Thread: Chemistry help
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Old 10-16-2002, 03:46 PM   #1
Nanobyte
Thoth - Egyptian God of Wisdom
 

Join Date: March 1, 2001
Location: NC
Posts: 2,890
We took a quiz today on chemical equations and such in chemistry, and I'm wondering why I got a 70.. Here are the questions and my incorrect answers:

Write chemical equations for the following:

solid zinc sulfide + oxygen gas ---> solid zinc oxide + sulfurdioxide
(an unbalanced compound, S has charge of 2 and O has charge of 4)
ZnS + 3O --> ZnO + SOsubscrict2

hydrochloric acid + agueous magnesium hydroxide ---> aqueous magnesium chloride + water
?

Carbon tetrachloride is produced by reacting chlorine gas with methane gas (CHsubscript4). Hyrdrogen chloride gas is also formed in the RXN(reaction).
8Cl + CHsubscript4 --> CClsubscript4 + 4HCl

Phosphoric acid is produced through the reaction of tetraphosphorus decaoxide (an unbalanced compound, P has charge of 12 and O has charge of 20) and water.
5Psubscript4Osubscript10 + 3OHsubscript2O --> 2OHsubscript3POsubscript4

Those 4 are the ones I missed that I do not understand. Any help is appreciated.
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