a KBr ionic b CaCl 2 ionic c Li 2 O ionic d SiCl 4 ionic 2 marks covalent e PF

A kbr ionic b cacl 2 ionic c li 2 o ionic d sicl 4

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a.KBr – ionicb.CaCl2– ionicc.Li2O – ionicd.SiCl4– ionic -2 marks covalente.PF3– covalent (this structure has three single bonds)f.CS2– covalent (this structure has two double bonds)g.HCN – covalent (this structure has one single bond and one triple bond)
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12.For each of the following molecules, draw and name the VSEPR shape and indicate whether the molecule is polar or non-polar. -4 marks a.NF3– polarb.CCl4– non-polarc.SI2– polard.CS2– non-polar
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13.Examine the following table and identify which of the substances A to F are ionic, which are polar covalent, and which are non-polar covalent. Give a reason for your choice in each case.SubstanceMeltingPoint ()Solubility inwaterIonic/Polar Covalent/Non-Polar CovalentA‒178InsolubleNon-polar covalent; non-polar covalent molecules have a verylow melting point are not soluble in waterB‒101SolublePolar covalent; polar covalent molecules have a low meltingpoint and are usually soluble in waterC730SolubleIonic; the melting point for ionic substances are generally veryhigh and some are soluble in waterD‒25InsolubleNon-polar covalent; non-polar covalent molecules have a verylow melting point are not soluble in waterE‒94SolublePolar covalent; polar covalent molecules have a low meltingpoint and are usually soluble in waterF651SolubleIonic; the melting point for ionic substances are generally veryhigh and some are soluble in waterGood work!Make sure you read the questions very carefully to include all relevant chemistry concepts, structures, diagrams and explanations. Unit 1 Total Mark 85.5/97=88%
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