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Names & Formulas

Review

Are you ready to review?

A few pointers: Know your ion names and formulas

– “A” ions - “B” ions - polyatomics

– Be able to tell which cations (positive ions) make

multiple charges; they need roman numerals in

the name

Oxidation numbers: know how to determine

them

– Remember neutral elements = 0

– Oxygen is often -2 (except in peroxide)

– Hydrogen is +1 with nonmetals and in acids; -1

with nonmetals

– The more electronegative element gets the more

negative oxidation number

A few pointers (continued): Acids

– Know when to use the hydro- prefix: only for

binary (2 element) acids, never for acids with

polyatomics

– -ate -ic ; -ite -ous

Know your number prefixes and when to use

them: only for binary (2 element) nonmetal

compounds (ex: CO2, PCl5).

Formulas for ionic compounds are written in

the lowest whole number ratio (ex: lead (IV)

oxide = PbO2 NOT Pb2O4)

Names & Formulas Review

Question 1: Which of these acids

would NOT use the prefix hydro-

in its name?

A) HCl

B) HClO3

C) H2S

D) HF


Answer 1:

A) HCl = hydrochloric acid

B) HClO3 = chloric acid

C) H2S = hydrosulfuric acid

D) HF = hydrofluoric acid

Remember, acids made from

polyatomic ions DO NOT use the

hydro- prefix, so choice B is the

answer.

Names, Formulas, and Bonding

Game

Question 2: What is the name of

this compound: KClO3


Answer 2: KClO3 is potassium

chlorate.


Question 3: Which compound would use

a roman numeral in its name?

A) MgO

B) K2O

C) ZnO

D) PbO


Answer 3:

A) MgO = magnesium oxide

B) K2O = potassium oxide

C) ZnO = zinc oxide

D) PbO = lead (II) oxide

Remember, only metals that make

multiple charges use roman

numerals.


Question 4: What is the oxidation

number of sulfur (S) in the

following compound?

Na2SO4


Answer 4: What is the oxidation

number of sulfur (S) in the following

compound?

Na2SO4, the oxidation number of S is +6

Na’s oxidation number is +1; O’s is -2.

They all have to add up to zero

2(+1) + 4(-2) + S = 0; S = +6


Question 5: Write the formulas for each

of the following compounds:

A) Dihydrogen monoxide,

B)Carbon tetrachloride

C) iron (III) chloride

D) iron (III) chlorate

E) nickel chloride dihydrate

F) oxalic acid

G) hydrophosphoric acid


Question 5: Write the formulas for each of

the following compounds:

A) Dihydrogen monoxide = H2O

B)Carbon tetrachloride = CCl4

C) iron (III) chloride = FeCl3

D) iron (III) chlorate = Fe(ClO3)3

E) nickel chloride dihydrate = NiCl2· 2H2O F) oxalic acid = H2C2O4

G) hydrophosphoric acid = H3P


Question 6: What is the difference

between sulfuric acid and

hydrosulfuric acid ?



between sulfuric acid and hydrosulfuric

acid ?

Sulfuric acid contains the polyatomic ion

sulfate; its formula is H2SO4.

Hydrosulfuric acid is made of only

hydrogen and sulfur (binary acid); its

formula is H2S.



between phosphoric acid and phosphorous acid ?


Question 7: What is the difference between

phosphoric acid and phosphorous acid ? Phosphoric acid is made from the phosphate

ion; its formula is H3PO4.

Phosphorous acid is made from the

phosphite ion; its formulas is H3PO3.

Remember –ate -ic; -ite -ous


Question 8: Name the following

compounds:

A) Na2SO4

B) PF5

C) CoCl2· 3H2O

D) N2O4

E) HI

F) HIO4

G) SnCl2

H) CuOH


Question 8: Name the following compounds:

A) Na2SO4 = sodium sulfate

B) PF5 = phosphorus pentafluoride

C) CoCl2· 3H2O = cobalt (II) chloride trihydrate

D) N2O4 = dinitrogen tetroxide

E) HI = hydroiodic acid

F) HIO4 = periodic acid

G) MnO2 = manganese (IV) oxide H) CuOH = copper (I) hydroxide


Question 9: What is the correct formula for iron (III) phosphite ?


Question 9: What is the correct

formula for iron (III) phosphite ?

FePO3


Question 10: What is the name of this compound: HClO3?


Answer 10: HClO3 is chloric acid.


Question 11: What are the

oxidation numbers of each element in HClO3?


Answer 11: What are the oxidation

numbers of each element in HClO3?

H = + 1

O = -2

Cl = +5

Remember the oxidation numbers have to

add up to zero for the compound.


Question 12: What is the proper name for this compound: MgF2?


Answer 12: MgF2 is magnesium fluoride.


Question 13: What are the

oxidation numbers for the

elements in each example?

A) O2,

B) CH4

C) Li2O2,

D) CO32-

E) CO


Question 13: What are the oxidation

numbers for the elements in each example?

A) O2 ; O = 0 (neutral element)

B) CH4; C = -4, H = +1

C) Li2O2; Li = +1, O = -1 (peroxide rule)

D) CO32- ; C = +4, O = -2 (polyatomics

add up to the charge on ion)

E) CO; C = +2, O = -2


Question 14: What is the proper name for this compound: CuI2?


Answer 14: The compound is copper (II) iodide.


Question 15: What is the proper

formula for titanium (IV) sulfate?


Answer 15: The formula for titanium (IV) sulfate is Ti(SO4)2.


Question 16: What is the formula of diiodine heptoxide?


Answer 16: The formula of diiodine heptoxide is I2O7.


Question 17: Name each

compound:

A) TiO2

B) CO2

C) OF2

D) HF

E) Ag2O


Answer 17: Name each compound:

A) TiO2 = titanium (IV) oxide

B) CO2 = carbon dioxide

C) OF2 = oxygen difluoride

D) HF = hydrofluoric acid

E) Ag2O = silver oxide


Question 18: Write formulas for the

following compounds

A) Tungsten carbide

B) Xenon hexafluoride

C) Strontium nitrate

D) Magnesium nitride

E) Hypochlorous acid

F) Chromic acid

G) Ammonium carbonate


Answer18: Write formulas for the following

compounds

A) Tungsten carbide = W2C3

B) Xenon hexafluoride = XeF6

C) Strontium nitrate = Sr(NO3)2

D) Magnesium nitride = Mg3N2

E) Hypochlorous acid = HClO

F) Chromic acid = HCrO4

G) Ammonium carbonate = (NH4)2CO3

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