CP Chemistry
Name: _______________________________________ Date: _______________ Mods: __________
Chapter Three Review:
1. Match the following scientist with their experiment/contribution to atomic theory (some may be
used more than once):
a. John Dalton
_______1. First to believe there was a piece of matter
b. Ernest Rutherford
which would be indivisible
c. Robert Millikan
_______2. Oil drop experiment
d. JJ Thomson
_______3. Cathode ray tube experiment
e. Democritus
_______4. Atomic Theory which includes 3 Basic Laws
_______5. Gold Foil Experiment
________6. Credited with discovering the electron from his experiment results and the charge
to mass ratio of an electron
________7. Ancient Greek philosopher who idea about matter was lost for over 2000 years
________8. Had evidence that supported a model of the atom which has a small, dense,
positively charged center (nucleus).
________9. Incorrectly believed, and wrote in his theory, that the atom was indivisible
________10. Credited with calculating the charge of a single electron
________11. The first to propose atomic theory based on scientific evidence
________12. Hypothesized that the model of the atom was like “Plum Pudding” in that the
majority of the atom was a sphere of positive charge with small negative particles
spread evenly throughout it (like raisins in pudding). This resulted in an atom that
had an even mass and charge distribution throughout it.
________13. His model of the atom was the first to propose that the electrons were separate
from the positive charge of the atom (electrons outside of the nucleus) and that
the majority of the atom was empty space
pg. 1
2. a. What is the law of conservation of mass?
b. Rusting is a chemical reaction that takes place between the initial reactants Iron and
Oxygen to form a compound called iron (III) oxide, how can the law of conservation of mass
be applied to this particular reaction?
3. Pure compounds must have a constant composition anywhere in the world. If the compound
iron (III) oxide (Fe2O3) is consistently known to have 2 iron atoms combined with 3 oxygen
atoms, then what basic law is being described?
4. Use your periodic table to fill in the missing information in the chart below.
Symbol
Atomic
Number
Atomic
Mass
74
184
35
# neutrons
# electrons
45
196
Rb
# protons
118
78
85
7
7
pg. 2
5. Given the isotopic symbols below, and using you periodic table, fill in the missing information
in the chart below.
Symbol
112
48
198
79
137
56
Identity of Atom
(element)
Atomic
Mass
# protons
# neutrons
# electrons
?
?
?
Osmium-191
Argon- 40
Gold-196
6. What is the average atomic mass of Germanium off of the periodic table?
____________________________. Taking this into consideration, which isotope must be
more abundant in nature, 72Ge or 73Ge (assuming that these are its only two isotopes)?
Explain.
7. In nature, 20.3% of Boron exists as Boron-10 and the remainder is Boron-11. What is the
average atomic mass (to 3 decimal places) of Boron? Assume the isotopic masses are whole
numbers.
pg. 3
8. Determine the Molar Masses of the following elements. All answers should include the correct
units and be rounded to 1 decimal place.
a. Zinc: _______________________________________________
b. Manganese: _______________________________________________
c. Bismuth: _______________________________________________
d. Titanium: _______________________________________________
e. Phosphorous: _______________________________________________
f.
Tungsten: _______________________________________________
g. Tin: _______________________________________________
9. What is the value of Avogadro’s number, including the correct units?
The Mole Map:
Grams  Moles  Atoms
10. Using DIMENSIONAL ANALYSIS, complete the following molar conversions. Round all
answers to two decimal places and be sure to include the correct units AND the identity of the
substance in the final answer.
a. How many moles are there is 29.8 grams of Helium?
b. Calculate the number of atoms of Magnesium there are in 4.31 moles of Magnesium.
pg. 4
c. What is the mass, in grams, of 7.55 x 1025 atoms of Lithium?
d. How many moles are there in 37.0 grams of Carbon?
e. How many atoms are there in 3.64 grams of Chromium?
f. What is the mass of 1.85 moles of Chlorine?
pg. 5