Chemistry unit 2 4.5 / 5 based on 2 ratings ? ChemistryExtracting metals /The reactivity seriesGCSEAQA Created by: Fay_BiddulphCreated on: 03-02-16 09:52 Which ion makes a solution acidic? H+ 1 of 28 Which ion makes a solution alkaline? OH- 2 of 28 What is the ionic equation for neutralisation? H+ + OH- -> h20 3 of 28 If you neutralise hydrochloric acid which type of salt would you get? Chloride 4 of 28 Why do positive ions go to the cathode? The cathode is negative and opposites attract. 5 of 28 Why do negative ions go to the anode? The anode is positive and opposites attract. 6 of 28 What is reduction? Making something smaller 7 of 28 What is oxidation? The gaining of oxygen 8 of 28 Why do ionic compounds not conduct electricity as a solid? The ions are not free to move around like in liquids and solids. 9 of 28 Why do ionic compounds conduct electricity as liquids or in solution? The ions are free to move around so can gain electricity and pass it on. 10 of 28 Why do ionic compounds have high melting points? They have high melting points because they are strong therefore allot of heat and energy is needed to break the bonds. 11 of 28 Why do simple covalent molecules exist as gases? They are weak bonds so can be easily broken without the need of allot of energy. 12 of 28 What is a precipitate and how do you spot one? when a solid is produced as a result of a reaction, this can be spotted as if it is a solid then the liquid will go cloudy. 13 of 28 How do you get salt crystals from a solution? Evaporation 14 of 28 How do you remove insoluble substances? filterisation 15 of 28 What does the group number tell us about an atom? The number of elsectrons in the outer shell 16 of 28 What is electrolysis? chemical decomposition produced by passing an electric current through a liquid or solution containing ions. 17 of 28 Name four ways of increasing the rate of a reaction Temperature, concentration, catalyst and surface area 18 of 28 What is a catalyst? A substance which increases the rate of a reaction 19 of 28 Why do thermo softening polymers melt when heated? Polymer chains can uncoil and move 20 of 28 Why do thermosetting polymers NOT melt when heated? They are joined together by cross links so they can't move 21 of 28 What is a mixture of metals called? An alloy 22 of 28 Why are alloys harder than pure metals? The atoms in alloys are different sizes therefore making the bonds harder and stronger. 23 of 28 Why does diamond have a high melting point? It's made up of strong covalent bonds 24 of 28 Why does graphite (and all metals) conduct electricity? The electrons have freedom to move so pass on energy to each other as they collide 25 of 28 what is an isotope? Atoms of the same element that have different numbers of neutrons 26 of 28 What is a covalent bond? The sharing of electron pairs between atoms 27 of 28 Why can graphite be used as a lubricant? The layers slide over each other easily because there are only weak forces between them 28 of 28
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