Chemistry Compound Project

Davide Della Libera, Nadja Ganter, Andrea Susnik and Kelsey Lee

Monovalent Compounds

O Monovalent Compounds are compounds that have only one ionic charge, which means they have one valence electron to form a ionic bond with some other elements or compounds. We can also recognise them because in the periodic table, they are those which have only a + or – in their top right. For example:

Bisulfate (hydrogen sulfate) HSO4-

Multivalent

CompoundsMultivalent Compounds are ionic compound metals with

different numbers of electrons, having more than

one valence. They are located in the large middle section of

the periodic table (demonstrated to the bottom

left). Because they are multivalent, they can be seen

with up to 3 possible ionic charges that are positive, because they are metals.

Ex.

O Since a multivalent compound can form more than one stable icon, to determine whether a compound is multivalent or not we must look at the periodic table to see if the metal has more than one combining capacity.

O You can also usually determine the combining capacity of the metal by looking at the formula if the compound by looking at the formula of the compound: by un-criss crossing the value (looking at the other element’s value)

O When writing out a multivalent compound, clarify it’s capacity by it placing in brackets, in roman numerals.

ex. Nickel (III), Manganese (IV).

Polyatomic compounds

O Polyatomic ions comprised of more than one atom, which share the electrons.O Examples for polyatomic ions:

O Positive ions: Ammonium NH4+O Negative ions: hydroxide OH-

From Formula to Name

O Write positive ions name either metal or ammonium

O Check if metal is multivalent ion, if so indicate multivalent ions charge in roman numerals

O Indentify negative ion and name itO Ex: Cr3 (Po4) 2

O chromateO Chromate (||)O Chromate (||) phosphate

From name to formula

O Identify each ion and its chargeO Criss Cross chargesO Put Symbole together and get rid of

charge values. For Polyatomic ions, use brackets around the ion

O Example: O Chromium (|||) (Cr3+) Sulphate (SO4

-2)

O Cr3+ SO42-

O Cr2 (SO4) 3

HydratesO A solid compound that is

surrounded by water molecules.

OCopper sulfate pentahydrate

How to name it!?O Steps to naming Hydrates

O Name the compound as you would normally do so.

O After the compound name, place the corresponding prefix(# of water molecules)in front of the word hydrate.

Prefixes

O Ex. O FeSO4 5H2O= Iron(II) sulphate

pentahydrateO NiSO4 7H2O= Nickel sulphate

heptahydrateO Co3(PO4)2 8H2O= Cobalt(II) phosphate

octahydrate