APPLIED CHEMISTRY MIDTERM PROBLEMS REVIEW. QUESTION 1 What is the atomic number and chemical symbol...
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Transcript of APPLIED CHEMISTRY MIDTERM PROBLEMS REVIEW. QUESTION 1 What is the atomic number and chemical symbol...
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APPLIED CHEMISTRY
MIDTERM PROBLEMS REVIEW
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QUESTION 1
What is the atomic number and chemical
symbol for osmium?
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QUESTION 2
Which is larger?
milligram milligram
hectogram hectogram
kilogram kilogram
decigram decigram
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QUESTION 3
How many centiseconds are in a second?
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QUESTION 4
Write 0.0005321 in scientific notation.
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QUESTION 5
Write 2.33 x 105 in regular notation.
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QUESTION 6
Fill in the table
Protons Electrons
Cu+1
Cu+2
Protons Electrons
Cu+1
Cu+2
GROUP 1 GROUP 2
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QUESTION 7
How many oxygen atoms are in the compound Ca(C2H3O2)2?
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QUESTION 8
What is the molar mass of Mg(OH)2?
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QUESTION 9
How many grams of carbon dioxide are in 1 mole of carbon dioxide?
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QUESTION 10
How many moles are in 123 grams of lead
metal?
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QUESTION 11
How many moles are in 6.02 x 1023
molecules of N2?
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QUESTION 12
Balance this chemical equation:
___P4 +___O2 ___P2O5 ___P4 +___O2 ___P2O5
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QUESTION 13
In the equation
2Fe2O3 + 3CO 4H2O + 3CO2
_____ moles of iron(III) oxide _____ moles of iron(III) oxide
react with carbon monoxide react with carbon monoxide
to form ___ moles of water to form ___ moles of water
and ____ moles of carbon and ____ moles of carbon
dioxide. dioxide.
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QUESTION 14
A toy car has a mass of 15 grams. How many pounds is this if 1 lb = 454 g?
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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?
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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?
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QUESTION 17
What is the percent composition by mass of
oxygen in AlPO4?
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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.
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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?
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QUESTION 20
How many grams are in 0.765 mole of
copper(II) sulfate, CuSO4?