Exam (elaborations)
CHE1502 EXAM PACK 2023
- Course
- Institution
latest questions and elaborate answers
[Show more]
Seller
Follow
kymih
Reviews received
Content preview
CHE1502 EXAM PACK2023
QUESTIONS AND ANSWERS
For inquiries and assignment help
Email: smartwritingcompany@gmail.com
WhatsApp: +254704997747
, ASSIGNMENT 01
ANSWERS
TOPICS: Fundamental Concepts in Organic Chemistry, Alkanes and
Cycloalkanes, Stereochemistry and Alkyl Halides (Structure,
Properties, Nomenclature and Nucleophilic Substitution
Reactions)
1. Which of the following statements is INCORRECT?
(1) There are 3 distinct p orbitals in the second electron shell, where n = 2.
2 2 3
(2) The electron configuration of nitrogen is 1s 2s 2p
(3) The electron density of s orbitals has spherical symmetry.
(4) Hund's rule tells us that each orbital can hold a maximum of 2 electrons.
Correct Answer:
(4) Hund’s rule tells us that each orbital can hold a maximum of 2 electrons.
The above statement is INCORRECT. Hund’s rule tells us that that electrons in the same
energy level occupy as many available orbitals before pairs are formed in an orbital or
the electrons in singly occupied orbitals have the same spin.
2. Which of the following statements are INCORRECT?
(1) A carbon-hydrogen bond in methane, CH3, is nonpolar
(2) Electronegativity is the property of the atoms forming a given bond which
determines the polarity of the bond.
(3) Covalent bonds can only be polar.
(4) The electronegativity of elements on the periodic table increases going to the right
in each row.
Correct Answer:
(3) Covalent bonds can only be polar.
2
, CHE1502/001/0/2021
The above statement is INCORRECT because covalent bonds can be polar or non-polar,
depending on the electronegativity of atoms involved in the bond.
3. Which of the following statements represents the CORRECT type of bonding in the
following compounds?
(1) CH3OH ; ionic bonding
(2) CH3CH2CH2Br ; polar covalent bonding
(3) H-F ; ionic bonding
(4) CH3CH2OK ; covalent bonding
Correct Answer:
(2) CH3CH2CH2Br ; polar covalent bonding
The above statement is correct because the C-Br bond that is polar.
Covalent bonding: Within a bond, the electronegativity of an atom is the ability of an atom to
attract bonding electrons towards itself. Covalent bonding within the compound involves the
sharing of electrons between atoms involved in bond formation. A nonpolar covalent bond
exists between atoms having a very small or zero difference in electronegativity. A polar
covalent bond exists between atoms having a very small or zero difference in electronegativity.
A compound such as butane, CH3-CH2-CH2-CH3 is a non-polar compound and the compound
CH3CH2CH2Br is a polar compound.
Ionic Bonding: An ionic bond within a compound is formed by the electrostatic attraction
between a positive and negatively charged ions, i.e. when there is a big difference in
electronegativity of the atoms involved in bond formation.
The corrections to the other options are:
1) polar covalent bonding
3) polar covalent bonding
4) Rewrite the CH3CH2OK as CH3CH2O- K+. An ionic bond exists between the O- and K+
and covalent bonding exists between the atoms in the ethoxide ion, CH3CH2O-.
3
, 4. Which of the following Lewis structures is INCORRECT?
(1) nitric acid
O
H O N
O
(2) sulphuric acid
O
H O S O H
O
(3) methyl nitrite
CH3 O N O
(4) thionyl chloride
O
Cl S Cl
Correct Answer:
(4) thionyl chloride
O
Cl S Cl
The above Lewis structure is INCORRECT
The correct Lewis structure of thionyl chloride is:
4
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller kymih. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $3.28. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
50843 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now