Chem 2C Worksheet (Main Group)
Reactions
Write chemical equations to represent each of the following. Identify the type of reaction.
(a) reaction of cesium metal with chlorine gas
2Cs + Cl2 -> 2CsCl, combination
(b) formation of sodium peroxide from reactants in elemental form
2Na + O2 -> Na2O2 , combination
(c) reaction of magnesium and bromine gas
Mg + Br2 -> MgBr2 , combination
(d) reaction of calcium with nitrogen gas followed by additional step of water workup.
Ca + N2 -> CaN2, CaN2 + H2O -> Ca + N2 + H2O, combination and decomposition
(e) combustion of potassium to form potassium superoxide
K + O2 -> KO2 , combination
(f) combustion of lithium metal in oxygen gas
Li + O2 -> 2Li2O , combination
(g) reaction of concentrated aqueous H2SO4 on KCl(s)
H2SO4 + 2KCl -> K2SO4 + 2HCl
(h) lithium metal heated in the presence of hydrogen gas and subsequently treated with
water
Li + H2 -> LiH2, LiH2 + H2O -> Li + H2O + H2, combination + decomposition
(i) production of titanium metal throu the reduction of titanium(IV) chloride with
sodium metal
TiCl4 + Na -> NaCl + Ti, single replacement
Lewis Structures
Predict the geometric structures of (a) BrF3; (b) IF5; (c) Cl3IF–. Find the ox state of the
central atom.
a) Trigonal bipyramidal, Br = +3
b) Square pyramidal, I = +5
c) Square planar: I = +3
Which of the following species has a linear structure: ClF2+, IBrF–, OCl2, ClF3 or SF4? (Central
atom underlined.) Do any of these species have the same structure?
IBrF- is linear. ClF2+ and OCl2 have same structure.
Draw the Lewis structures. Use VSEPR theory to predict the probable geometric structures
of the molecules. Find the oxidation state of the Xe atom for each molecule.
(a) XeO2F2
(b) XeO3F2
(c) XeF4O
Inert Pair Effect
Predict the most likely common charges for each of the following elements.
(a) Al +3
(b) Pb +2, +4
(c) Sb -3, +5, +3
(d) P -3, +5, +3
(e) Bi, +5, +3