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Unit 1 Practice Questions
Questions 1-4 refer to the following:
(A)
(B)
(C)
(D)
(E)
Volume
Temperature
Density
Pressure
Mass
1. Is a quantity that allows one to calculate mass if
density is known
2. Always varies with the number of molecules
present in a sample of a particular substance
3. Can be expressed as kilograms per liter
4. Is a measure of the average kinetic energy of a
substance’s molecules
1
Questions 1-3 refer to the following:
(A) The rule is to add concentrated acid to water slowly
(B) The rule is to add water to concentrated acid slowly
(C) Carefully replace unused or excess chemicals into
their properly labeled containers from which they
came
(D) Flush eyes with water at the eyewash fountain for at
least 15 minutes
(E) Dispose of chemicals in the proper places and
following posted procedures. Do not return them to
their original containers
1. The proper way to dilute a concentrated acid
2. How to properly dispose of chemicals not needed
3. What to do if a chemical splatters into your eyes
2
Questions 1-4 refer to the following:
(A)
(B)
(C)
(D)
(E)
Density
A solid
Volume
Weight
Matter
1.
2.
3.
4.
Gives the mass per unit volume
Has mass and a definite size and shape
Gives the space occupied
Has mass and occupies space
3
Questions 1-2 refer to the following:
(A)
(B)
(C)
(D)
(E)
A molecule
A mixture of compounds
An isotope
An isomer
An acid salt
1. The simplest unit of water that retains its
properties
2. A commercial cake mix
4
II
I
If the density of a
solid substance and
its volume are both
known, mass can
be calculated
For any substance,
solid, liquid or gas,
mass increases as
volume increases
BECAUSE
For any substance, the
relationship between the
mass and volume varies
directly with sample size
BECAUSE
Density represents mass
per volume
5
II
I
A substance
composed of two
or more elements
chemically
combined is called
a mixture
A chemical change
involves change in
the composition
and molecular
structure of the
reactants
BECAUSE
The properties of the
constituents of a mixture
are retained
BECAUSE
In a chemical reaction
bonds are broken and
new substances are
formed
6
II
I
The burning of
paper is a physical
change
Propane can be
decomposed
chemically
BECAUSE
When a chemical change
occurs energy is either
gained or lost by the
reactants
BECAUSE
Propane is a compound
made up of simpler
elements
7
II
I
Methane is defined
as a compound
1,100 grams is
equal to 1.100
kilograms
BECAUSE
Methane can be broken
down chemically
BECAUSE
To convert grams to
kilograms one must
divide by 100
8
II
I
It is possible to
separate a watersoluble salt from a
water-insoluble
substance
When diluting an
acid, the acid is
added to water
BECAUSE
BECAUSE
The water-soluble
substance will be caught in
the filter paper, while the
insoluble substance passes
through filter paper
The dilution of
concentrated acid can
release heat
9
II
I
The density of a
sample of water is
doubled by
doubling its mass
Iron is an element
BECAUSE
BECAUSE
Compared to a gas, the
molecules in a liquid are
relatively far apart
It cannot be broken into
smaller units and retain
its physical and chemical
properties
10
Two solid objects are of equal volume, but object A
has density = X, and object B has density = (0.5)X.
Which of the following is true concerning objects A
and B?
(A)
(B)
(C)
(D)
(E)
Objects A and B are of equal density
Object B has twice the density of object A
Objects A and B are of equal mass
Object A has one half the mass of object B
Object A has twice the mass of object B
11
The prefix centi- means
(A)
(B)
(C)
(D)
(E)
One thousand
One thousandth
One hundred
One hundredth
One millionth
12
A substance that can be further simplified by
ordinary chemical means may be which of the
following?
I. An element or a compound
II. A mixture or a compound
III. An element or a mixture
(A)
(B)
(C)
(D)
(E)
I only
II only
III only
I and II only
I , II, and III
13
Which of the following would you not do in a
laboratory setting?
I. Pour acids and bases over a sink
II. Wear goggles
III. Heat a stoppered test tube
(A)
(B)
(C)
(D)
(E)
I only
II only
III only
I and III only
I , II, and III
14
A student conducted an experiment and obtained
three values during three repetitive trials: 1.65, 1.68,
1.71. Later, the student discovered that the true value
was 2.37. In contrast to the real value, the
experimental results should be characterized as:
(A)
(B)
(C)
(D)
(E)
Not accurate and not precise
Accurate but not precise
Not accurate but precise
Accurate and precise
Accurate, precise, but unreliable
15
Which of the following is considered to be a
dangerous procedure in the laboratory setting?
(A) Pouring all liquids, especially acids and bases,
over the sink
(B) Wearing goggles
(C) Pushing glass tubing, thermometers, or glass
thistle tubes through a rubber cork
(D) Pointing the mouth of a test tube that is being
heated away from you and others
(E) Knowing where the fire extinguisher and eyewash stations are located
16
The following statements were recorded while
preparing carbon dioxide gas in the laboratory. Which
one involves an interpretation of the data rather than
an observation?
(A) No liquid was transferred from the reaction bottle
to the beaker.
(B) The quantity of solid minerals decreased.
(C) The cloudiness in the last bottle of limewater was
caused by the product of the reaction of the
colorless gas and the limewater.
(D) The bubbles of gas rising from the mineral
remained colorless throughout the experiment.
(E) There was a 4oC rise in temperature in the
reaction vessel during the experiment.
17
The property of matter that is independent of its
surrounding conditions and position is
(A)
(B)
(C)
(D)
(E)
Volume
Density
Mass
Weight
State
18
Which substance can be decomposed chemically?
(A)
(B)
(C)
(D)
(E)
Ammonia
Iron
Neon
Hydrogen
Fluorine
19
A book is lifted off the floor and placed on a table
that is one meter above the floor. The book has
(A)
(B)
(C)
(D)
(E)
Gained sound energy
Lost chemical energy
Gained potential energy
Gained kinetic energy
Lost nuclear energy
20
Which statement is incorrect regarding energy?
(A)
(B)
(C)
(D)
(E)
Energy can be given off in a reaction
Energy can be gained in a reaction
Energy cannot be created or destroyed
Energy can take various forms
Energy has mass and takes up space
21
Which type of change is different from the other
four?
(A)
(B)
(C)
(D)
(E)
Baking a potato
Rusting of an iron nail
Burning a piece of paper
Melting an ice cube
Ignition of propane
22
Which of the following is not a physical property?
(A)
(B)
(C)
(D)
(E)
Color
Phase
Odor
Boiling point
Reactivity with oxygen
23
Which substance cannot be decomposed chemically?
(A)
(B)
(C)
(D)
(E)
Ammonia
Tellurium
Methane
Water
Lunch
24
Which sample represents a homogeneous mixture?
(A)
(B)
(C)
(D)
(E)
CH3OH (l)
CH3OH (aq)
CH3OH (g)
CH3OH (s)
None of the above
25
All of the following involve a chemical change EXCEPT
(A)
(B)
(C)
(D)
The formation of HCl from H2 and Cl2
The color change when NO is exposed to air
The formation of steam from burning H2 and O2
The solidification of vegetable oil at low
temperatures
(E) The odor of NH3 when NH4Cl is rubbed together
with Ca(OH)2 powder
26
Which sample is a homogeneous mixture?
(A)
(B)
(C)
(D)
(E)
KI (aq)
Fe (s)
CO2 (g)
NH3 (l)
NaCl (s)
27
A student took a melting point of an organic
compound four times. His work produced the
following results: 97oC, 99oC, 100oC and 97oC. If the
real melting point of the compound is 88oC, then his
results can be summarized as
(A)
(B)
(C)
(D)
(E)
Both accurate and precise
Neither accurate not precise
Accurate but not precise
Precise but not accurate
extrapolated
28
In the metric system, the prefix kilo- means
(A)
(B)
(C)
(D)
(E)
100
10-1
10-2
102
103
29
All of the following are compounds EXCEPT
(A)
(B)
(C)
(D)
(E)
Copper sulfate
Carbon dioxide
Washing soda
Air
lime
30
An example of a physical property is
(A)
(B)
(C)
(D)
(E)
Rusting
Decay
Souring
Low melting point
High heat of formation
31