1. Key
GENERAL CHEMISTRY-I (1411)
S.I. # 4
1. Which of the following is the same as 0.001 cm? A – 0.01 mm
a. 0.01 mm b. 100 mm c. 0.01 cm d. 0.01 dm e. 1 mm
2. Which is incorrectly labeled? C – 4.8x10-6 mL = 4.8 microliters
a. 2.3x10-12m = 2.3 pm
b. 5.8x10-9 s = 5.8 ns
c. 4.8x10-6 mL = 4.8 microliters
d. 4.8x103g = 4.8 kg
3. The common English set of units for expressing velocity is miles/hour. The SI
unit for velocity is _____m/s_____
4. If the mass of an object is 9.83 g, what volume must it have in order for it to sink
in liquid mercury? (density of mercury is 13.6 g/cm3) and 1ml=1cm3
(9.83g)(1 cm3 / 13.6 g) = 0.722 mL
5. Find the formula weight of the following:
a. C8H18 = 114 g
b. C4H9OCl = 108.5 g
c. BaSO4 = 233.34 g
d. UF6 = 352 g
e. C10H16N5O13P3 = 507 g
6. Find the number of moles present in:
a.15 g of NaN3 = 0.23 mol NaN3 (15 g NaN3)(1 mol NaN3/ 65g NaN3)=0.23mol
b. 75 g of BaOH = 0.49 mol BaOH (75gBaOH)(1mol BaOH/154.34g)=0.49 mol
c. 15 kg C6H12O6 = 83.3 mol (15kg)(103g/1kg)(1mol/180g) = 83.3 mol
7. Find the number of grams present in:
a.13mol CCl4 = 2002 g CCl4 (13 mol CCl4)(154g/1mol)= 2002 g CCl4
b. 35.3 mol CuPO4 = 5595 g CuPO4 (35.3mol)(158.5 g/ 1 mol)= 5595 g CuPO4
c. 29 mol of CeMnO4 = 7511 g CeMnO4 (29 mol)(259g / 1 mol) = 7511 g
CeMnO4
8. How many molecules are in 78 g of AgNO3?
(78g AgNO3)(1mol/170g AgNO3)(6.02x1023 molecules) = 2.8x1023 molecules AgNO3
9. How many fluorine atoms are there in 87,130 mg of UF6?
(87,130 mg UF6)(1g UF6/1,000mg UF6)(1mol UF6/352gUF6)(6.02x1023atoms F/1molUF6)
(6 atoms F) =
8.9x1023 atoms of F
2. Key
10. Write the empirical formula if it exists:
a. C12H20 C3H5
b. H8S8 HS
c. Na2N3O6 None – this is empirical formula
d. C18H21N6O3 C6H7N2O
e. S5F5O30 SFO6
f. C7H14O9 None – it is empirical formula
g. Li2P4O8 LiP2O4
11. Balance the following equations:
a. 2 KOH + __1__ SO2 ___1__ K2S + ___2__ O2 + ___1__ H2
b. __3 ZnCl2 + __2__ H3PO4 ___6__ HCl + ___1__ Zn3(PO4)2
c. __1 C8H16 + __12__ O2 ___8__ CO2 + ___8__ H2O
d. __1 Fe2O3 + __6__ HCl ___2__ FeCl3 + ___3__ H2O
e. __6 HF + __1__ Cu2O3 ___3__ H2O + ___2__ CuF3
NOMENCLATURE: Give the name or formula for the following
1. H2SO4- bisulfate ion
2. CaCl2 Calcium Chloride
3. Cu(ClO4)2 Copper(II) perchlorate or cupric perchlorate
4. Cr2O3 Chromium (II) oxide
5. CH4 Methane
6. C2H6 Ethane
7. C3H8 Propane
8. C4H10 Butane
9. C5H12 Pentane
10. C6H14 Hexane
11. C7H16 Heptane
12. C8H18 Octane
