2.5 Quiz/Test

Question 1

Answer 1

Hardest part is identifying that is is a covalent compound

Sulfur Tetrafluride
* remember in these the first element never gets the prefix mono while the second will - thats the hardest thing to remember about covlanet compounds

Question 2

Answer 2

Have to know this is an ionic compound because it has OH- in

OH- carries a negative 1 charge while Ba carries a +2 charge, meaning we need to double up the polyatomic ion

Ba(OH)2
* brackets just mean that that entire part is the part we have 2 of

Question 3

Answer 3

Question 4

Answer 4

The key is knowing that Ag always carries a +1 charge

This is an ionic compound because Ag = metal and S = non metal

Ag+1
S-2

Ag2S
* need 2 Ag’s to balence that -2 charge in S

Question 5

Missed this one

Answer 5

First identify that its an ionic compound

Name the metal = magnesium
* I would note state the charge as a roman numberal because its a group 1 or 2 metal
* Only stating roman numberals for the transitional metals

Name the non metal w/ an ide ending (just like molecular compounds)

Magnesium Iodide

Rules for ionic compounds

Question 6

Answer 6

Question 7

Answer 7

No hydro so must be an oxyacid (not binary)
* identifying what kind of compound it is is most important

Question 8

Answer 8

Must be an ionic compound because it has a polyatomic ion in it and its not an oxyacid (has no word acid in it)

No roman numerals needed because its polyatomic and Ca2+ is a known charge in group 2 (we don’t do roman numerals unless its a transition metal)

CaSO3

Question 9

Answer 9

Question 10

Answer 10

NOTE: for binary we use hydro ic..acid –> however for oxyacids we use ous/ic acid depending on if its ate or ite in the suffix of the polyatomic

Question 11

Answer 11

Question 12

Missed this one

Answer 12

This one is tricky because its two polyatomic stuck together - we dont really use polyatomics very often as the cation –> however, in this situation the positive charge is a polyatomic

This is an example of an ionic compound w/ no metals in it (because all of the polyatomics are made up of anions)

1) Name the metal (or polyatomic ion)
* Ammonium

2) State the metals oxidation state as a roman numberal in parathesis (except for group 1/2, Al, Zn, Cd, Ag) <— also don’t do the roman numberals if that cation portion is a polyatomic (think ammonium)

3) name the non-metal w/ an -ide ending (or name the polyatomic anion w/o adding -ide)

Ammonium Carbonate

so basically you’re just naming the anions in order is a simple way to remember this - w/o changing anything

Question 13

Answer 13

Well theres only 2 compounds and 1 of them isnt a polyatomic so this must be a binary acid, meaning we follow the rules “hydro…ic acid”

Hydroiodic acid

Question 14

Answer 14

2 nonmetals = molecular compound

don’t use the prefix mono for the first element

use the suffix ide, and put the # of atoms on the second element

Iodine Trichloride

Question 15

Answer 15

This is an ionic compound. however, the first element comes from group 1 so we don’t have to worry about roman numberals

also don’t have to worry about # prefixes on these because they balence themseleves out and there will always be the same number each time because of the charges.
* So ionic compounds don’t get number prefixes!!!!!!
* They do get the ide though

Potassium Oxide

Question 16

Answer 16

This is an ionic compound. Has a metal and a polyatomic anion in it

na+
ClO-

NaClO –> note this is interchagable w/ NaOCl
* you can’t flip all polyatomics I would just know this one can flip –> I dont really know fi any other ones can

Question 17

Answer 17

2 nonmetals so must be covalent

We use # prefixes for molecular compounds
* except for when the first atom is mono then we don’t add mono –> but we do add mono to the second one

N2O4

Question 18

Answer 18

This is considered a binary acid because it only has 2 elements

use hydro…ic acid (think like hydrochloric acid –> HCL)

You would think it would be hydrosulfic acid (dropping the ur in sulfur, however its hydroisulfuric acid, not dropping anything in sulfur and simply adding ic - this seems specific to sulfur, idk why)

Question 19

Question 20

Do this one again

Answer 20

I can see the polyatomic so it must be an ionic compound

Zinc is actually not a transition metal and has a stable charge of +2, meaning we dont use the roman numerals

SO4^2- has a negative 2 charge so these balance out

Zinc Sulfate
* dont need to add the suffix ide because its a polyatomic ion
* Dont add a roman number because zinc (even though a transition metal) doesnt vary charges

Question 21

Answer 21

molecular compound

chlorine dioxide
* first part of molecular compounds don’t take on a prefix
* molecular compounds take on ide on the second portion

Question 22

check

Answer 22

The key here is to know hydrogen is not a metal, its considered a non metal

Calcium is considered a metal

So this must be an ionic compound

Ca is a group 2 metal, meaning it doesnt take on a roman numberal

Theres no # prefixes because ionic compounds balance themselves out because of the charges

Calcium Hydride
* added the ide because its an ionic compound

Question 23

Answer 23

notice its more than 2 elements and an acid so must be an oxyacid –> meaning it has a polyatomic ion in it
* dont use the prefix hydro
* ous = ite acid
* ic = ate acid
* no number prefixes in acid because the balance based on charges

PO4^3- = phosphate

so would need to know that PO3^3- = phosphite

Phosphorous Acid
* again the dropping letters is kind of weird here

Question 24

Answer 24

hydrogen atom (because the atom doesnt have a positive charge is the key - this is fucking stupid)

Question 25

Answer 25

same # of protons

Question 26

Answer 26

Question 27

Answer 27

Question 28

Answer 28

Question 29

Answer 29

Question 30

Answer 30

They have the same # of electrons