Download Chemistry Unit 5 Test Review The Mole and Balancing Equations

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Block: _____ Date: _________________
Chemistry Unit 5 Test Review
The Mole and Balancing Equations
Pre-test:
1. What is the molar mass of the reactant of the reaction below?
2. Fluorescent lights are coated with several compounds that emit different colors. Y 2 O 3 produces
red light, CeMgAl 11 O 19 produces green light, and BaMgAl 10 O 17 produces blue light. What is the
percent composition by mass of aluminum in the compound that produces blue light in fluorescent
light?
3. Write and balance the equation sulfur dioxide and oxygen react to produce sulfur trioxide.
Review:
1. The percent by mass of oxygen in CO is approximately ___________
2. Which quantity is equivalent to 39 grams of LiF?
3. What is the mass in grams of 1.00 mole of O 2 gas?
4. What is the total number of moles contained in 115 grams of C 2 H5 OH?
5. What is the total mass in grams of 0.75 mole of SO 2 ?
6. Two alcohols that are used in our everyday lives are rubbing alcohol and ethylene glycol. Rubbing
alcohol is used as an antiseptic. Ethylene glycol is the main ingredient in antifreeze, which is used
in automobile cooling systems.
What is the molecular weight of ethylene glycol, C 2 H4 (OH) 2 ?
What is the percent mass of hydrogen in rubbing alcohol, C 2 H7 OH?
7. What is the number of moles in 80.0 grams of C 2 H5 Cl?
8. Rust on an automobile door contains Fe 2 O 3(s) . The balanced equation representing one of the
reactions between iron in the door of the automobile and oxygen in the atmosphere is given below.
4Fe (s) + O 2(g)  2Fe2O3(s)
Determine the molar mass of the product of this reaction.
9. Determine the mass of 5.20 moles of C6H12.
10. Ethene and hydrogen and react as a faster rate in the presence of the catalyst platinum. The
equation below represents a reaction between ethane and hydrogen.
Determine the molar mass of the product.
11. When the equation N2 + H2  NH3 is completely balanced, what is the sum of the coefficients?
12. Balance the equation ____Ba(NO3)2 + ____(NH4)2SO4  ____BaSO4 + ____NH4NO3.
13. Balance the equation ____CH4 + ____O2  ____CO2 + ____H2O.
14. Balance the equation ____Ba + ____HCl  ____BaCl2 + ____H2.
For the next 5 questions, write and balance the chemical equation.
15. Calcium metal reacts with nitrogen gas to produce calcium nitride.
16. Nickel metal reacts with sulfuric acid to produce nickel (II) sulfate solution, oxygen gas, and
water. (The coefficient for sulfuric acid will be 2)
17. Potassium phosphate reacts with barium carbonate to produce potassium carbonate and barium
phosphate.
18. Iron (II) chloride reacts with cobalt (IV) oxide to produce iron (II) oxide and cobalt (IV) chloride.
19. Nickel (III) sulfide reacts with nitric acid to produce hydrosulfuric acid and nickel (III) nitrate.
20. For the reaction magnesium nitrite and lithium hydroxide react to produce magnesium hydroxide
and lithium nitrite complete the following:
a. Write and balance the equation
b. Calculate the molar mass of magnesium hydroxide
c. Calculate the molar mass of lithium nitrite.
d. Convert 8.6 moles of magnesium hydroxide to grams of magnesium hydroxide.
e. Convert 0.62 grams of magnesium hydroxide to moles of magnesium hydroxide.
f. Convert 172 g of lithium nitrite to moles of lithium nitrite.
g. Convert 6.1 moles of lithium nitrite to grams of lithium nitrite.