55 What is a list of elements ordered by their reactivity called? A reactivity series Chemical Changes - A reactivity series, What is the name for a rock with enough metal in it to be worth extracting? - An ore, In what three ways are metals extracted? - Mining, reduction with carbon, electrolysis, Which metals are extracted by reduction with carbon? - Those less reactive than carbon, Which metals are extracted by electrolysis? - Those more reactive than carbon, Why is gold found naturally in Earth's crust? - It is very unreactive, Name three acids - Sulfuric acid, hydrochloric acid, nitric acid, How can you tell if something is an acid or alkali? - Use an indicator, What pH do acids have? - Less than 7, What pH do alkalis have? - More than 7, What pH do neutral solutions have? - Exactly 7, What colour are acids in universal indicator? - Red, What colour are alkalis in universal indicator? - Blue/purple, What colour is neutral in universal indicator? - Green, What ion do all acids have? - H+, What ion do all alkalis have? - OH-, Complete the equation: metal + acid --> - Salt + hydrogen, Complete the equation: metal oxide + acid --> - Salt + water, Complete the equation: metal hydroxide + acid --> - . Salt + water, Complete the equation: metal carbonate + acid --> - Salt + water + carbon dioxide, Complete the equation: metal + oxygen --> - Metal oxide,

Unit 4 – Chemical Changes Qs 55-75

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