Download Worksheet 2 Due beginning of class Wednesday March 3, 2004

CHEM 101
Worksheet 2
Worksheet 2
Spring 2004
Due beginning of class Wednesday March 3, 2004
Please consult our syllabus regarding how the worksheets are graded. Should you decide to do
the worksheet, it is due at the beginning of class Wednesday Mar 3, 2004. No late worksheets
will be accepted. Please observe the following format for the worksheet assignments:
Use a Bluebook. Loose-leaf pages, or spiral notebooks are not acceptable and will not be
graded. Stapled papers will not be graded.
Write your Name (last name in CAPS), sec. no., date, and WS1 on the cover. Please print in
large letters, we will be handling several hundred bluebooks, your name and section no. must be
easy to read.
Do not rewrite the questions.
Simply write the question number and provide your worked out solution. Show all of your work.
No work = No credit. Show answers to correct significant figures and use units where
appropriate. Use scientific notation where appropriate. Clearly
box-in your answers. Leave some space between problems.
This is a worksheet and it is assumed that there may be some trial and error in your work.
There is no need to erase and recopy work, simply draw and “X” or line thru what you do not
want graded, and carry on.
Neatness counts.
1.
Your work must be legible and neat. If I can’t read it, it will not be graded. If
you turn in garbage, it will be placed in the waste basket where it belongs.
Write the formula and state whether each of the following compounds is a non-, weak, or strong
electrolyte. Give a reason for your answer. Also if the compound is a strong or weak acid or
base state that.
e.g. HClO3 – strong electrolyte – completely ionized in water – strong acid
a) BaCl2
d) HCN
g) HF
b) NH4Cl
e) NaOH
h) CO2
c) H2O
f) HNO3
i) CH4
2.
Give the correct name for the following acids. Show both the formula given and the name.
a) HCl
d) HC2H3O2
g) HIO3
b) H2SO4
e) HClO4
h) HClO2
c) H3PO4
f) HBrO
i) H2SO3
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CHEM 101
3.
Worksheet 2
Spring 2004
Determine the indicated molar concentration in each of the following solutions. Show the
problem and how you worked it out. Box-in your answers. Use correct sig. fig. and units.
3+
a)
[Fe ] in 0.485 M Fe2(C2O4)3
b)
[Cl ] in 0.678 M AlCl3
c)
[Al2(SO4)3] when [Al
d)
[Na ] in 0.250 M Na3PO4
4.
-
3+
] is 0.248 M
+
Use the solubility rules to determine whether or not each of the following compounds is soluble
in water. Write the formula and state which solubility rule you used and give the reference.
e.g. MgF2 - insoluble - #4(c) p. 134 text
a) FeCl3
d) SrS
g) Pb(NO3)2
b) CaO
e) BaCO3
h) CdSO4
c) AgNO3
f) PbS
i) K3PO4
5.
Complete and balance each of the following equations. If there is no reaction, write “no
reaction”. Box-in your balancing coefficients.
a)
CaO (s) + H2O (l) →
b)
Al (s) + HCl (aq) →
c)
Ba(OH)2 (aq) + H2SO4 (aq) →
d)
MnCl2 (aq) + H2S (aq) →
e)
Pb(NO3)2 (aq) + HCl (aq) →
6.
Identify the species oxidized in each of the following redox reactions. Be specific about the
reason for your answer.
a)
2 Al (s) + 3 H2SO4 (aq) → Al2(SO4)3 (aq) + 3 H2 (g)
b)
2 FeBr3 (aq) + 3 Cl2 (g) → 2 FeCl3 (aq) + 3 Br2 (l)
c)
2 AgNO3 (aq) + Cu (s) → Cu(NO3)2 (aq) + 2 Ag (s)
7.
Identify both the oxidizing agent and reducing agent in each of the following. Be clear about
your choice.
a)
b)
2Al (s) + 6 HBr (aq) → 2 AlBr3 (aq) + 3 H2 (g)
2-
2 CrO4
+ 3 S2O4 + 2 OH + 2 H2O → 2 Cr(OH)3 + 6 SO3
2-
-
2
2-
CHEM 101
8.
Worksheet 2
Spring 2004
Given the frequency or wavelength, determine the wavelength or frequency of the following.
Use scientific notation where appropriate. Use correct significant figures and show units.
Show your work and box-in your answers.
a)
ν = 1.75 × 1022 Hz
b)
λ = 82.5 nm
c)
ν = 525 MHz
d)
λ = 0.132 pm
9.
Classify each of the following wavelengths according to its region on the spectrum of EMR,
e.g. gamma, X-ray, etc
a)
λ = 10-13 m
b)
λ = 105 Å
c)
λ = 10-7 Å
d)
λ = 108 Å
10.
Give the principal quantum number, n, the angular momentum quantum number, l, and the
allowed values of magnetic quantum number, ml, for the orbitals in each of the following
subshells.
a) 3p
d) 3d
b) 2p
e) 4f
c) 5s
f) 1s
11.
Sketch each of the following sets of orbitals, each set on the same axes and to approximate
scale. Label your axes. Do not be sloppy with these sketches.
a) 1s, 2s
b) 2px, 2py
c) 3s, 2px
d) 2px, 3px
e) 3dxz, 3dz2
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CHEM 101
Worksheet 2
2
Spring 2004
1
12.
[Ar]4s 3d is the ground state configuration for what atom? Show your work.
13.
What is the energy in joules for a photon of wavelength 1.45 × 10
-5
m? Show your work. Use
scientific notation, correct significant figures and show units.
14.
How many electrons are unpaired in the outermost shell of magnesium? Show your work.
15.
State the Pauli Exclusion Principle.
16.
What element (of lowest atomic number) has the characteristics given. Also give the electron
configuration of that element. Clearly explain your answers. Leave space between each
question.
a)
two unpaired electrons
b)
eleven p electrons
c)
three electrons with ml = 2
d)
five d electrons
e)
five electrons with ml = 1
17.
Give the four quantum numbers that identify the third p electron in sulfur. Show your work, and
explain your reasoning.
18.
Arrange the following in order of increasing value (smallest to largest) of the first ionization
energy.
a)
Be
Sr
Mg
Ca
b)
Na
Cl
Al
Ar
c)
F
Se
Ba
Ga
19.
Arrange the following in order of increasing size (smallest to largest).
a)
Ca
Sr
b)
Bi
c)
d)
Mg
Be
Cs
Tl
Ba
K
V
Ti
Fe
K
Al
Na
N
End of worksheet 2
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