GCSE AQA C2 Covalent Substances: Two Kinds 3.0 / 5 based on 1 rating ? ChemistryStructure and bondingGCSEAQA Created by: Peter HicksonCreated on: 19-01-13 13:42 Substances with Covalent Bonds can either be ________ _________ or __________ __________. Simple Molecules or Giant Structures 1 of 21 In Simple Molecular Substances the Atoms form ____ _____ covalent bonds to form small Molecules of several Atoms. Very Strong 2 of 21 The forces of attraction between these Molecules are very _____. Weak 3 of 21 It is because of these weak Intermolecular forces that these Substances have very low _________ and _________ _______. Melting and Boiling Points 4 of 21 When Simple Molecular Substances melt or boil the _________________ _______ are broken and not the stronger Covalent Bonds. Intermolecular Forces 5 of 21 Most Simple Molecular Substances are are _______ or ________ at room temperature. Gases or Liquids 6 of 21 Simple Molecular Substances don't _________ __________. Conduct Electricity 7 of 21 Giant Covalent Structures are similar to Giant Ionic Structures (lattices) except that there are no __________ _____. Charged Ions 8 of 21 All the atoms are bonded to each other by ______ __________ ______. Strong Covalent Bonds 9 of 21 This means that Giant Covalent Structures have very high _________ and _________ _______. Melting and Boiling Points 10 of 21 Giant Covalent Structures Don't _______ ________ - not even when molten (except Graphite) Conduct Electricity 11 of 21 In Diamond each Carbon Atom forms 4 Covalent Bonds in a very ______ Giant Covalent Structure. Rigid 12 of 21 This Structure makes Diamond the ________ natural substance. Hardest 13 of 21 Silicon Dioxide (sometimes called Silica) is what ____ is made from. Sand 14 of 21 Each grain of Sand is 1 Giant Structure of Silicon and _________. Oxygen 15 of 21 In Graphite, each Carbon atom only forms _ Covalent Bonds. 3 16 of 21 This creates layers which are free to _____ over one another. Slide 17 of 21 This sliding is what makes Graphite ____ and slippery. Soft 18 of 21 Weak ______________ forces between layers mean Graphite can come off in layers - that's how a pencil works. Intermolecular 19 of 21 Graphite is the only Non-Metal which is a good __________ of _____ and _______________. Conductor of Heat and Electricity 20 of 21 Each Carbon atom has one _________(free) electron which allows Graphite to conduct Heat and Electricity. Delocalised 21 of 21
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