Worksheet 5 Key [PDF]

Answer Key for Worksheet 5 Part A: Nomenclature of Ions and Ionic Compounds 1. Complete the table below for the following monatomic metal and nonmetal ions. Atom Name

Ion Formula/Charge

Ion Name

barium

Ba+2

barium cation

phosphorus

P-3

phosphide anion

copper

Cu+1

copper(I) cation

iodine

I-1

iodide anion

gallium

Ga+3

gallium cation

selenium

Se-2

selenide anion

nickel

Ni+3

nickel(III) cation

hydrogen

H -1

hydride anion

magnesium

Mg+2

magnesium cation

aluminum

Al+3

aluminum cation

lead

Pb+4

lead(IV) cation

potassium

K +1

potassium cation

sulfur

S-2

sulfide anion

fluorine

F-1

fluoride anion

zinc

Zn+2

zinc cation

2. Write formulas for the ionic compounds listed below. Compound Name

Compound Formula

potassium nitride

K3N

aluminum sulfide

Al2 S3

barium nitrite

Ba(NO 2 )2

chromium(III) bromide

CrBr3

zinc phosphate

Zn3 (PO 4 )2

iron(II) carbonate

FeCO 3

potassium dichromate

K 2 Cr2 O 7

niobium(V) oxide

Nb2 O 5

ammonium sulfate

(NH 4 )2 SO 4

calcium thiocyanate

Ca(SCN)2

silver hydroxide

AgOH

manganese(IV) chlorate

Mn(ClO 3 )4

lithium acetate

LiC2 H 3 O 2

tin(II) bicarbonate

Sn(HCO 3 )2

gallium oxalate

Ga2 (C2 O 4 )3

copper(I) oxide

Cu2 O

strontium phosphide

Sr3 P2

mercury(II) sulfite

HgSO 3

potassium peroxide

K2O2

ammonium bromide

NH 4 Br

cesium bisulfite

CsHSO 3

cobalt(III) nitrate

Co(NO 3 )3

magnesium cyanide

Mg(CN)2

titanium(IV) phosphite

Ti3 (PO 3 )4

sodium hypochlorite

NaClO

gold(I) thiosulfate

Au2 S2 O 3

indium(III) iodide

InI3

lithium carbide

Li4 C

bismuth(V) chromate

Bi2 (CrO 4 )5

nickel(II) permanganate

Ni(MnO 4 )2

3. Write the names for the ionic compounds listed below. Compound Formula

Compound Name

MgH 2

magnesium hydride

Ba(ClO 2 )2

barium chlorite

SnF2

tin(II) fluoride

KNO 3

potassium nitrate

Li2 CrO 4

lithium chromate

(NH 4 )3 P

ammonium phosphide

TiO 2

titanium(IV) oxide

RbCN

rubidium cyanide

Zn(MnO 4 )2

zinc permanganate

Al(HSO 4 )3

aluminum bisulfate

Na2 S

sodium sulfide

CuSO 4

copper(II) sulfate

Sr(HCO 3 )2

strontium bicarbonate

FeN

iron(III) nitride

GaCl3

gallium chloride

Mn(C2 O 4 )2

manganese(IV) oxalate

CaSe

calcium selenide

Au2 (SO 3 )3

gold(III) sulfite

NaClO 4

sodium perchlorate

Mg(OH)2

magnesium hydroxide

Part B: Nomenclature of Acids 1. What element always leads the formula of an acid? Hydrogen 2. The names of acids depend on the type of anion they contain. Complete the following table: Name of Anion ends in

Name of Acid is

__ide

hydro___ic acid

__ate

___ic acid

__ite

___ous acid

3. Identify and name the anions in the following acids, then name the acids. Acid Formula

Anion in Acid

Acid Name

HBr (aq)

Br-1 , bromide

hydrobromic acid

H 3 PO 4 (aq)

PO 4 -3 , phosphate

phosphoric acid

HClO 2 (aq)

ClO 2 -1 , chlorite

chlorous acid

HCN (aq)

CN -1 , cyanide

hydrocyanic acid

HMnO 4 (aq)

MnO 4 -1 , permanganate

permanganic acid

H 2 SO 3 (aq)

SO 3 -2 , sulfite

sulfurous acid

4. From the name of the acid supplied, identify the anion it contains then write the correct formula for the acid. Acid Name

Anion in Acid

Acid Formula

Sulfuric acid

sulfate, SO 4 -2

H 2 SO 4 (aq)

Hydrofluoric acid

fluoride, F-1

HF (aq)

Chromic acid

chromate, CrO 4 -2

H 2 CrO 4 (aq)

Nitrous acid

nitrite, NO 2 -1

HNO 2 (aq)

Hydrophosphoric acid

phosphide, P-3

H 3 P (aq)

Oxalic acid

oxalate, C2 O 4 -2

H 2 C2 O 4 (aq)

Part C: Nomenclature of Simple Binary Covalent Compounds 1. Which of the following non-metals would you write first in a covalent compound's name or formula? oxygen or nitrogen iodine or chlorine silicon or sulfur 2. Write the names or formulas as required for each of the following covalent compounds. Compound

Name or Formula

Cl2 O 6

dichlorine hexaoxide

CO

carbon monoxide

H2S

hydrogen sulfide

ICl5

iodine pentachloride

N 2 F2

dinitrogen difluoride

Br3 O 8

tribromine octaoxide

XeCl4

xenon tetrachloride

SO 3

sulfur trioxide

tetraphosphorus decoxide

P4 O 10

tricarbon disulfide

C 3 S2

hydrogen iodide

HI

sulfur heptafluoride

SF7

dichlorine monoxide

Cl2 O

silicon tetrabromide

SiBr4

dinitrogen pentoxide

N2O5

3. Why is it necessary to use prefixes in the names of covalent compounds? In covalent compounds, the neutral non-metal atoms involved can combine in a variety of ratios, producing several different compounds (containing the same elements). Thus prefixes are needed in their names to differentiate between these compounds, by indicating the number of atoms of each non-metal atom found in them. 4. In what cases do we not use prefixes in the names of covalent compounds? The prefix "mono" is dropped from the name of the first element when there is only one atom of that element present. Also, no prefixes at all are used in the names of covalent compounds containing hydrogen.