Chemical Formula and Names Worksheet

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Match each name in the name list with the correct formula from the formula list.

NAME LIST

(1) sodium nitrite (16) magnesium oxide
(2) copper (II)oxide (17) potassium sulphate
(3) sodium iodide (18) magnesium nitride
(4) sulfur dioxide (19) sodium nitrate
(5) hydrogen sulfide (20) carbon tetrachloride
(6) magnesium phosphate (21) potassium sulphite
(7) potassium hydrogen carbonate (22) calcium chloride
(8) iron(III) chloride (23) sodium sulphide
(9) sulphur trioxide (24) sodium iodate
(10) iron(II) sulphide (25) iron (III) oxide
(11) magnesium hydroxide (26) magnesium nitrate
(12) sodium bisulphate (27) sodium sulphate
(13) potassium carbonate (28) ammonium hydroxide
(14) carbon monoxide (29) iron(II) sulphate
(15) magnesium hydride (30) carbon dioxide

FORMULA LIST

FeS Mg0 K2S04
CaCl2 NH4OH Mg(N03)2
CO2 NaNO3 Mg3(PO4)2
Na2SO4 NaI03 Mg(OH)2
FeCl3 CO NaHSO4
NaI KHCO3 Fe2O3
Cu0 FeS04 Mg3N2
K2S03 NaNO2 S03
Na2S CCl4 K2CO3
MgH2 SO2 H2S

Check your answers here

Worksheet3: Chemical Names

Metal Non-Metal Compounds

If the name ends with an -ide, there will be usually only two elements n the compound, e.g. sodium chloride ( NaCl ). The metal part is named first and the non-metal part second. The non-metals name is changed to -ide to show that it is now joined in a compound.

So sodium chloride is made up of a sodium atom and a chlorine atom joined together by a chemical bond. The only exception to this rule is when the second word is hydroxide (OH1- ), when there will be three elements.

 

Complete this table:

Name

Elements present

Formula

sodium chloride

Sodium & Chlorine

NaCl

potassium oxide

   
   

KCl

 

Potassium & Fluorine

 
   

Na2O

 

Sodium & carbon & oxygen

 

potassium suphide

   

potassium hydroxide

   
   

NaOH

 

Check your answers here

-ite and -ate

If the name ends in -ite or -ate there will be more than two elements in the compound and one of them will be oxygen.

e.g. Copper Sulphate, (CuSO4) Contains copper, sulphur and oxygen ( the -ate tells you)

The word endings -ate and -ite don’t mean exactly the same thing. For example sodium sulphate and sodium sulphite are different chemicals. The one with the most oxygen in it’s formula ends with -ate and the one with less oxygen ends in -ite.

e.g. NaNO3 is sodium sulphate and NaNO2 is sodium suplhite

Complete this table:

NAME

FORMULA

 

K2S

lead (II) nitrate

 
 

CaC2

Zinc (II) hydroxide

 
 

KNO3

calcium carbonate

 
 

K2N

sodium sulphite

 
 

KNO2

Silver (I) nitrite

 
 

NaOH

calcium sulphide

 
 

MgSO4

magnesium sulphate

 
 

Na2SO3

 

Check your answers here

Bi- compounds

Somtimes the -ite and -ate also include the word hydrogen, for example sodium hydrogen sulphate. This just means that as well as all the stuff you just worked out before, the compound also contains hydrogen. ( NaHSO4 ). Some people still use an older way of naming these which is to use the word bi- to instead of the word hydrogen.

e.g.NaHCO3 could be sodium hydrogen carbonate or sodium bi-carbonate

Complete this table:

Name

Formula

potassium hydrogen carbonate

 
 

NaHSO4

calcium bi-carbonate

 

 

Check your answers here

Metals

Some metals can form more than one compound with another element. e.g. Iron can form two different compounds with chlorine: FeCl2 and FeCl3.

The modern way to tell them apart is to use a Roman numeral after the metals name to show what charge the metal ion has, e.g. FeCl2 is iron (II) chloride and FeCl3 is iron (III) chloride.

There is another and older way which is still used by some people and that is to use the latin name for the element and putting -ic after the the higher charge and -ous after the lower charge.

Formula

Modern Name

Old Name

Fe2O3

   
 

iron (II) oxide

 
   

ferric bromide

FeS

   
 

iron (III) hydroxide

 
   

ferrous sulphate

 

Check your answers here

Non-Metal Compounds

Somtimes two non-metal elements bond together to form different compounds ike CO and CO2.

They both can’t be carbon oxide so we need to give them different names. We do this by giving them Greek prefixes:

mono one

di two

tri three

tetra four

Complete this table:

Name

Formula

Carbon dioxide

 
 

CO

Nitrogen Oxide

 
 

NO2

carbon tetrachloride

 
 

SO3

sulphur dioxide

 

Check your answers here