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AS2.4 Bonding, structure (External)
This externally assessed standard is worth 5 credits and is essential for
understanding at Level 3.
You will cover a large amount of content and the teaching  component will take
approximately 10 weeks of class time.

The following is a comprehensive list of all the key areas that you must cover for AS2.4.

 

WHAT YOU NEED TO KNOW!

  • Lewis diagrams of simple molecules (ie molecules having no more than four electron pairs about any atom, including multiple-bonded species).Ionic, covalent and metallic bonding. 
  • Polarity of the bonds using concepts such as electronegativity to justify your choice. 
  • You need to know how a polar bond is formed and the factors that determine the polarity of a molecule overall (shape of the molecule and the presence of polar bonds).Molecular shape, based on the number of bonding and non-bonding pairs of electrons. 
  • Make sure you can draw the shapes (using wedges and dotted lines to represent the 3-D shape) and explain why molecules are a particular shape.
  • Recognise bond angles of common shapes and explain why these bond angles occur.
  • Types of solids are restricted to molecular, ionic, metallic, and covalent network. The nature of solids will be limited to the type of constituent particles (ions, atoms, or molecules) and the attractive force between them (ionic, covalent, metallic bonds or weak intermolecular forces).
  • Physical properties of different solids in terms of the structure and bonding within the solid. 
  • Classification of reactions as exothermic and endothermic, using energy diagrams, the sign of ∆rH or heat changes.
  • Energy changes associated with bond making and bond breaking.
  • Enthalpy change relates to the change of energy in a chemical reaction.
  • Calculation of enthalpy changes given amounts or mass of substances, a balanced equation, and ∆rH.

  • Bond energy calculations. 

resources

AS2.4 Help Sheets.pdf
click to download
Shapes of Molecules 3D.ppt
click to download
Chem 2.4 Powerpoint.ppt
Old Practice Exam on ppt.
AS2.4 Spider Diagram Summary.docx
click to download

worksheets

Atomic Structure Questions.doc
click to download
Lewis Diagrams Questions.doc
click to download
Covalent Bonding.doc
click to download
Ionic Bonding Questions.doc
click to download
Metallic Bonding Questions.doc
click to download
Bond Energies Questions.doc
click to download

practice papers

Chem 2.4 Questions 12.doc
click to download
Chem 2.4 Questions 13.docx
click to download
Chemistry 2.4 Questions 14.docx
click to download
Chem 2.4 Answers 2015 Mid Year.docx
click to download
Chemistry 2.4 ANSWERS PRELIMS 2015.docx
click to download
Chemistry 2.4 FIRST MOCK 2016.docx
click to download

worksheet answers

Atomic Structure Answers.doc
click to download
Lewis Diagrams Answers.doc
click to download
Covalent Bonding Answers.doc
click to download
Ionic Bonding Answers.doc
click to download
Metallic Bonding Answers.doc
click to download
Bond Energies Answers.doc
click to download

answers for papers

Chem 2.4 Assess sched 12_1.doc
click to download
Chem 2.4 Assess sched 13.docx
click to download
Chemistry 2.4 Assess sched 14.docx
click to download (THIS YEARS PRELIM)
AS2.4 Assessment Week 2016 Answers.pptx
click to download

videos

Lewis Structures
Advanced Lewis Structures
VSEPR Theory and Shape
Covalent Network Solids
Molecular Shape
Stoichiometry
Electronegativity 1
Electronegativity 2
Ionic Solids
Metallic Bonding
Polarity
Polarity of Molecules
Metallic Nature
Molecular Solids
Heat of Reaction
Types of Bonding
Bond Polarity
Ionic, covalent & Metallic Bonds
Metallic Solids
Lewis Structures
Properties of Bonds