Student #: ________
Practice Quiz 2
Block:
________
Chemistry I – Mr. Patel
Name ___________________________________________________
Date ______________________
Answer the following questions to prepare for Quiz 2. This quiz covers elements, polyatomic ions, and
Unit 2 topics.
1. Identify the following elements or symbols.
a. H
e.
b. Phosphorus
f.
c. Xe
g.
d. Silver
h.
U
Cu
Bromine
F
2. Identify the following polyatomic Ions by name or formula.
a. Hydrogen
c. NO21Carbonate
d. Acetate
1b. CN
e. HSO31-
i.
j.
Sodium
Lead
f. Nitrate
g. Hydrogen
Sulfate
3. Answer the following definition/concept problems thoroughly.
a. Define atom.
b. What are the three subatomic particles? Symbols? Charge? Relative Mass (with units)?
c. What is a nuclear force?
d. What are the four parts of the atomic theory?
e. Define atomic number.
f. Define mass number.
g. Define atomic mass.
h. Define isotope.
i. Describe Rutherford’s Atomic Model.
j. What are the differences between nuclear and chemical reactions?
k. What does the following radiation particle look like: alpha particle, beta particle, gamma
ray? Know these names and symbols!
4. Describe the full contribution (discussed in class) of the following people. Know these people!
a. Democritus
d. Chadwick
b. Dalton
e. Rutherford
c. Thomson
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5. Calculate the number of all three subatomic particles in following atoms/isotopes:
a. Helium
c. Thorium-235 (Symbol is Th)
b. Tin
d. Carbon-13
e. 81
35𝑋
….
What element does this represent?
6. Answer the following questions about isotopes.
a. Write nuclear/nuclide notation for silicon-29.
b. Write the nuclear/nuclide notation for zinc-67.
c. Write the isotope-hyphen notation for 42
20𝐶𝑎
7. Calculate the atomic mass of Silicon. Show all work with units and provide your answer to 5
significant figures. Natural silicon consists of the following isotopes:
Isotope
Silicon-28
Mass, amu
27.977
Percent Abundance
92.23%
Silicon-29
28.976
4.67%
Silicon-30
29.974
3.10%
8. Answer the following half-life questions. Show work.
a. An original sample contained 600g. Currently, there is 150g remaining. How many halflives have passed?
b. An original sample contained 1000g. Currently there is 15.625g remaining. How much
time has passed if the half-life of the sample is 300 years?
9. Answer the following definition/concept problems thoroughly.
a. Show an alpha decay of Uranium-238.
b. Show a beta decay of Francium-227 (symbol = Fr).
c. Show a gamma ray emission from Plutonium-244 (symbol = Pu).
d. Show an electron capture for Carbon-14.
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