0910 S3 CHEM Revision

Revision Exercise on Revision Exercise on Structures & PropertiesStructures & Properties

S3 Chemistry

Bonding StructureBonding Structure

1. What is the bonding structure of the compound/element formed by :

a) Sodium Atoms

b) Chlorine and Potassium

c) Carbon and Oxygen

d) Carbon (in form of diamond)

Giant Metallic Structure

Giant Ionic Structure

Simple Molecular Structure

Giant Covalent Structure

(Metal ←→Metal)

(Metal ←→Non-metal)

(Non-metal ←→Non-metal)

(Non-metal ←→Non-metal)

Van der Waal’s Attraction between molecules

Bonding Structure ComparisonBonding Structure Comparison

StructureGiant Ionic Structure




Attraction betweenMetal and Nonmetal

Metal and Metal

Nonmetal and Nonmetal


Melting point / Boiling pointMelting point / Boiling point

2. Map the compound/element to their melting point & boiling point.

Sodium 3550 oC /4827 oCPotassium chloride 98oC/883oC

Carbon Dioxide - 78 oC / - 57 oC

Diamond 770 oC /1420 oC

Strong bond / Giant metallic structure

Strong bond / Giant ionic structure

Weak Van Der Waal’s Attraction

Strong bond / Giant covalent structure

Melting point / Boiling point Melting point / Boiling point ComparisonComparison






Metal and Metal



AttractionStrong Ionic Bondbetween the ions

Strong Metallic Bond

between the positive ions and mobile electrons

Strong Covalent Bond

between the atoms

Intramolecular Strong Covalent Bondbetween the atoms.

Intermolecular Weak Van Der Waal’s Attraction

between the molecules.Melting point/ boiling

pointHigh High Very High Low

StateState

3. What are the states of the following substances ?

Sodium

Potassium Chloride

Carbon Dioxide

Diamond

(Solid)

(Solid)

(Gas)

(Solid)

State ComparisonState Comparison






Metal and Metal







between the atoms





State at room temperature and pressure

Solid Solid Solid Gas/Liquid

Electrical ConductivityElectrical Conductivity

4. Estimate the electrical conductivity of the following substance

Sodium Good / Poor Because

Potassium Chloride

Good / Poor ( ) Because

Carbon Dioxide Good / Poor( ) Because

Diamond Good / Poor( ) Because

Solid / Liquid

Molten

Any

Any

it has mobile electrons

it has mobile ions

it doesn’t have mobile eletrons/ions

it is a gas

Conductivity ComparisonConductivity Comparison






Metal and Metal







between the atoms







Electrical Conductivity

Good in molten state

Because it has mobile ions

Good in Solid or Liquid

Because it has mobile

electrons

PoorBecause it doesn’t

have mobile ions/electrons

Except graphite

PoorBecause it doesn’t have mobile ions/electrons

SolubilitySolubility

5. What are the solubility of the following substances ?

Sodium

Potassium Chloride

Carbon Dioxide

Diamond

(Insoluble)

(Soluble)

(Insoluble)

(Insoluble)

Solubility ComparisonSolubility Comparison






Metal and Metal







between the atoms












electrons



Except graphite


Solubility Soluble Insoluble Insoluble Insoluble

Integrated Question Integrated Question (Predict Structure)(Predict Structure)

a) What is the bonding structure of A ? Explain.

b) What is the bonding structure of B ? Explain.

c) What is the bonding structure of C ? Explain.

d) What is the bonding structure of D ? Explain.

Substance Melting point (oC)

Boiling point (oC)

Electrical ConductivitySolubility

Solid state Molten state

A 130 450 Good Good Insoluble

B 690 1790 Poor Good Soluble

C 1470 3420 Poor Poor Insoluble

D -99 -25 Poor Poor Insoluble

Giant Metallic Structure. Good Electrical Conductivity in Solid/Molten

Giant Ionic Structure. Good Conductivity in Molten & Soluble

Giant Covalent Structure. Poor Conductivity, Insoluble & high m.p./b.p.

Simple Molecular Structure. Low m.p./b.p., poor conductivity & insoluble

Integrated Question Integrated Question (Predict Properties)(Predict Properties)

a) Predict the state of each elements.b) Two compounds, one is formed by W and X and

another is formed by X and Z. Which one will soluble in water ? Explain it in details.

c) By considering all the substances above including the compounds in (b),

◦ Which one is the most hardness? Why?◦ Which one is not reactive? Why?◦ Which one is toxic? Why?◦ Which of them can conduct electricity? Why?

Element W X Y Z

Atomic number 6 9 10 11

2,4

Carbon

2,7

Florine

2,8

Neon

2,8,1

Sodium

ZX. Ionic Compound

W. Z is soft, X and Y are gases

Y . Octet structure, noble gasX. Group 7 are toxic.

Z, it is metal and ZX conduct in molten state

Essay Type QuestionEssay Type Question

MgO, SiO2, SO2 are oxides of Period 3 elements in the Periodic Table.

Discuss how the melting points of these oxides are related to their bonding and structure.

MgOMetal ,Non-metal

Ionic BondGiant ionic structure

SiO2

Non-metal, Non-metalCovalent Bond

Giant covalent structure

SO2

Non-metal, Non-metalCovalent Bond

Van der Waal’s AttractionSimple molecular structure

SiO2>MgO>SO2

SummarySummary






Metal and Metal







between the atoms












electrons



Except graphite


Solubility Soluble Insoluble Insoluble Insoluble

The EndThe End

0910 S3 CHEM Revision

Documents

ions positive ions

strong covalent bond

simple molecular structure

giant metallic structure

giant covalent structure

mobile ions electrons insoluble

low gas liquid poor

good poor