APPLIED CHEMISTRY

MIDTERM PROBLEMS REVIEW

QUESTION 1

What is the atomic number and chemical

symbol for osmium?

QUESTION 2

Which is larger?

milligram milligram

hectogram hectogram

kilogram kilogram

decigram 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

Protons Electrons

Cu+1

Cu+2

Protons Electrons

Cu+1

Cu+2

GROUP 1 GROUP 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 _____ 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.

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?