Transcript Exam I Review - Ellicott School District 22

Exam I Review
Chapters 1, 2, 21, and 3
Format of the test
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21 multiple choice questions (no calculator) –
21 points
8 Nomenclature Problems– 20 points
5 Reaction Prediction Problems– 20 points
5 problems – points vary – 40 points total
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Density, etc. – chp 1-type problem
Nuclear Composition (p, n, e, symbol, etc)
Molar Conversions
Emperical/Molecular Formula
Stoichiometry/Limiting Reactant/% yield
2 bonus problem – 10 points max.
1.
A combination of sand, salt, and water is
an example of a __________.
a.
b.
c.
d.
e.
homogeneous mixture
heterogeneous mixture
compound
pure substance
solid
B

See section 1.2
2.
Which one of the following is a pure
substance?
a.
b.
c.
d.
e.
concrete
wood
salt water
elemental copper
milk
D

Again, section 1.2
3. Which one of the following is often
easily separated into its components by
simple techniques such as filtering or
decanting?
a.
b.
c.
d.
e.
heterogeneous mixture
compounds
homogeneous mixture
elements
solutions
A
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Still section 1.2
4.
For which of the following can
the composition vary?
a.
pure substance
b. element
c.
both homogeneous and
heterogeneous mixtures
d. homogeneous mixture
e.
heterogeneous mixture
C
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You guessed it…section 1.2
5.
If matter is uniform throughout and
cannot be separated into other
substances by physical means, it is
a.
b.
c.
d.
e.
a compound
either an element or a compound
a homogeneous mixture
a heterogeneous mixture
an element
B

And we’re still in section 1.2…
6.
Which one of the following is an
intensive property?
a.
b.
c.
d.
e.
mass
temperature
heat content
volume
amount
B
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Finally…a new section. Definition in sec 1.3
7.
Which of the following is a chemical
property of sodium chloride?
a.
It melts at a very high temperature.
b. It is a solid at room temperature.
c.
It dissolves in water.
d. It can be decomposed into sodium
metal and chlorine gas.
e.
It is not significantly compressible
D
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Still in section 1.3
8.
Which of the following has the same
number of significant figures as the
number 1.00310?
a.
b.
c.
d.
e.
1 x 106
199.791
8.66
5.119
100
B
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Sig. figs are reviewed in section 1.5
9.
What is the correct answer (reported
to the proper number of significant
figures) to the following?
6.3 x 3.25 =
a.
b.
c.
d.
e.
20
20.475
20.48
20.5
21
A
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Sec 1.5
10. Round the number 0.07535 to
two significant figures.
a.
b.
c.
d.
e.
0.08
0.076
0.0754
0.075
0.07535
D

Sec 1.5
11. Which one of the following is not
one of the postulates of Dalton's atomic
theory?
a.
Each element is composed of tiny, indivisible
particles called atoms.
b.
All atoms of a given element are identical to each
other and different from those of other elements.
c.
During a chemical reaction, atoms are changed
into atoms of different elements.
d.
Compounds are formed when atoms of different
elements combine.
e.
Atoms of an element are not changed into
different types of atoms by chemical reactions.
C

Sec 2.1 (or just think about this!)
12. Rutherford's gold foil experiment
showed that
a.
the "plum-pudding" model of the atom was
incorrect
b.
most of the mass of an atom is concentrated in a
tiny portion of its total volume
c.
the positively charged particles within an atom are
concentrated in a tiny portion of its volume
d.
alpha-particles are less massive than gold nuclei
e.
all of these are correct
E
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Sec 2.2
13. Which isotope has 45 neutrons?
a.
b.
c.
d.
e.
80
36 Kr
80
35 Br
78
34 Se
34
17 Cl
103
45 Rh
B
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Sec 2.3
14. Isotopes are atoms that have the
same number of _________ but differing
number of _________.
a.
b.
c.
d.
e.
protons, electrons
neutrons, protons
protons, neutrons
electrons, protons
neutrons, electrons
C
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Sec 2.3
15. Which pair of elements below
should be the most similar in chemical
properties?
a.
b.
c.
d.
e.
N and O
P and S
K and Ca
K and Mg
Sr and Ba
E
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These two elements are in the same group (or
family)…that’s the most important thing when
determining similar chemical behavior.
16. An element in the upper right
corner of the periodic table
a.
b.
c.
d.
e.
is either a metal or metalloid
is definitely a metal
is either a metalloid or a non-metal
is definitely a non-metal
is definitely a metalloid
D

See your periodic table! (or page 45)
17. Elements in Group 2A are known as
the
a.
b.
c.
d.
e.
alkaline earth metals
alkali metals
chalcogens
halogens
noble gases
A
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Sec 2.5
18. Which pair of elements is most
likely to form a molecular compound?
a.
b.
c.
d.
e.
aluminum, oxygen
magnesium, iodine
sulfur, fluorine
potassium, lithium
barium, bromine
C
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Sec 2.6
19. Element X reacts with sodium to
form an ionic compound with the
formula Na2X. Element X is a member
of group
a.
b.
c.
d.
e.
2A
15 (5A)
16 (6A)
17 (7A)
1A
C
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Sec 2.7
20. What is the mass number of an
alpha particle?
a.
b.
c.
d.
e.
0
1
2
3
4
E
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See your chapter 21 notes
21. This reaction is an example of
210
206
84 Po  82 Pb + _____
a.
b.
c.
d.
e.
alpha decay
beta emission
gamma emission
positron emission
electron capture
A
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Chp 21
The products of a complete
combustion reaction are:
a.
b.
c.
d.
H2O and CO
H2O and CO2
H2O2 and CO2
It is different for every reaction.
B
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Sec 3.2
When lithium is added to water, the
products are:
a.
b.
c.
d.
e.
Li2O and H2
Li and H2O
Li2O and H2O
LiOH and H2
LiOH and H2O
D
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Sec 3.2
When a metal oxide is added to
water, the product will be:
a.
b.
c.
d.
Impossible to predict
The metal hydroxide
The metal oxide is insoluble
Hydrogen gas and a metal hydroxide
B
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Sec 3.2
Na2CO3 + heat 
a.
b.
c.
d.
Na + CO2
Na2O + CO
Na2O + CO2
Na2O + O2 + CO
C
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Sec 3.2