Test #3 & 4 Example

Part I:  Write the balanced equation for each of the following situations.  Describe the reaction type by writing the letter of the reaction type in the space provided on the answer key.   Identify the limiting reactant (if any) and determine the grams of each resulting product.

       Reaction Type Key:  
a.        Combination Reaction
b.        Decomposition Reaction
c.        Oxidation Reduction Reaction
d.        Precipitation Reaction
e.        Gaseous Reaction 
f.         Neutralization Reaction
g.        Combustion Reaction

1.  3.02 g of potassium chlorate is heated to form potassium chloride and oxygen

2.  61.8 g of nitrogen gas is reacted with 61.8 g of hydrogen gas to form ammonia

3.  1.839 g of calcium hydroxide is reacted with a solution of sulfuric acid

4.  0.0123 g strip of zinc is dropped into a test tube of hydrochloric acid

5.  2.11 g of hydrogen peroxide decomposes in the presence of manganese dioxide to form water and oxygen

6.  8.9 g of copper(II) sulfate, pentahydrate is heated to drive off the water of hydration

7.  A 4.32 g sample of methane burns in excess oxygen

8.  5.92 g of sodium oxalate is reacted with 6.76 g of calcium chloride

9.  3.33 g of barium chloride is reacted with 3.34 g of sulfuric acid

10. 1.29 g of sodium chloride is reacted with 3.94 g of silver nitrate

11.  3.5 g of barium nitrate is reacted with 1.222 g of sodium sulfate

12.  1.3 g strip lithium reacts with 3.3 g of magnesium nitrate

13.  6.9 g sodium nitride forms sodium and nitrogen gas

14.  3.5 g silver nitrate reacts with 3.9 g of aluminum

15.  1.95 g iron(III) chloride and 2.35 g of sodium hydroxide

Part II: Determine the percent composition of each element in the following compounds.

1.  lithium nitride, pentahydrate

2.  sodium phosphate

3.  cesium oxide

4.  calcium permanganate

5.  iron(III) nitrate, hexahydrate

 

ANSWER SHEET

Part I:  Balancing Equations

1.  Balanced Equation
_____________________________________________________________________________________                                                                                                                                   Reaction Type________                                               Limiting Reactant _____________________________
Grams of Product (List the Product and the Amount)
_____________________________________________________________________________________

2.  Balanced Equation _____________________________________________________________________________________                                                                                                                                   Reaction Type________                                               Limiting Reactant _____________________________
Grams of Product (List the Product and the Amount)
_____________________________________________________________________________________

3.  Balanced Equation _____________________________________________________________________________________                                                                                                                                   Reaction Type________                                               Limiting Reactant _____________________________
Grams of Product (List the Product and the Amount)
_____________________________________________________________________________________

4.  Balanced Equation _____________________________________________________________________________________                                                                                                                                   Reaction Type________                                               Limiting Reactant _____________________________
Grams of Product (List the Product and the Amount)
_____________________________________________________________________________________

5.  Balanced Equation _____________________________________________________________________________________                                                                                                                                   Reaction Type________                                               Limiting Reactant _____________________________
Grams of Product (List the Product and the Amount)
_____________________________________________________________________________________

6.  Balanced Equation _____________________________________________________________________________________                                                                                                                                   Reaction Type________                                               Limiting Reactant _____________________________
Grams of Product (List the Product and the Amount)
_____________________________________________________________________________________

7.  Balanced Equation _____________________________________________________________________________________                                                                                                                                   Reaction Type________                                               Limiting Reactant _____________________________
Grams of Product (List the Product and the Amount)
_____________________________________________________________________________________

8.  Balanced Equation _____________________________________________________________________________________                                                                                                                                   Reaction Type________                                               Limiting Reactant _____________________________
Grams of Product (List the Product and the Amount)
_____________________________________________________________________________________

9.  Balanced Equation _____________________________________________________________________________________                                                                                                                                   Reaction Type________                                               Limiting Reactant _____________________________
Grams of Product (List the Product and the Amount)
_____________________________________________________________________________________

10. Balanced Equation _____________________________________________________________________________________                                                                                                                                   Reaction Type________                                               Limiting Reactant _____________________________
Grams of Product (List the Product and the Amount)
_____________________________________________________________________________________

11. Balanced Equation _____________________________________________________________________________________                                                                                                                                   Reaction Type________                                               Limiting Reactant _____________________________
Grams of Product (List the Product and the Amount)
_____________________________________________________________________________________

12. Balanced Equation _____________________________________________________________________________________                                                                                                                                   Reaction Type________                                               Limiting Reactant _____________________________
Grams of Product (List the Product and the Amount)
_____________________________________________________________________________________

13. Balanced Equation _____________________________________________________________________________________                                                                                                                                   Reaction Type________                                               Limiting Reactant _____________________________
Grams of Product (List the Product and the Amount)
_____________________________________________________________________________________

14. Balanced Equation _____________________________________________________________________________________                                                                                                                                   Reaction Type________                                               Limiting Reactant _____________________________
Grams of Product (List the Product and the Amount)
_____________________________________________________________________________________

15. Balanced Equation _____________________________________________________________________________________                                                                                                                                   Reaction Type________                                               Limiting Reactant _____________________________
Grams of Product (List the Product and the Amount)
_____________________________________________________________________________________

 

Part II: Percent Composition

1.  Li____________,  N______________, H_______________, O______________

2.  Na____________, P_______________, O________________

3.  Cs____________, O_______________

4.  Ca____________, Mn______________, O_______________

5.  Fe_____________, N_______________, O______________, H_______________

 

Directions:  Use Scantron 882-ES only.  Mark all answers using a #2 pencil and erase all errors completely.  GOOD LUCK!!!

 

 

  1. When 0.50 grams of calcium metal is added to an excess amount of water, how much gas is produced?
    1. 0.025 g
    2. 0.050 g
    3. 0.10 g
    4. 0.50g
    5. None of the above

 

  1. What type of reaction is described above?

a.       Neutralization

b.       Precipitation

c.       Combustion

d.       Combination

e.       Single replacement

 

  1. Calculate the frequency of energy of  3.50 x 10-14 joules. (h = 6.63 x 10 -34 joule s).
    1. 1.89 x 10-20 Hz
    2. 5.68 x 10-12 Hz
    3. 1.58 x 10-28 Hz
    4. 1.76 x 1011 Hz
    5. 5.28 x 1019 Hz

 

  1. What is the electron configuration corresponding to the following orbital diagram:   ­¯   ­¯   ­_

 

    1. 1s2  2s2 2p1
    2. p5
    3. 1s2 2s2  3s1
    4. d5
    5. None of the above is correct.

 

  1. Sodium metal reacts with water to form (you know, but think about it closely).  What is the limiting reactant if 100.0 g of sodium is reacted with 4.00 moles of water?
    1. Water
    2. Sodium
    3. Hydrogen gas
    4. Oxygen
    5. Can not be determined

 

  1. What is the volume of 12.0 g of an alcohol whose density is 0.920 grams/milliliter?
    1. 12.0 mL
    2. 0.0767 mL
    3. 11.0 mL
    4. 13.0 mL
    5. 76.7 mL

 

  1. When the equation is balanced, the coefficient for the salt on the product side is:

 

Sodium cyanide reacts with sulfuric acid to form (you know)

    1. 1
    2. 2
    3. 3
    4. 4
    5. 0

 

  1. The chemical treatment of zinc sulfide with oxygen gives zinc oxide and sulfur dioxide gas.  Suppose that 7.50 g of zinc oxide was recovered when 10.0 g of zinc sulfide is reacted with 10.0 g of oxygen.  What is the percent yield?

a.  89.4%          b.  95.2%          c.  21.6%          d.  33.3%          e.  None of the above

 

  1. How many grams of oxygen are required to produce 100. g of sulfur dioxide?

           

iron (III) sulfide   +  oxygen  ®   ferric oxide +  sulfur dioxide

 

            a.  36.3                         b.  49.9             c.  68.7             d.  98.5             e.  none of the above

 

 

 

Free Response: 

Directions:  Show all of your work, or you get 0 points.  Place your final answer in the space provided.

 

 

  1. Ammonia gas reacts with fluorine gas to form dinitrogen tetrafluoride gas and hydrogen fluoride.  Write the balanced chemical equation.

___________________________________________________________________________________________

 

 

 

  1. Glucose is the most prevalent monosaccharide in our diet, C6H12O6.  Compute the mass percent of each element in glucose.

% C_________________   %H___________________%O_____________________

 

 

 

Table I:  Significant Figures

Directions:  Complete the following equation.  Remember to record the units. 

Problem

Show work in space provided in this section.

Answer in Scientific Notation

11 mm  X  8 cm  X  0. 093 mm

 

 

 

 

(19.350 x 109 –  12.7 x 108)

            700. x 10¯2

 

 

 

 

How many cubic nanometers are in 7.28 x 109 femtoliters?

 

 

 

 

 

 

 

 

 

Table II:  Electron Configuration 

Atom or Ion

Complete Electron Configuration

Abbreviated Orbital Diagram

 Valence Electron
Configuration

Barium ion

 

 

 

  

Fluoride ion

 

 

 

  

Cesium ion

 

 

 

  

Silicon atom

 

 

 

  

Selenide ion

 

 

 

  

 

 

 

 

Table III:  Reactions

Directions:  Write the balanced equation for the following reactions.  Use only the following descriptions:  neutralization, precipitation, gaseous, combustion, synthesis, single displacement or decomposition ONLY.

Reaction

Balance Equation

( place states on the products only)

Description

Hydroiodic acid reacts with aqueous calcium hydroxide

 

 

 

 

 

Aqueous silver nitrate reacts with magnesium metal

 

 

Pentane (aq) (C5H12) burns

 

 

 

Aqueous lithium hydrogen carbonate reacts with nitric acid

 

 

 

Gaseous chlorine is reacted with aqueous sodium iodide

 

 

 

 

Aqueous lithium sulfate reacts with aqueous barium nitrate

 

 

Aqueous potassium hydroxide is placed in a beaker containing phosphoric acid

 

 

Aqueous sodium chloride is placed in a beaker of aqueous silver nitrate

 

 

Aqueous zinc chloride is placed in a beaker with aqueous ammonium sulfide