Metals & Metal Compounds D. Crowley, 2007. Metals & Metal Compounds To be able to predict the...
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Transcript of Metals & Metal Compounds D. Crowley, 2007. Metals & Metal Compounds To be able to predict the...
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Metals & Metal Metals & Metal CompoundsCompounds
D. Crowley, 2007D. Crowley, 2007
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Metals & Metal CompoundsMetals & Metal Compounds
To be able to predict the reactions between metals and metal To be able to predict the reactions between metals and metal compoundscompounds
Wednesday, April 19, 2023Wednesday, April 19, 2023
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Reactivity SeriesReactivity Series
What can you say about the reactivity of metals?What can you say about the reactivity of metals?
Some metals are more reactive than others (remember gold in Some metals are more reactive than others (remember gold in water is fine, sodium in water is not)!water is fine, sodium in water is not)!
We can order the reactivity of the metals, from most reactive to We can order the reactivity of the metals, from most reactive to leastleast
This is the reactivity series!This is the reactivity series!
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Reactivity SeriesReactivity Series
PotassiumPotassiumSodiumSodiumCalciumCalciumMagnesiumMagnesiumAluminiumAluminiumZincZincIronIronLeadLead
(Hydrogen)(Hydrogen)CopperCopperSilverSilverGoldGoldPlatinumPlatinum
Very reactive
Fairly reactive
Not very reactive
Not at all reactive
Metals below hydrogen do not react with water or acid – they do not easily tarnish!
Look at the reactivity series – see if you can Look at the reactivity series – see if you can come up with a way to remember it…come up with a way to remember it…
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DisplacementDisplacement
Some metals are more reactive than othersSome metals are more reactive than others
A displacement reaction is where one metal kicks another outA displacement reaction is where one metal kicks another out
A more reactive element reacts with a compound and A more reactive element reacts with a compound and pushes outpushes out a less reactive “rival” elementa less reactive “rival” element
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DisplacementDisplacement
E.g. zinc is more reactive than copper – it will react with the E.g. zinc is more reactive than copper – it will react with the copper oxide when heatedcopper oxide when heated
The zinc will The zinc will displacedisplace the copper, leaving copper on its own and the copper, leaving copper on its own and forming zinc oxide…forming zinc oxide…
zinc + copper oxide zinc + copper oxide → zinc oxide + copper→ zinc oxide + copper
Zn + CuO → ZnO + CuZn + CuO → ZnO + Cu
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DisplacementDisplacement
So the more reactive zinc has pushed the copper out, and formed So the more reactive zinc has pushed the copper out, and formed zinc oxidezinc oxide
It’s a bit like a little guy going out with a girl. Everything is fine, It’s a bit like a little guy going out with a girl. Everything is fine, until a bigger guy comes along and pushes the little guy awayuntil a bigger guy comes along and pushes the little guy away
The big guy gets the girl, the little guy goes home alone…The big guy gets the girl, the little guy goes home alone…
In our example, zinc is the big guy, copper the little guy, and the oxide is the girl!
Try the Chem Wars: -
http://sycd.co.uk/chemwars
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ExperimentExperiment
To prove the reactivity series, you are going to react a metal and a To prove the reactivity series, you are going to react a metal and a metal compound togethermetal compound together
Firstly you will need a copy of the results sheet…Firstly you will need a copy of the results sheet…
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Results SheetResults Sheet
Copper Copper sulphatesulphate
Iron sulphateIron sulphate Lead nitrateLead nitrate Magnesium Magnesium sulphatesulphate
Total Total reactionsreactions
CopperCopper
XXIronIron
XXLeadLead
XXMagnesiumMagnesium
XXTotalTotal
XX
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Experiment 1Experiment 1
Get a test tube rack, and 3 test tubesGet a test tube rack, and 3 test tubes Fill each test tube up ½ way with Fill each test tube up ½ way with copper sulphatecopper sulphate Add a small piece of Add a small piece of ironiron to one to one Add a small piece of Add a small piece of leadlead to the second to the second Add a small piece of Add a small piece of magnesiummagnesium to the third to the third
Has there been a reaction? Look for colour changes on Has there been a reaction? Look for colour changes on the surface of the metal; colour changes in the solution; the surface of the metal; colour changes in the solution; bubbles of gas given off; a temperature changebubbles of gas given off; a temperature change
If there was a reaction but a tick in your table; if not put If there was a reaction but a tick in your table; if not put a crossa cross
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Experiment 2Experiment 2
Get a test tube rack, and 3 test tubesGet a test tube rack, and 3 test tubes Fill each test tube up ½ way with Fill each test tube up ½ way with iron sulphateiron sulphate Add a small piece of Add a small piece of coppercopper to one to one Add a small piece of Add a small piece of leadlead to the second to the second Add a small piece of Add a small piece of magnesiummagnesium to the third to the third
Has there been a reaction? Look for colour changes on Has there been a reaction? Look for colour changes on the surface of the metal; colour changes in the solution; the surface of the metal; colour changes in the solution; bubbles of gas given off; a temperature changebubbles of gas given off; a temperature change
If there was a reaction but a tick in your table; if not put If there was a reaction but a tick in your table; if not put a crossa cross
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Experiment 3Experiment 3
Get a test tube rack, and 3 test tubesGet a test tube rack, and 3 test tubes Fill each test tube up ½ way with Fill each test tube up ½ way with lead nitratelead nitrate Add a small piece of Add a small piece of coppercopper to one to one Add a small piece of Add a small piece of ironiron to the second to the second Add a small piece of Add a small piece of magnesiummagnesium to the third to the third
Has there been a reaction? Look for colour changes on Has there been a reaction? Look for colour changes on the surface of the metal; colour changes in the solution; the surface of the metal; colour changes in the solution; bubbles of gas given off; a temperature changebubbles of gas given off; a temperature change
If there was a reaction but a tick in your table; if not put If there was a reaction but a tick in your table; if not put a crossa cross
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Experiment 4Experiment 4
Get a test tube rack, and 3 test tubesGet a test tube rack, and 3 test tubes Fill each test tube up ½ way with Fill each test tube up ½ way with magnesium sulphatemagnesium sulphate Add a small piece of Add a small piece of coppercopper to one to one Add a small piece of Add a small piece of ironiron to the second to the second Add a small piece of Add a small piece of leadlead to the third to the third
Has there been a reaction? Look for colour changes on Has there been a reaction? Look for colour changes on the surface of the metal; colour changes in the solution; the surface of the metal; colour changes in the solution; bubbles of gas given off; a temperature changebubbles of gas given off; a temperature change
If there was a reaction but a tick in your table; if not put If there was a reaction but a tick in your table; if not put a crossa cross
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ReactionsReactions
So some metals are more reactive than So some metals are more reactive than others – of ours the reactivity series of others – of ours the reactivity series of the metals was: -the metals was: -
Magnesium Magnesium (3 displacements)(3 displacements)
Iron Iron (2 displacements)(2 displacements)
Lead Lead (1 displacement)(1 displacement)
Copper Copper (0 displacements)(0 displacements)
Magnesium displaces the copper:
magnesium + copper oxide → magnesium oxide + copper
Iron displaces the copper:
iron + copper oxide → iron oxide + copper
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Equations - Equations - MagnesiumMagnesium
copper sulphate + magnesium → magnesium sulphate + copper
(REACTION)
iron sulphate + magnesium → magnesium sulphate + iron
(REACTION)
lead nitrate + magnesium → magnesium nitrate + lead
(REACTION)
The equations for the magnesium was: -
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Equations - Equations - IronIron
copper sulphate + iron → iron sulphate + copper
(REACTION)
lead nitrate + iron → iron nitrate + lead
(REACTION)
magnesium sulphate + iron → magnesium sulphate + iron
(NO REACTION)
The equations for the lead were: -
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Equations - Equations - LeadLead
copper sulphate + lead → lead sulphate + copper
(REACTION)
iron sulphate + lead → iron sulphate + lead
(NO REACTION)
magnesium sulphate + lead → magnesium sulphate + lead
(NO REACTION)
The equations for the lead were: -
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Equations - Equations - CopperCopper
iron sulphate + copper → iron sulphate + copper
(NO REACTION)
lead nitrate + copper → lead nitrate + copper
(NO REACTION)
magnesium sulphate + copper → magnesium sulphate + copper
(NO REACTION)
The equations for the lead were: -
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Equations - Equations - MagnesiumMagnesium
copper sulphate + magnesium → magnesium sulphate + copper
CuSO4 + Mg → MgSO4 + Cu (REACTION)
iron sulphate + magnesium → magnesium sulphate + iron
FeSO4 + Mg → MgSO4 + Fe (REACTION)
lead nitrate + magnesium → magnesium nitrate + lead
Pb(NO3)2 + Mg → Mg(NO3)2 + Pb (REACTION)
The equations for the magnesium was: -
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Equations - Equations - IronIron
copper sulphate + iron → iron sulphate + copper
CuSO4 + Fe → FeSO4 + Cu (REACTION)
lead nitrate + iron → iron nitrate + lead
Pb(NO3)2 + Fe → Fe(NO3)2 + Pb (REACTION)
magnesium sulphate + iron → magnesium sulphate + iron
MgSO4 + Fe → MgSO4 + Fe (NO REACTION)
The equations for the lead were: -
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Equations - Equations - LeadLead
copper sulphate + lead → lead sulphate + copper
CuSO4 + Pb → PbSO4 + Cu (REACTION)
iron sulphate + lead → iron sulphate + lead
FeSO4 + Pb → FeSO4 + Pb (NO REACTION)
magnesium sulphate + lead → magnesium sulphate + lead
MgSO4 + Pb → MgSO4 + Pb (NO REACTION)
The equations for the lead were: -
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Equations - Equations - CopperCopper
iron sulphate + copper → iron sulphate + copper
FeSO4 + Cu → FeSO4 + Cu (NO REACTION)
lead nitrate + copper → lead nitrate + copper
Pb(NO3)2 + Cu → FeSO4 + Cu (NO REACTION)
magnesium sulphate + copper → magnesium sulphate + copper
MgSO4 + Cu → MgSO4 + Cu (NO REACTION)
The equations for the lead were: -