Introduction to Bonding - Week 10 (3 lessons)
LG 1:Students can write and describe the exchange of electrons in compounds formed from ions (ionic compounds)
Collaborative groups (CCTS), teacher led Direct Instruction - The key question in this LG is "Why do elements react the way that they do?". But to answer this students must first understand... what does "react" mean in chamistry? Works in small groups on this latter question. When the class has a satisfactory answer, try the first "key" question, again in groups. Teacher to make notes on electron exchange and electron sharing (via electron configeration and electronegativity, ion formation, electrostatic attraction) from class discussion. I think it is a good idae to introduce electron exchange (ionic) versus electron sharing (metallic and covalent) The videos below are good for students who want to prepare early, or struggle with the ideas.
Introduction to ionic bonding - creating ions and electron transfer. Part of a very old video series and not one I own, so this is breaking copyright. However I can no longer source this video commercially and despite low resolution it is excellent.
How ionic lattices form. Part of a very old video series and not one I own, so this is breaking copyright. However I can no longer source this video commercially and despite low resolution it is excellent.
Valence electrons and the periodic table - Tyler DeWitt (Simple,Excellent)
Why atoms lose or gain electrons - actually called "octet rule and valence charges" - it claims to be clear and simple and it actually is
Writing chemical (ionic) formulas Tyler Dwitt - good simple introduction
Checking For Understanding - The next resource is a good checking for understanding worksheet. It is adapted from an exam question released years ago in a C2C exam.
The periodic table on the planet MuAran If you can do this you know all you need to know about electron configeration, electron exchange, ions and ionic formula.
Worksheet Comparing Ionic and Covalent - a one pager, nice simple check for understanding
LG 2: Students can draw Lewis diagrams of simple ionic and covalent formula
Direct Instruction - Direct instruction on Lewis diagrams is important here, covering both ionic and covalent. Most Lewis diagram worksheets will cover only covalent molecules. Model drawing valence shells, electron counting, electron exchange (ionic), and electron sharing (covalent)
Excellent -Lewis diagrams - an ACS Chemistry page. Written from a teachers point of view. Has great Video, recommend you Direct Instruction first, show video after or as you teach examples. Has a student activity sheet (right menu, quite long for about 9 Qs), and answers
Lewis diagrams for covalent molecules - crashcourse, great inro and mentions the rules for drawing lewis diagrams, simple molecules only. Hint play at 0.8 speed.
Lewis diagrams for covalent molecules - Sciencepost, very useful tutorial, gos thru some simple and then some more complex lewis structures. A good follow up to the crashcourse video.
LG 3: Students can explain that basic differences in the physical properties of Ionic and Covalent substances using basic description of lattice and molecular structure
NOTE: LG 3 leads direct to LG1 in the next section - in LG 3 "basic" relates most likely to the fact that chemical bonds hold ionic lattices together, but physical forces hols covalent molecules together. Use this to explain high MPt versus low MPt
Brief notes on Ionic Bonding Good to have in front of you for this lesson or use as study notes
Covalent Molecular Bonding brief notes - need only page 1 notes (ignore the table of molecule structures)for this LG
Properties of ionic bonding - not professionally produced but well explained
MC quiz on Ionic Bonding
Quiz (easy) on Covalent Molecular Bonding