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Worksheet 6
Supplemental Instruction
Iowa State University
Prina
Chem 177
Dr. Greenbowe
09/16/2014
1) Balance the following equations.
a)
Fe+
Cl2 →
FeCl3
b)
Fe+
O2 →
Fe2O3
c)
FeBr3+
d)
Na3PO4 + HCl →
H2SO4-> Fe2(SO4)3 + HBr
NaCl +
H3PO4
2) Write whether the following reactions are combination, decomposition or combustion
reaction.
Remember: A+B-> C (Combination reaction)
C->A+B (Decomposition reaction)
Combustion reactions occur when O2 is a reactant
a)
2Fe(s)+
3Cl2(g) →
2FeCl3(s)
b) 2Al (s) + 3Br2(g)-> 2AlBr3(s)
c) 2 H2O → 2 H2 + O2
d) 2Cl 2 O 5 ( g ) → 2Cl 2 ( g ) + 5O 2 ( g )
e) CaCO 3 ( s ) → CaO ( s ) + CO 2 ( g )
f) C10H8 (g) + 12 O2 (g)→ 10 CO2 (g)+ 4 H2O(g)
3) Find the Formula Weight of the following compounds. Also write down the name of the
compounds.
Remember formula weight is the sum of the atomic weights of atoms in the chemical
formula.
a) CH4
b) H3PO4
c) Mg(OH)2
d) KClO4
4) Write a balanced equation for when ethanol C2H5OH is burnt in air. (A good rule to
remember is that any compound containing C, H and O when combusted with O2 forms
CO2 and H2O)
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