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Homework 5 due Monday Nov. 7
CHE 108 Fall 04
name:____________________
score____________________
____1) Equal parts (by weight) of sulfur (S) and oxygen (O2) can be reacted to give a single
product, SO2. If 2 parts of sulfur are reacted with 3 parts oxygen to yield a single product, what is
the formula of that product?
(a) SO
(b) SO2
(c) S2O3
(d) SO3
____2). Which of the following reactions is inconsistent with the atomic theory?
(a) Cu + Cl2 ---> CuCl2
(b) FeBr3 + AlCl3 ---> AlBr3 + FeCl3
(c) NaBr + AgNO3 ---> AgBr + NaNO3
(d) 3 KBr + AlCl3 ---> AlBr3 + 3PBr
(e) 2 H2O2 ---> 2 H2O + O2
___3) What is the chemical formula for a molecule made of 6 atoms of carbon, 4 atoms of H,
and 2 atoms of oxygen?
(a) C6H4O2
(b) 6C4H2O
(c) C6 + H4 + O2
(d) 6C+4H+2O
____4) Which element is not paired correctly with its oxidation number in the given species?
(a) The oxidation number of sulfur is -2 in Na2S.
(b) The oxidation number of oxygen is 0 in O3.
(c) The oxidation number of fluorine is -1 in AlF3.
(d) The oxidation number of calcium is -2 in CaCl2
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___5). Which of the following combinations of C, H2, and O2 does not show the correct
proportions to form C2H4O?
(a) 8C + 8H2 + 2O2
(b) 4C + 4H2 + O2
(c) 12C + 12H2 + 3O2
(d) 2C + 4H2 + O2
(e) 16C + 16H2 + 4O2
___6). The formation of chemical bonds involves the sharing of ________ between two atoms.
(a) alpha particles
(b) protons
(c) neutrons
(d) nuclei
(e) electrons
___7) Formula weight is the sum of atomic weights in a chemical formula.
(a) True
(b) False
8). Determine the Formula mass of the following compounds in amu
a. P2O3
b. Ba(NO3)2
c. Ammonium Sulfate
d. Calcium bicarbonate
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9) Balance the following equations
(a) ____Sn + ____NaOH  ____Na2SnO2 + ____H2
(b) ____Al + ____Fe3O4  ____Al2O3 + ____Fe
(c) ____CH3OH + ____O2  ____CO2 + ____H2O
(d) ____PCl5 + ____H2O  ____H3PO4 + ____HCl
(e) ____KBr + ____Cl2  ____KCl + ____Br2
(f) ____Cu(NO3)2  ____CuO + ____NO2 + ____O2
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(g) ____CaCl2 +____ Na2CO3  ____CaCO3 + ____NaCl
(h) ____P4 + ____Br2  ____PBr3
(i) ____C2H5SH + ____O2  ____CO2+ ____H2O + ____SO2
10) Solid aluminum metal reacts with liquid bromine, giving solid aluminum bromide. Write a
balance equation for the reaction using complete formulas for the compounds with state of matter
labels.
11) Solid calcium phosphate and aqueous sulfuric acid solution react to give calcium sulfate
precipitate. The other product is phosphoric acid, which remains in solution. Write a balance
equation for the reaction using complete formulas for the compounds with state of matter labels.