Chemistry for Engineering Students
Chemistry for Engineering Students
3rd Edition
ISBN: 9781285199023
Author: Lawrence S. Brown, Tom Holme
Publisher: Cengage Learning
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From part a : answer the question
Questions
1. Give two qualitative observations for each
sample upon closer examination of the
respective photos.
2. Sample Four was the only sample that
contained an odour. What does this suggest
about the ease with which the particles can
leave the solid with respect to the strength
of the intermolecular forces of attraction
between the particles? (
3. Which sample has mobie electrons for
which to conduct electricity?
4. Sample Four was the only one that was
soluble in a nonpolar solvent. What does
this suggest about the polarity of the
molecule in Sample Four?
5. Sample One was soluble in water and in its
molten state conducted electricity, but in its
solid state it did not conduct electricity.
Electrons only flow in solids to produce
current electricity. What types of particles
does the experimental evidence point to the
makeup of this sample? (.
6. What evidence is there to support the
formation of ionic or molecular liquids of
nonpolar crystals?
7. What could you deduce about the strength
of the forces of attraction between the
particles, in Sample 3, compared to the
other samples? (1 mark)
8. Give 3 more physical tests to help you in
your analysis of these samples and their
subsequent identification.
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Transcribed Image Text:Questions 1. Give two qualitative observations for each sample upon closer examination of the respective photos. 2. Sample Four was the only sample that contained an odour. What does this suggest about the ease with which the particles can leave the solid with respect to the strength of the intermolecular forces of attraction between the particles? ( 3. Which sample has mobie electrons for which to conduct electricity? 4. Sample Four was the only one that was soluble in a nonpolar solvent. What does this suggest about the polarity of the molecule in Sample Four? 5. Sample One was soluble in water and in its molten state conducted electricity, but in its solid state it did not conduct electricity. Electrons only flow in solids to produce current electricity. What types of particles does the experimental evidence point to the makeup of this sample? (. 6. What evidence is there to support the formation of ionic or molecular liquids of nonpolar crystals? 7. What could you deduce about the strength of the forces of attraction between the particles, in Sample 3, compared to the other samples? (1 mark) 8. Give 3 more physical tests to help you in your analysis of these samples and their subsequent identification.
You are a chemist working in a laboratory
where unknown samples are given to you to
test and identify. Your first assignment is to
identify five unknown samples and state their
respective type of crystalline solid. The
experimental results are for you to examine
and make your final conclusions.
Samples:
Sample 1
Sample 2
Sample 3
Sample 4
Part A- Chemical Analyses
In addition to the visual observations you can
make from the photos of the samples, the
following results are from analyses of the
samples:
Sample One
Odour- Odourless
Solubility in water- soluble
Solubility in hexane- insoluble
Electrical conductivity of solid- no conduction
Electrical conductivity in molten state-
conducts
Sample Two
Odour- Odourless
Solubility in water- insoluble
Solubility in hexane- insoluble
Electrical conductivity of solid- conducts
electricity
Electrical conductivity in molten state-
conducts
Sample Three
Odour- Odourless
Solubility in water- insoluble
Solubility in hexane- insoluble
Electrical conductivity of solid- no conduction
Electrical conductivity in molten state-
melting point is too high. No results.
Sample Four
Odour- sharp aromatic odour
Solubility in water- insoluble
Solubility in hexane- soluble
Electrical conductivity of solid- no conduction
Electrical conductivity in molten state- no
conduction
expand button
Transcribed Image Text:You are a chemist working in a laboratory where unknown samples are given to you to test and identify. Your first assignment is to identify five unknown samples and state their respective type of crystalline solid. The experimental results are for you to examine and make your final conclusions. Samples: Sample 1 Sample 2 Sample 3 Sample 4 Part A- Chemical Analyses In addition to the visual observations you can make from the photos of the samples, the following results are from analyses of the samples: Sample One Odour- Odourless Solubility in water- soluble Solubility in hexane- insoluble Electrical conductivity of solid- no conduction Electrical conductivity in molten state- conducts Sample Two Odour- Odourless Solubility in water- insoluble Solubility in hexane- insoluble Electrical conductivity of solid- conducts electricity Electrical conductivity in molten state- conducts Sample Three Odour- Odourless Solubility in water- insoluble Solubility in hexane- insoluble Electrical conductivity of solid- no conduction Electrical conductivity in molten state- melting point is too high. No results. Sample Four Odour- sharp aromatic odour Solubility in water- insoluble Solubility in hexane- soluble Electrical conductivity of solid- no conduction Electrical conductivity in molten state- no conduction
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