Reactivity series Flashcards

1
Q

Reactivity series in order

A

potassium
sodium
lithium
calcium
magnesium
aluminium
carbon
zinc
iron
hydrogen
copper
silver
gold

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2
Q

which metals will react with dilute acids

A

metals above hydrogen

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3
Q

metal + acid ->

A

salt + hydrogen

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4
Q

Mg + H2sSO4 ->

A

MgSO4 + H2

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5
Q

does the reactivity increase or decrease going down the reactivity series

A

decreases

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6
Q

a _____ reactive metal with displace a ____ reactive metal from its compound

A

1) more
2) less

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7
Q

2 types of metal displacement reactions

A

1) reacting a metal with metal oxide (by heating)

2) reacting a metal with an aqueous solution of a metal compound

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8
Q

Zn + CuO -> ?

A

ZnO + Cu

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9
Q

how can the reactivity of 2 metals be compared

A

using displacement reactions

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10
Q

state observations for magnesium and copper (II) sulfate solutions

A
  • the blue color of CuSO4 fades and colorless magnesium sulfate is formed
  • copper coats the surface of magnesium and forms solid metal at the bottom
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11
Q

what is rusting

A

a chemical reaction between iron, water and oxygen

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12
Q

what must be present for rusting to occur

A

oxygen and water

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13
Q

where does rusting happen the fastest

A

salty water because NaCl speeds up reaction

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14
Q

word equation for rusting

A

Iron + water + oxygen -> Hydrated Iron (III) Oxide

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15
Q

symbol equation for rusting

A

4Fe (s) + 3O2(g) + xH2O (I) -> 2Fe2o3. x H2o (s)

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16
Q

3 methods to prevent rusting

A
  • barrier method
  • galvanising
  • sacrificial protection
17
Q

barrier method of rusting

A
  • prevents iron from coming in contact with water and oxygen
18
Q

galvanising

A

process in which iron is protected by being coated with a layer of zinc

19
Q

how does zinc prevent iron from rusting

A

ZnCO3 is formed when zinc reacts with oxyen and co2 and protects the iron

20
Q

advantages of galvanising

A

even if scratched iron is still protected because zinc corrodes

21
Q

sacrificial corrosion

A

occurs when a more reactive metal is intentionally allowed to corrode

22
Q

oxidation reaction

A

when a substance gains oxygen

23
Q

reduction reaction

A

when a substance loses oxygen

24
Q

Zn + CuO -> ZnO + Cu
which gets oxidised and redoxed

A
  • copper (II) oxide supplies the oxygen so it is the oxydising agent
  • zinc is reducing agent as it removes the oxygen
25
do atoms lose or gain electrons when oxidised
lose
26
write the ionic equation for Mg in magnesium and copper sulfate
Mg -> Mg2+ + 2e-
27
reduction is ____ of electrons
gain
28
observations when reacting magnesium with HCL
- dissolves quickly - gas is given off which goes pop - colorless solution
29
observations with iron and HCL
slow bubbling
30
Observations with HCL and zinc
bubbles given off metal slowly dissolves
31
observations of Mg with sulfuric acid
rapid bubbling splint goes pop metal dissolves
32
observations of Fe with sulfuric acid
slow reaction small bubbles seen
33
observations of Zn with sulfuric acid
-metal dissolves forming colorless solutions -gas given off slowly