chem test tomorrow!!!?

Question

do u use prefixes in ionic compounds?
are molecular and covalent compounds the same?
when must parentheses be used in writing formulas?

Answer 1

Here are a few quick rules:

1) You recognize ionic compounds because they start with a metal (or NH4). Ionic compounds DO NOT use prefixes since they are always written in their empirical formula form.
BaF2 = barium fluoride
AlCl3 = aluminum chloride
Be sure the nonmetal you name ends in "ide" unless you name a polyatomic ion.

2) Molecular and covalent are the same for naming. These are all nonmetals. If you don't see a metal in the name or formula you know it must have PREFIXES to name the molecule.
CO = carbon monoxide
CO2 = carbon dioxide
PCl5 = phosphorus pentachloride
PCl3 = phosphorus trichloride
Make sure the last nonmetal ends in "ide."

Parentheses are used when writing an ionic formula which includes a polyatomic ion and you need to write a subscript after the polyatomic ion.

aluminum nitrate = Al 3+ and NO3 1- joined.

AlNO3 3 is too confusing and looks like 33 oxygen instead of 3 nitrate
Al(NO3)3 sets the nitrate apart from the added subscript to show that we need 3 nitrate ions.

Answer 2

I have a chem test tomorrow too!
No, don't use numeric prefixes (di-, tri-, etc) in ionic compounds. Molecular and covalent compounds are the same. Parentheses must be used around poly atomic molecules (like PH4) when there are more than one of them.
Good luck on your test!

Answer 3

I don't know what prefixes in ionic compnds means. IUPAC naminng is pretty straight forward follow the link.

molecular compunds are just molecules covalant is a bit more percise and talks about bonding covalent's counterpart are ionic but both are molecules.

parenthesis are used when you have multiple groups of things like hydroxyl groups (OH) so if you had a compund x with three hydroxyl groups it would look like x (OH)3

Answer 4

4. you like a answer of the two the acid or base you prefer to titrate and the acid or base of extensive-unfold concentration which you're using to titrate the answer of unknown concentration. you like a beaker, a buret, a buret stand, and phenolphthalein (or yet another indicator). If the beaker must be washed, it must be rinsed with the answer which you will placed into the beaker and not water so as that the answer would not get diluted. placed the answer being titrated in the buret and the different answer in the beaker & upload 3ish drops of the indicator to the beaker.

Answer 5

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