Chemistry Unit 3

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What is the oxidation number of iodine in KIO4?

+7

An unknown element X can form a compound with the formula XBr3. In which group on the Periodic Table would element X be found?

13

What is the chemical formula for copper(II) hydroxide?

Cu(OH)2

Write the chemical formula of cuprite.

Cu2O

What is the chemical formula for iron(III) oxide?

Fe2O3

Which group on the Periodic Table of the Elements contains elements that react with oxygen to form compounds with the general formula X 20?

Group 1

In which substance does hydrogen have an oxidation number of zero?

H2

What is the IUPAC name for the compound FeS?

Iron (2) sulfide

What is the chemical formula for sodium sulfate?

Na2SO4

The chemical formula for nickel (II) bromide is

NiBr2

Which formula represents strontium phosphate?

Sr3(PO4)2

What is the formula of titanium(II) oxide?

TiO

What is the IUPAC name for the compound ZnO?

Zinc Oxide

What is the name of the polyatomic ion in the compound Na2O2?

peroxide

KCIO₃ >>> KCI(s) + O₂(g)

unbalanced 0=1+x-6 0=x-5 +5=x


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