note: all numbers used below are subscripts.
Write chemical equations for the following:
solid zinc sulfide + oxygen gas ---> solid zinc oxide + sulfurdioxide
2ZnS + 3O2 --> 2ZnO + 2SO2
hydrochloric acid + agueous magnesium hydroxide ---> aqueous magnesium chloride + water
2HCl + Mg(OH)2 --> MgCl2 + 2H20
Carbon tetrachloride is produced by reacting chlorine gas with methane gas. Hyrdrogen chloride gas is also formed in the reaction.
4Cl2 + CH4 --> CCl4 + 4HCl
Phosphoric acid is produced through the reaction of tetraphosphorus decaoxide and water.
P4O10 + 6H2O --> 4H3PO4
Quote:
Originally posted by Nanobyte:
Those 4 are the ones I missed that I do not understand. Any help is appreciated.
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It all comes down to simply counting ions on each side. Always start with the non-elemental ions first, then adjust the elements and the water to balance hydrogens and oxygens.
Oxygen gas is always represented in equations as O2; two atoms share two electron pairs. Chlorine gas is Cl2; two atoms share one electron pair.