Topic 4 - Chemical Bonding

Lesson

Outline lesson plan

Identifying Elements and Compounds

What is an ion

Positive ions

(not on end of year examination)

Negative ions

(not on end of year examination)

Identifying compounds

(not on end of year examination)

Learning outcomes

Students should be able to identify the following gases

ammonia (using damp red litmus paper),

carbon dioxide (using limewater),

chlorine (using damp litmus paper),

hydrogen (using lighted splint),

oxygen (using a glowing splint)

and sulfur dioxide (using aqueous potassium manganate(VII)

Students should understand that chemical reactions can involve transfer of electrons to obtain noble gas configuration. Students should be able to classify cations and anions as metals and non-metals.4.1b

Cations: - identify the following positive ions (cations)

use of the flame test to identify lithium, sodium,

potassium and copper(II)

Precipitation reactions

aluminium, ammonium, calcium, chromium(III),

copper(II), iron(II), iron(III) and zinc (using aqueous

sodium hydroxide

Anions – identify the following negative ions (anions)

carbonate (by reaction with dilute acid and then

limewater), chloride, bromide and iodide (by reaction

under acidic conditions with aqueous silver nitrate),

nitrate (by reduction with aluminium), sulfate (by

reaction under acidic conditions with aqueous barium ions) and sulfite (by reaction with dilute acids and then aqueous potassium manganate(VII))

Students should be able to identify the anion and cation in a compound using all the information supplied.

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