Download Worksheet 2: 1-19-17 - Iowa State University

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Worksheet 2, ch 2
Supplemental Instruction
Iowa State University
Matt HermsenWhite
Chem 177
Dr Irmi Schewe-Miller
1-19-17
1. State the Law of Conservation of Mass
2. Which of the following is not part of Daltons Atomic Theory of Matter?
a. atoms cannot be changed to other elements by chemical reactions
b. atoms of the same element are identical to one another
c. elements are composed of atoms
d. multiple atoms of the same element can combine to form other elements
3. Complete the following
Location in Atom
Charge
Mass (amu)
Proton
Neutron
Electron
4. How many protons, neutrons, and electrons are in the following atoms?
a.
12
e.
16
C
O
b.
14
f.
238
C
U
c.
119
g.
56
Sn
Fe
d.
40
h.
27
Ca
Al
5. What happens to an atom if you change the following components?
a. proton:
b. neutron:
c. electron:
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6. Which of the following are isotopes of each other?
a.
12
b.
24
c.
27
12
B
Mg
22
Al
C
Mg
28
Si
12
26
N
Mg
29
P
7. Calculate the average atomic mass for Mg using the following data
Isotope
% Abundance
Atomic Mass (amu)
24Mg
78.99
23.98504
25Mg
10.00
24.98584
26Mg
11.01
25.98259
8. The radius of a gold atom is 1.35 Å.
a. Express this distance in micro meters.
b. How many gold atoms would it take to span the length of one gold bar?
(1 gold bar = 10.25 cm long)
9. In an experiment, a scientist prepared 3 different compounds containing only iodine and
fluorine. Calculate the mass of iodine per fluorine in each compound.
Compound
Mass Iodine (g)
Mass Fluorine (g)
A
4.75
3.56
B
7.64
3.43
C
9.41
9.86
Which chemical Law is shown by this data?