Download Chemistry 1105 R11 Fall 2010

Chemistry 1105 R11
Fall 2010
Practice Exam 1
1. Perform the following calculations, expressing your answer with the right number of
significant figures:
(a) (4.986 x 10-3) x (4.9 x 10-8) =
(b) 3.27 – 2.9 + 18.09 =
(c) 6.399 x 10-2 + 6.35 x 10-3 =
2. Perform the following conversions:
(a) 5.4 x 10-1 kg
mg
µL
(b) 3.091 mL
(d) The distance from the earth to the sun, 93,000,000 miles, in meters
(1 mile = 1.61 km).
(e) 73 °C
Kelvin
5. Fill in the following table for neutral atoms:
Name
Symbol
Atomic
no.
Mass
no.
p
n
Nickel-60
32
P
38
40
14
6
14
14
Page 2
7. One red blood cell has a volume of about 100 femtolitres, and contains about 30 picograms of
hemoglobin. How many grams of hemoglobin are there per liter of red blood cells?
(pico = 10-12 femto = 10-15).
9. A sample of stainless steel has a density of 7.90 g cm-1. If a sheet of this stainless steel has a
mass of 1.00 kg and is 0.15 m on a side, what will be its thickness in mm?
11. Give systematic name or formulas for each of the following:
(a) Mn(NO3)2 __________________________
(b) S2Cl4 ______________________________
(c) (NH4)2SO2 __________________________
(d) KH2PO3 ___________________________
(e) Na2Cr2O7 . 3 H2O _________________________
(f) Lithium hypochlorite ______________
(g) Dintrogen tetraoxide ______________
(h) Copper (II) fluoride _______________
(i) Mercury (I) nitride _______________
(j) hypoiodic acid _______________
Page 3
Complete and balance the following equations, clearly showing the states of the products
formed. If no reaction occurs, write “No Reaction.”
a)
Pb(NO3)2 (aq) +
b)
K3PO4 (aq) +
c)
H2SO4 (aq)
d)
(NH4)2CO3 (aq) +
e)
Na2CO3 (s) +
Na2SO4 (aq)
MgCl2 (aq)
+
KOH (aq)
FeCl3 (aq)
HCl (aq)
For equation d) above, write the complete ionic equation:
For equation b) above, write the net ionic equation:
a) In the following unbalanced chemical equation, write the oxidation numbers of all the
elements present above the formulas:
Cl1- +
Sn (s) + NO31-
SnCl62- +
NO2
c) In the above reaction, ______ is oxidized and _____ is reduced.
d) In the above reaction, _____ is the oxidizing agent and _____ is the reducing agent.
b) Now balance the equation in aqueous acidic solution.