Unit 2 Review
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13.
What element/ion? What is the difference between an anion and a cation?? How do you make these?
a. P = 10, N = 10, e = 10
d. P = 26, N = 29, e = 26
b. P = 12, N = 12, e = 10
e. P = 19, N =20, e = 18
c. P = 92, N = 146, e = 92
f. P = 42, N = 54, e = 42
Where are the metals on the table? Metalloids? Nonmetals?
Where are the alkali metals, alkaline earth metals, halogens, noble gases?
What is the difference between ions and isotopes? What changes? Can you change the number of protons?
Why or why not?
What charges / number of valence electrons do each of the main groups have? (the predictable ones) – how
do you make these and why? (hint: octet)
Convert:
a. 5.0 g He to atoms He
b. 5.0 g He to atoms Ne
c. 5.0 g He to atoms Ar
d. 5.0 g He to atoms Mg
What charges do protons, electrons, and neutrons have? Where are each located?
What group on the table is most reactive, why? Which is second most (what do you think, why). Which
one is not at all reactive? Why?
What is Dalton’s Atomic Theory? What do the “rules” state about the atom?
Metals will typically form ____________________ (which ion) and nonmetals will form _____________.
What is an ionic compound vs a covalent molecule? Think about nomenclature… how can you make each
and be sure you are able to identify them as molecules or compounds.
Convert:
a. 425 grams Fe to moles of iron
b. 25.6 grams magnesium to moles magnesium
c. 2.01 moles gold to atoms of gold
d. 8544 mg of sodium to moles sodium
e. 0.0098 kg Mn to atoms Mn
f. 4.03x1024 molcules CO2 to grams CO2
g. 82.3 grams iron(II)oxide to compounds iron(II)oxide (why is this “compounds” and not
“molecules”
Calculate the average atomic mass of the following two problems:
a.
b.
14. What is the Law of Conservation of Mass? If 10.9 grams of A react with 5.4 grams of B what mass of C
will be formed?
A+BC
15. Short Answer:
a. What is a mass spectrometer? How does it work? What does it do?
b. What is an AMU and what does it represent?
c. Why doesn’t a mass spectrum of chlorine have a peak at 35.453amu?
d. What is periodicity? How does it help to explain properties (chemical and physical) on the
periodic table?
e. Why do elements in the same groups have similar properties?
f. Describe the atom according to the “steps” along the path that lead to the modern day atomic
model
g. What is the “modern day model” -- what does it look like? What shape, structure, make-up does
it have?
16. Nomenclature AND molar mass calculations:
Name / Formula
CaO
Li2S
NO2
sodium nitrate
aluminum chloride
SiO2
dinitrogen trioxide
aluminum carbonate
nitrogen trichloride
SF6
Be(OH)2
potassium iodide
MgBr2
magnesium oxide
NH3
aluminum oxide
phosphorus pentafluoride
sodium cyanide
oxygen difluoride
carbon disulfide
diboron tetrahydride
nitrogen monoxide
Molar Mass (g/mol)
Compound or
Molecule?