我亮晶晶的的画板 by maggie chan https://padlet.com/maggiechanhk2015/1n1x0wul899n 4D (1) Chan Yan kei Chemistry en-us 2019-02-17 11:26:03 UTC 2024-11-21 11:57:18 UTC hello@padlet.com https://padlet-assets.s3.amazonaws.com/icons/Hotsun.png What is Corrosion maggiechanhk2015 https://padlet.com/maggiechanhk2015/1n1x0wul899n/wish/332095412

]]> 2019-02-17 11:31:05 UTC https://padlet.com/maggiechanhk2015/1n1x0wul899n/wish/332095412 maggiechanhk2015 https://padlet.com/maggiechanhk2015/1n1x0wul899n/wish/332095802 reaction of metals with oxygen and moisture in air]]> 2019-02-17 11:35:15 UTC https://padlet.com/maggiechanhk2015/1n1x0wul899n/wish/332095802 Corrosion of iron maggiechanhk2015 https://padlet.com/maggiechanhk2015/1n1x0wul899n/wish/332095944 called rusting.
Rust is the reddish-brown crust.]]> 2019-02-17 11:37:15 UTC https://padlet.com/maggiechanhk2015/1n1x0wul899n/wish/332095944 Rusting maggiechanhk2015 https://padlet.com/maggiechanhk2015/1n1x0wul899n/wish/332096811 - process of the corrosion of iron
rusting of copper
rusting of aluminium
]]> 2019-02-17 11:49:56 UTC https://padlet.com/maggiechanhk2015/1n1x0wul899n/wish/332096811 maggiechanhk2015 https://padlet.com/maggiechanhk2015/1n1x0wul899n/wish/332096965 Chemical name:
         hydrated iron(III) oxide
          Fe2O3·xH2O]]> 2019-02-17 11:52:44 UTC https://padlet.com/maggiechanhk2015/1n1x0wul899n/wish/332096965 maggiechanhk2015 https://padlet.com/maggiechanhk2015/1n1x0wul899n/wish/332097501 Experiment to show oxygen and water are essential conditions for rusting]]> 2019-02-17 12:01:01 UTC https://padlet.com/maggiechanhk2015/1n1x0wul899n/wish/332097501 maggiechanhk2015 https://padlet.com/maggiechanhk2015/1n1x0wul899n/wish/332098274 Tube A:
add anhydrous calcium chloride
-absorbs moisture in air
-only has oxygen and has NO water
NO RUSTING
Tube B:
boiled distilled water
 -to drive away the dissolved oxygen
layer of oil on surface
 - stop oxygen from dissolving in water        again
NO RUSTING
Tube C:
 iron nail is in contact with both oxygen and water
RUSTING OCCURS]]> 2019-02-17 12:09:50 UTC https://padlet.com/maggiechanhk2015/1n1x0wul899n/wish/332098274 Speed up the rusting process maggiechanhk2015 https://padlet.com/maggiechanhk2015/1n1x0wul899n/wish/332099538
  • Presence of ionic substances
  • Presence of acidic pollutants
  • Higher temperature
  • Scratching or bending the surface 
  • Attachment to a less reactive metal
    • ]]>     2019-02-17 12:25:32 UTC https://padlet.com/maggiechanhk2015/1n1x0wul899n/wish/332099538