C2 - Unit 2 0.0 / 5 ? ChemistryStructure and bondingRate of reactionEnergy of reactions/Exothermic and endothermic reactionsElectrolysisAcids, bases and saltsGCSEAQA Created by: emilygibson97Created on: 05-04-14 21:33 What is ionic bonding? Compounds held together by strong forces between oppositely charged ions. 1 of 15 What is covalent bonding? When atoms of non-metallic elements join together by sharing electrons. 2 of 15 What are the characteristics of giant ionic compounds? High melting points, solid at room temperature, conduct electricity when melted or dissolved in water. 3 of 15 What are the characteristics of simple molecules? Low melting and boiling points, have no charge, do not conduct electricity and weak intermolecular forces. 4 of 15 What are the characteristics of giant covalent structures? Very high melting points, conduct electricity (graphite), each atom has 4 covalent bonds (diamond) and layers (graphite). 5 of 15 What are the characteristics of giant metallic structures? Can be bent and deformed and return to their shape when heated, conduct heat and electricity and are harder. 6 of 15 What is a thermosoftening polymer? Becomes soft when heated, but hard when cooled again - can be shaped then be remoulded by heating again. 7 of 15 What is a thermosetting polymer? Do not melt or soften when heated. 8 of 15 What are isotopes? Atoms of the same element with different numbers of neutrons 9 of 15 What does a mass spectrometer do? Finds the relative molecular mass of a compound from its ion peak. 10 of 15 What do acids produce when they are added to water? Hydrogen ions (H+) 11 of 15 What do alkalis produce when they are dissolved in water? Hydroxide ions (OH-) 12 of 15 What happens when an acid reacts with a base? A neutralisation reaction takes place and produces salt and water. 13 of 15 What happens when an acid and a metal react? A salt and hydrogen gas is produced, 14 of 15 How can insoluable salts be made? By reacting 2 solutions to produce a precipitate. 15 of 15
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