The Reactivity Series Flashcards

Question

What is an endothermic reaction?

Answer 1

A reaction that takes in heat energy (temperature falls)

Answer 2

- Iron reacts with copper sulphate - Forms iron sulphate and copper - Copper sulphate will go from blue to pale green - Iron will go from grey to brown - CuSO4 + Fe --> FeSO4 +Cu - If you put a piece of silver metal into a solution of copper sulphate, nothing happens, since the more reactive metal (copper) is already in the salt

Answer 3

- Aluminium reacts with iron oxide - Iron displaced from iron oxide by the more reactive aluminium - Forms aluminium oxide and iron - This is a thermite reaction: used for welding railway lines - Fe2O3 + 2Al --> Al2O3 + 2Fe

Answer 4

- Hydrogen will reduce hot oxides of less reactive metals | - Hydrogen has a varying place because these reactions depend on temperature (which can change with reactivity)

Answer 5

-Carbon will reduce oxides low in reactivity -This is useful for extracting metals from ores and carbon cheaply reduces oxygen from oxide leaving metal -Reactive metals (e.g. magnesium) can reduce carbon dioxide (Placed above Iron as does not EASILY reduce metal oxides higher up)

Answer 6

- Water and oxygen (from the air) must be present - Fe2O3 dark red rust - Salt is a catalyst to the reaction (coast salt in air) - The chemical reaction that takes place when iron corrodes is oxidation as the iron gains oxygen and becomes iron (III) oxide - Water then becomes loosely bonded to the iron (II) oxide and the result is hydrated iron (II) oxide, which we call rust - Iron + oxygen + water --> hydrated iron (III) oxide (rust)

Answer 7

- Paint/oil/grease/plastic can be used to cover oxygen to prevent oxygen and water getting to it 1. Paint and coating with plastic ideal for big and small structures alike, can be decorative too 2. Oiling and greasing has to be used when moving parts are involved, like on bike chains

Answer 8

- Using a more reactive metal rather than iron so that the oxygen and water will react with the sacrificial meta; instead of with the iron - Galvanising iron covering it with a zinc layer (coating of zinc sprayed onto the object) - Large lumps / big blocks of magnesium or zinc bolted to iron, used on ships' hulls or on underground iron pipes / to pipes or boat keels to also react instead of iron - Zinc is cheaper than aluminium or tin and the others are too reactive

Answer 9

- Example 1: 1. More reactive metals react more strongly that less reactive metals 2. This means that a more reactive metal will displace a less reactive metal from its oxide because it will bond more strongly to the oxygen - Example 2: 1. Metal compounds like copper sulphate, zinc chloride and sodium chloride are metal salts 2. If you put a reactive metal into a solution of a less reactive metal salt the reactive metal will replace the less reactive metal in the salt

Answer 10

1. Given a lump of a mystery metal and you could try reacting it with different metal oxides and salts 2. If it reacted with copper oxide you would know it was higher in the series than copper 3. If it didn't react with magnesium sulphate you would know it was lower than magnesium in the reactivity series