Chem 2 Midterm Review Questions Page 2
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25. (13 TT) Balance and complete the overall reactions, then give the net ionic reactions for each
of the following reactions:
a. H
SO
+ Ba(NO
)
→
2
4 (aq)
3
2 (aq)
b. NH
OH
+ Cu(NO
)
→
4
(aq)
3
2 (aq)
c. K
CrO
+ Ba(NO
)
→
2
4 (aq)
3
2 (aq)
d. Fe(NO
)
+ KSCN
→
3
2 (aq)
(aq)
e. Na
S
+ SnCl
→
2
(aq)
2 (aq)
f. K
C
O
+ Ba(NO
)
→
2
2
4 (aq)
3
2 (aq)
g. H
SO
+ Na
S
→
2
4 (aq)
2
(aq)
6. (D.A.) Unit conversions:
a. (1) We have a measured mass of mercury (2.00g) and a density of mercury
(13.6g/ml). Solve for the volume in liters.
b. (1) How many weeks did it take you to read Lord of the Rings, if it took you 302,400
seconds to read it.
c. (2) Find the number of moles of 100.0 grams of Cu(NO
)
.
3
2
d. (2) Find the mass of 1.25 moles of C
H
.
4
10
e. (3) Determine the percent composition of C
H
.
4
10
7. (S.F) Scientific (a.k.a. Exponential) Notation and Significant Figures:
a. Convert to scientific notation 0.08206
1
b. What is the numerical value of 3.000 x 10
?
c. How many significant figures are there in the number 0.030100 ?
d. Write 0.0654234 to 3 significant figures.
e. Using the correct number of significant figures, what is the answer to
3.67 kg + 12.498 kg?
f. Using the correct number of significant figures, what is the answer when 5.18 is
multiplied by 4.2 ?
8. Safety and General Information:
a. In case of emergency, you may call the MS&T campus police at what number?
b. What is proper attire to wear in the lab?
c. In case you spill 3M HCl, what will the TA use to neutralize the spill?
d. If you break an empty beaker in the lab, what should you do?
e. What is the most important reason that you not eat or drink in the lab?
f. Why is it important that separate waste containers are used for each experiment?
g. Give examples of qualitative vs. quantitative observations.
h. What is the difference between a homogeneous and a heterogeneous mixture?
Give an example of each.
i. What are some physical properties of oxygen? What are some chemical properties?
j. What are some indications that a chemical reaction has occurred?
k. What is the main hazard of a reaction where hydrogen gas is produced?
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