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Organic Chemistry Fundamentals: Separation, Identification, and Analysis - Prof. Christoph, Exercises of Chemistry

Housatonic Community CollegeChemistry
Prof. Christopher J. Leary

A range of topics in foundation-level organic chemistry, including the unique properties of carbon, separation techniques for organic molecules, qualitative identification of elements, key information from spectroscopic methods, and the determination of empirical and molecular formulas. It also addresses factors influencing separation method selection, the analysis of a beta-blocker drug, and the classification and identification of functional groups. A comprehensive overview of fundamental organic chemistry concepts and techniques, making it a valuable resource for university-level chemistry students.

Typology: Exercises

2021/2022

Uploaded on 01/27/2023

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DEPARTMENT OF CHEMISTRY
UNIVERSITY OF GHANA, LEGON
CHEM 114 – FOUNDATION CHEMISTRY II
TUTORIAL SET I, 2020/2021
1. Outline features that make Carbon atom unique in the study of organic molecule.
2. List any four separation methods used in separating organic molecules and describe
any one.
3. Outline how the following elements can be qualitatively identify in any organic
compound. Support your answers with balanced chemical equations where possible.
a. Hydrogen b. Carbon c. Sulphur d. Nitrogen e. Bromine
4. Highlight the key information that can be obtained from the following spectroscopic
methods.
a. IR Spectroscopy b. UV/VIS Spectroscopy c. NMR Spectroscopy
d. Mass Spectrometry.
5. In the chemical analysis, of an organic molecule by Students in University of Ghana,
it was observed that the molecule was 54.00% Carbon, 3.02% Hydrogen, 22.02%
Oxygen and 20.96% Nitrogen. Determine the empirical formula of the compound.
6. In Organic chemistry, the choice of a particular method of separation depends on
some factors. Mention any four of these factors.
7. The beta-blocker drug, timolol, is expected to reduce the need for the heart bypass
surgery. Its composition by mass is 49.4% C, 7.64% H, 17.7% N, 15.2% O and
10.1% S. The mass of 0.0100 mole of timolol is 3.16 g. What is the empirical and
molecular formula of timolol.
8. What purification technique(s) could be used to separate the following mixtures?
a. Petroleum.
b. Ethanol and water.
c. Sand and naphthalene.
d. Sand and acetanilide
e. Water and vegetable oil.
9. Circle the functional groups present in the compound below. For each functional
group circled, identify the family name.
pf3

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Download Organic Chemistry Fundamentals: Separation, Identification, and Analysis - Prof. Christoph and more Exercises Chemistry in PDF only on Docsity!

DEPARTMENT OF CHEMISTRY

UNIVERSITY OF GHANA, LEGON

CHEM 114 – FOUNDATION CHEMISTRY II

TUTORIAL SET I, 2020/

  1. Outline features that make Carbon atom unique in the study of organic molecule.
  2. List any four separation methods used in separating organic molecules and describe any one.
  3. Outline how the following elements can be qualitatively identify in any organic compound. Support your answers with balanced chemical equations where possible. a. Hydrogen b. Carbon c. Sulphur d. Nitrogen e. Bromine
  4. Highlight the key information that can be obtained from the following spectroscopic methods. a. IR Spectroscopy b. UV/VIS Spectroscopy c. NMR Spectroscopy d. Mass Spectrometry.
  5. In the chemical analysis, of an organic molecule by Students in University of Ghana, it was observed that the molecule was 54.00% Carbon, 3.02% Hydrogen, 22.02% Oxygen and 20.96% Nitrogen. Determine the empirical formula of the compound. 6. In Organic chemistry, the choice of a particular method of separation depends on some factors. Mention any four of these factors. 7. The beta-blocker drug, timolol , is expected to reduce the need for the heart bypass surgery. Its composition by mass is 49.4% C, 7.64% H, 17.7% N, 15.2% O and 10.1% S. The mass of 0.0100 mole of timolol is 3.16 g. What is the empirical and molecular formula of timolol.
  6. What purification technique(s) could be used to separate the following mixtures? a. Petroleum. b. Ethanol and water. c. Sand and naphthalene. d. Sand and acetanilide e. Water and vegetable oil.
  7. Circle the functional groups present in the compound below. For each functional group circled, identify the family name.
  1. If 10.0g of an organic compound is combusted in excess O2(g) to give 20.0g of Carbon (IV) oxide and 5.0g of water vapour, what is the molecular formula of the compound? Take molar mass of the compound to be 83.947g/mol.
  2. Chemical analysis of an unknown compound revealed the following elemental compositions. 40.9% Carbon, 4.58% Hydrogen and 54.5% Oxygen. If the molar mass of the compound is 176.1g/mol find the empirical formula and the molecular formula of the unknown compound.
  3. Classify the following compounds into their respective families. For each compound state the functional group(s) present.
  4. Identify stationary phase, mobile phase and the separation principle employed by chromatographic techniques listed in the table below by completing the table.

Type of Chromatography

Stationary Phase Mobile Phase Principle of separation

Column Solid Paper Partition Thin Layer Gas-Liquid

  1. Determine the empirical formula of a compound with the following composition by mass: 60.0 % C, 8.0 % H and 32.0 % O. If 100 mg of this compound is neutralized with exactly 10.0 mL of 0.0500 M NaOH in a reaction with a 1:1 stoichiometry, what is the molecular formula of this compound?
  2. Analysis of a 12.04 g sample of a liquid compound composed of carbon, hydrogen, and nitrogen showed it to contain 7.34 g C, 1.85 g H, and 2.85 g N. What is the percent composition of this compound?
  3. Aspirin is a compound with the molecular formula C 9 H 8 O 4. What is its elemental percent composition?
  4. Give the molecular and empirical formula for each of the compound below:
  5. List five properties of a good solvent for recrystallization.