Exam Flashcards
1
Q
Boiling point of Benzyl alcohol
A
205
2
Q
Boiling point of Glycerol
A
290
3
Q
Boiling point of Ethylene alycol
A
197
4
Q
Phenol bp
A
182
5
Q
Benzaldehyde bp
A
178
6
Q
Acetophenone bp
A
202
7
Q
Nitrobenzene bp
A
211
8
Q
Aniline bp
A
184
9
Q
Phenyl acetate bp
A
196
10
Q
Chlorobenzene bp
A
132
11
Q
Methyl salieylate bp
A
223
12
Q
0-Cresol bp
A
191
13
Q
Ethyl benzoate bp
A
213
14
Q
o-Toluidine bp
A
200
15
Q
Bromobenzene bp
A
156
16
Q
Aspirin melting point
A
135 c
17
Q
Melting point of ice at 10 pressure
A
-0.06
18
Q
Melting point of ice at 100 pressure
A
-0.7
19
Q
Melting point of ice at 50 pressure
A
-0.35
20
Q
Melting point of ice at 1 pressure
A
0
21
Q
Melting point of ice at 89 pressure
A
-0.62
22
Q
Melting point of ice at 25 pressure
A
-0.17
23
Q
Melting point of ice at 65 pressure
A
-0.45
24
Q
Melting point of ice at 78 pressure
A
-0.55
25
Which is the oxidizing agent used in the test for phosphorous?
Sodium peroxide
26
In the test for nitrogen, the sodium fusion extract is acidified with
Concentrated sulphuric acid
27
A X color precipitate, which is Y in ammonium hydroxide indicates presence of chlorine. Identify X and Y.
X = white, Y = soluble
28
Carbon and hydrogen are detected by heating the compound with which of the following?
Copper (II)oxide
29
Which compound gets precipitated in the detection of carbon and hydrogen?
Calcium carbonate
30
Identify the element that cannot be detected by Lassaigne’s test.
Fluorine
31
Potassium can replace sodium in lassaigne’s test.
True
32
What is Lassaigne’s test extract called as?
Sodium fusion extract
33
What is the color of the precipitate obtained in the test for sulphur?
Black
34
In case of both nitrogen and sulphur existence, Prussian blue is still the color of the end product.
False
35
A spot of the mixture is placed
near the bottom of a piece of
chromatography paper and the
paper is then placed upright in a
suitable
such as water,
alcohol and ether
Solvent
36
Separating dyes in an ink
Chromatography
37
Separating salt from sea water
Evaporation
38
Separating water and alcohol
Fractional distillation
39
Separating soil mixed with water
Sedimentation
40
Separating sand and water
Filtration
41
separation by chromatography
include inks, dyes and colouring
agents in
Food
42
are solids, liquids or gases
Organic compound
43
are generally solids
Inorganic compounds
44
low melting points & low boiling points
Organic compound
45
high melting points & high boiling points
Inorganic
46
shows covalent bonding
Organic
47
mostly show ionic bonding
Inorganic
48
Insoluble in water
Organic
49
soluble in water
Inorganic
50
usually decompose on heating
Volatile in nature
Organic
51
Inflammable, easily catch fire
Organic
52
Do not conduct electricity
slow to react with other chemicals
Organic
53
Mostly Colorless compounds
Organic
54
usually do not decompose on heating
non-Volatile in nature
Inorganic
55
conduct electricity
Often undergo fast chemical reaction
Inorganic
56
Mostly colorful compounds
Inorganic
57
This test is used for the qualitative analysis of elements nitrogen, sulphur and halogen in Organic compounds.
Sodium fusion test
58
refers to the formation of a new, insoluble product by a chemical reaction; this product then precipitates out of the reaction solution as an amorphous solid containing many trapped impurities.
Crystallization
59
does not involve a chemical reaction; the crude product is simply dissolved into solution, and then the conditions are changed to allow crystals to re-form.This produces a more pure final product.
Recrystallization
60
is a technique used to purify solid compounds where solids tend to be more soluble in hot liquids than in cold liquids.
Recrystallization
61
refers to the process of removing brightly colored organic impurities from the sample mixture. The procedure is usually carried out in the solution phase after the solid product and impurities are dissolved in a suitable solvent.
Decolorization
62
Separation by_____ involves gentle heating of the solid mixture in a confined container until the component with high vapor pressure changes into the vapor state, while the component with lower vapor pressure is left in the container.
sublimation
63
an analogous process to boiling, as it occurs when a compound's vapor pressure equals its applied pressure (often the atmospheric pressure).
Sublimation
64
Compounds that are capable of sublimation tend to be those with
weak intermolecular forces in the solid state.
65
holds the distilling mixture; preferably a round-bottom flask designed to withstand the required input of heat
Distilling flask
66
a three-way connector directing the distilling vapor into the condenser and allows the connection of a thermometer via the thermometer adapter
Distilling head –
67
– is the part where vapor will be cooled by a constant flow of water
Water condenser
68
– connects the condenser to the receiving flask
Adapter
69
– collects the distilled liquid
Receiving flask
70
– used to hold the apparatus in place
Iron clamp and stand
71
withdrawing or separating a substance from a mixture is done by the use of solvents
Solvent extraction
72
In an extraction using a two-solvent system,_____ can be used to decrease the solubility of the non-polar component. This technique in reducing the solubility of organic solutes by saturating the mixture is called ____
methanol
Salting-out effect
73
is a technique for separating the components or solutes, of a mixture on the basis of the relative amounts of each solute distributed between a moving fluid stream, called the mobile phase, and a contiguous stationary phase
Chromatography
74
_____is a process for separating components of a mixture. To get the process started, the mixture is dissolved in a substance called the_____ phase, which carries it through a second substance called the stationary phase.
Chromatography
mobile
75
is the temperature at which the vapor pressure of the substance equals the pressure of the atmosphere above it. It is a physical constant that can be used in identification and characterization, as well as a criterion of purity of a substance.
Boiling
76
Pure compounds have a constant boiling point. Mixtures have a boiling point range except for______.
azeotropes
77
Compounds involving____ bonds have_____ boiling point because the amount of heat required to separate the ions is higher than the amount required to separate molecules in covalent compounds.
Ionic
Higher
78
Factors That Affect the Boiling Point
Strength of _______ _____
Length of ______
_______decreases the boiling point
______
_______
intermolecular forces
carbon-carbon chain
Branching
Polarity
Impurities
79
Factors That Affect the Melting Point
________ Symmetry
a.______ _____(Linear vs Branched)
b._____ vs Even chain length
Molecular Size
a. Length of_______
Polarity/_____
Molecular
Conformation and Orientation
Odd
carbon-carbon chain
Intermolecular Forces
Impurities
80
_____are substances that produce free hydrogen ions (H+ ions) when dissolved in water.
Acids
81
______are substances that produce hydroxyl ions (OH- ions) when dissolved in water.
Bases
82
_____solutions are rich in hydrogen ions and_____ solutions are poor in hydrogen ions.
Acidic
basic
83
Substances with pH ____ than 7 are acidic, those with pH____ to 7 are neutral and those with pH_____ than 7 are basic in nature. The pH of pure water is ___
Lower
Equal
Greater
7
84
is a strip of special paper that is prepared by dipping the strip in different chemical compounds and then drying it. It can be used to find the approximate pH of any solution.
pH paper
85
is an electronic instrument consisting of a special bulb that is sensitive to hydrogen ions that are present in the test solution.
pH meter
86
AgNO3
Silver nitrate
87
NaCI
Sodium chloride
88
CuO
Copper (II) oxide
89
NaOH
Sodium hydroxide
90
CaCO3
Calcium carbonate
91
NaNO3
Sodium nitrate
92
HN03
Nitric acid
93
KSCN
Potassium thiocyanate
94
Fe(NH4)(S04)2
Ammonium iron(II) sulfate
