TOTAL POSSIBLE = 100

A = 100-90
B = 89-80
C = 79-70
D = 69-60
F = 59-0 /

Name: ______

Block #: ______Date: ______

No Excuses

CHEMISTRY EXAM #2

OLD STUFF

  1. How much was the lab fee? ______(2pts)
  2. Use the grid to graph the data on the left. Please make sure you label the graph. (10pts)

Object Mass (g)

/

Object Volume (mL)

0 / 0
5 / 40
10 / 82
15 / 100
30 / 185
50 / 350
/

NEW STUFF

Multiple Choice: Please select the single best answer in each of the following (3pts each)

  1. An anion:
a)Has a positive charge
b)Has a negative charge
c)Has a neutral charge
d)Has a variable charge
e)None of the above /
  1. Which of the pairs represent the empirical and molecular formulas respectively?:
a)CH4 and CH4
b)CH and C6H6
c)CH2 and C2H2
d)CH2 and C2H3
e)CH2 and C3H6
  1. What is the correct molecular formula for 1 formula unit of Methane?
a)C7H14
b)C7H16
c)C7H18
d) CH2
e)None of the above /
  1. Which type of reaction would be like couples at a prom switching dates?
a)Synthesis
b)Decomposition
c)Single Displacement
d)Double Displacement
e)All of the above
f)None of the above
  1. Write the formula for each of the following compounds (2 pts each)

a. Sodium Chloride / b. Ammonium Oxide
c. Lead (IV) Phosphate / d. AluminumSulfate
  1. Write the compound name for the following formulas (2 pts each)

a. Ba(OH)2 / b. SrSO4
c. H2O2 / d. Hg2O

Balance the following problems (3 pts each):

  1. Na + Pb2(CrO4)4 Na2CrO4 + Pb
  1. BCl3 + P4+ H2 BP + HCl

Write and balance the following problems (6 pts each):

  1. Brooke, dropped barium metal in hydrochloric acid. The reaction produced barium chloride and hydrogen gas.
  1. Shawn mixed together aluminum nitrite with silver chloride to produce aluminum chloride and silver nitrate.

Please identify each of the five types of reactions that follow (2pts each)

# / Sample Reaction (unbalanced) / Type of Reaction
NaBr + O2 Na2O + Br2
Ca + Br2 CaBr
C2H6 + O2 CO2 + H2O

Write the balanced equation for each of the following reactions:

  1. Brookeuses energy to break apartsodium chloride. (8 pts).
  1. Saianamixes together silver nitrate with sodium iodide (8 pts).
ESSAY QUESTIONS—PICK 2…YOUR CHOICE. (10pts each)
  1. When writing binary formulas, the crisscross method always works. Using any example, explain howand why the crisscross method works. Also, explain why the formation of the compound oxide argonite would be a very unlikely. (10 pts).
  2. A student tries to balance this reaction:

Copper (III) Sulfide + oxygen 

They come up with:

2Cu2S3 + 4O  4CuO + 3S2

What is wrong (if anything) with their answer? Please explain. (10 pts)

INSURANCE POINTS…to be added onto your exam total…they can’t hurt you! (2pts each)

What is the definition of osculate?: ______

What element do people “seed” clouds with? ______

1