This resource I created for those students who are very demanding and want to know why the bond angle of 109.5 exists for the tetrahedral shape. It could also be an excellent starter activity for say 10 min and also tick the box for numeracy box !! I used this this year encourage motivation and to prove it cannot be 90 degrees which otherwise learners find hard top accept.
I have also attached the answers and the worksheet that can be drawn on the board OR printed out for the students.
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