CHM103 TMA1 Answers
Q1 Which of the
following statements is true about compounds and mixtures?
Both mixtures and
compounds always contain a fixed proportion of elements by mass.
Unlike compounds, very little or no exchange of energy occurs during
the formation of mixtures.
A mixture cannot be
easily separated into its constituents while constituents of a compound can be
easily
separated.
Compounds and
mixtures can be separated into its constituents by chemical methods.
Q2 What is a
compound?
A substance which
contains two or more elements physically combined together in fixed ratio.
A substance which
contains only metallic and non-metallic elements chemically joined together.
A substance which
cannot be separated into its simpler substances by heating alone.
A substance which is made up of two or more elements chemically
joined together.
Q3 Which of these is
an amorphous solid?
Glass
Diamond
Graphite
Sodium chloride
Q4 Which of these
mixtures is not a nearly ideal liquid mixture?
n-hexane and
n-heptane
benzene and toluene
water and ethanol
carbon tetrachloride
and silicon tetrachloride
Q5 Which of these is
not crystalline
Diamond
Polythene
Potassium iodide
Graphite
Q6 A liquid that has
high viscosity flows ____________.
slowly
rapidly
freely
briskly
Q7 A container with
volume 71.9 ml contains water vapor at a pressure of 10.4 atm and a temperature
of 465oC. How many
grams of the gas are in the container?
0.421 g
0.183 g
0.129 g
0.222 g
Q8 Which one of the
following can be separated by adding water, stirring and filtering?
Copper and tin
Salt and sugar
Sulfur and sugar
Salt and copper
sulphate
Q9 A mixture of graphite
and diamond constitutes __________ phases.
one
two
three
four
Q10 The molarity of
urea in a solution prepared by dissolving 16 g of urea (MW = 60.0 g/mol) in 39
g
of H2O is __________
M. The density of the solution is 1.3 g/mL.
0.11
3.7
6.8
6.3
Q11 The mole fraction
of He in a gaseous solution prepared from 4.0 g of He, 6.5 g of Ar, and 10.0 g
of
Ne is __________.
0.6
1.5
0.2
0.11
Q12 Which of these
describes what happens when water freezes?
a phase change occurs
from a liquid phase to a solid phase
an exothermic process
occurs where energy is lost from ice to the surroundings
the liquid water
changes from a random structure to a crystalline solid
all of the above
Q13 In filtration,
the term ‘filtrate’ refers to
the solid that
remains on the filter paper
the liquid that drains
through the filter paper.
the type of filter
paper used.
the mixture before
separation
Q14 A gas occupies a
volume of 2.4 L at 14.1 kPa. What volume will the gas occupy at 84.6 kPa?
497 L
2.5 L
14 L
0.40 L
Q15 The gaseous mixture
is a ___________ phase system.
one
two
three
four
Q16 Standard
temperature and pressure (STP) refers to which conditions?
0 K and 1 KPa
(b) 0 K and 1 mmHg
273 k and 1 atm
0 K and 1 atm
Q17 Fractional
distillation cannot be used to
separate the components
of liquid air
refine crude oil
test the purity of a substance
separate methanol and
water
Q18 The density of a
crystal depends on all the following except
Number of atoms
Its mass
Its geometry
Volume of the unit
cell
Q19 Which of these
assumes the shape of its container?
Solid
Liquid
gas
vapor
Q20 One of the
followings is not true of liquids
The inability of a liquid to flow enables it to assume the shape of
the container
A liquid never
expands to fill the container
The characteristics
of a liquid lie between those of a solid and a gas
Particles of liquid are free to move
from one point to another
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