200 M NaOH, 0.0500 M KOH, 10.0% HBr
(wt/vol), and 5.00% Na2CO3 (wt/vol). What volume of stock solution
would be needed to obtain the following amounts of solutes? (a)
0.0500 mol HCl, (b) 0.0100 mol NaOH, (c) 0.100 mol KOH, (d) 5.00 g
HBr, (e) 4.00 g Na2CO3, (f) 1.00 mol HBr, (g) 0.500 mol Na2CO3.

Hitendra Singh
04:47
Chemistry 101

1. Calculate the Ksp value for PbCl2 if 50.0 mL of a saturated solution of PbCl2 has 0.2207 g of PbCl2 dissolved in it.
2. Calculate the solubility of PbCrO4 in a solution that contains 25.0 mL of 0.0020 M K2CrO4 mixed with 75.0 mL of 0.000125 M Pb(NO3)2.

Hitendra Singh
04:14
Chemistry 101


Several brands of antacid tablets use aluminum hydroxide to
neutralize excess acid. The molar masses are in g/mol.
Al(OH)3(s) + 3
HCl(aq) ® AlCl3(aq) + 3
H2O(l)
[Molar masses:
78.01
36.46
133.4
18.02]
How many moles of HCl can be neutralized by 0.02 moles of
Al(OH)3?
How many moles of Al(OH)3 would be required to
neutralize 0.36 g of HCl?
What quantity of HCl, in grams, can a tablet with 0.750 g of
Al(OH)3 neutralize?
What quantity of water is produced from 0.750 g of
Al(OH)3?
2. Your body deals with excess nitrogen by excreting it in
the form of urea, NH2CONH2. The
reaction producing it is the combination of arginine
(C6H14N4O2) with water
to give urea and ornithine
(C5H12N2O2).
C6H14N4O2 +
H2O ® NH2CONH2
+ C5H12N2O2
[Molar masses:
174.2
18.02
60.06
132.2]
If you excrete 95 mg of urea, what quantity of arginine must
have been used?
What quantity of ornithine must have been produced?
Identify the compound or ion in which the oxidation
number of sulfur is the lowest.
HSO4-
H2S
SO3 SO2

Hitendra Singh
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