CambridgeInternationalASandALevelChemistry OriginalmaterialCambridgeUniversityPress2011 1

Worksheet4.1

Showingbondingwithdotandcrossdiagrams

1 Drawdotandcrossdiagramstodescribehowionicbondsareformedinthefollowingcompounds.a sodiumchlorideb magnesiumoxide [4]

2 Drawdotandcrossdiagramstodescribethecovalentbondinginthefollowingelements.a hydrogenb chlorinec oxygen [3]

3 Drawdotandcrossdiagramstodescribethecovalentbondinginthefollowingcompounds.a hydrogenchlorideb waterc ammoniad methanee carbondioxidef etheneg theammoniumion [7]

4 DescribethedifferencebetweenoneoftheNHbondsintheammoniumionandtheotherthreeNHbonds. [2]

Questions14aboveallinvolvesubstancesrequiredintheexamsyllabus.Youshouldthereforeensureyoucandothemsuccessfullybeforemovingon toquestion 5.

5 Drawdotandcrossdiagramstodescribethebondinginthefollowingsubstances.Yourfirstdecisionmustbewhetherthebondingisionicorcovalent.a hydrogensulfideb nitrogenc sodiumoxide(beforeandafterbonding)d fluorinee magnesiumchloride(beforeandafterbonding) [7]