APPLIED CHEMISTRY
MIDTERM PROBLEMS
REVIEW
QUESTION 1
What is the atomic number and chemical
symbol for osmium?
QUESTION 2
Which is larger?
milligram
hectogram
kilogram
decigram
milligram
hectogram
kilogram
decigram
QUESTION 3
How many centiseconds are in a second?
QUESTION 4
Write 0.0005321 in scientific notation.
QUESTION 5
Write 2.33 x 105 in regular notation.
QUESTION 6
Fill in the table
GROUP 1
Protons Electrons
GROUP 2
Protons Electrons
Cu+1
Cu+1
Cu+2
Cu+2
QUESTION 7
How many oxygen atoms are in the
compound Ca(C2H3O2)2?
QUESTION 8
What is the molar mass of Mg(OH)2?
QUESTION 9
How many grams of carbon dioxide are in 1
mole of carbon dioxide?
QUESTION 10
How many moles are in 123 grams of lead
metal?
QUESTION 11
How many moles are in 6.02 x 1023
molecules of N2?
QUESTION 12
Balance this chemical equation:
___P4 +___O2 ___P2O5
___P4 +___O2 ___P2O5
QUESTION 13
In the equation
2Fe2O3 + 3CO  4H2O + 3CO2
_____ moles of iron(III) oxide
react with carbon monoxide
to form ___ moles of water
and ____ moles of carbon
dioxide.
_____ moles of iron(III) oxide
react with carbon monoxide
to form ___ moles of water
and ____ moles of carbon
dioxide.
QUESTION 14
A toy car has a mass of 15 grams. How
many pounds is this if 1 lb = 454 g?
QUESTION 15
A recipe calls for 2.50 L of milk. How many
gallons is this if 1 L = 1.06 qt and 1 gallon =
4 qts?
QUESTION 16
A piece of metal has the following dimensions:
length = 1.25 cm; width = 1.00 cm; height = 2.34 cm.
The mass of the metal is 26.2 g. If density=mass/volume,
what is the density of the metal?
QUESTION 17
What is the percent composition by mass of
oxygen in AlPO4?
QUESTION 18
When sodium phosphate, Na3PO4, reacts with barium
chloride, BaCl2, the products are barium phosphate,
Ba3(PO4)2, and sodium chloride, NaCl. Write the
balanced chemical equation for this reaction.
QUESTION 19
According to this equation:
2Na3PO4 + 3BaCl2  Ba3(PO4)2 + 6NaCl
How many moles of barium chloride are necessary to
produce 1.25 moles of barium phosphate?
QUESTION 20
How many grams are in 0.765 mole of
copper(II) sulfate, CuSO4?