Remake of 我的天真又可愛又無邪的超級無敵神奇小畫版 by Alan tse https://padlet.com/tsn6507/nnkcz9eonf4q Oh my eyes en-us 2019-02-18 13:10:48 UTC 2019-02-18 13:11:38 UTC hello@padlet.com https://padlet-uploads.storage.googleapis.com/357441989/5063c60d8a02aa58b162ac328e7ce8b9/20190217_191634.jpg Unit 13 tsn6507 https://padlet.com/tsn6507/nnkcz9eonf4q/wish/332329153 Corrosion of metals and their protection🌝]]> 2019-02-18 13:10:48 UTC https://padlet.com/tsn6507/nnkcz9eonf4q/wish/332329153 13.1 what is corrosion? tsn6507 https://padlet.com/tsn6507/nnkcz9eonf4q/wish/332329154 The deterioration of a metal due to its reaction with oxygen , moisture or other substances in the environment is called corrosion]]> 2019-02-18 13:10:48 UTC https://padlet.com/tsn6507/nnkcz9eonf4q/wish/332329154 tsn6507 https://padlet.com/tsn6507/nnkcz9eonf4q/wish/332329155 Giant buddha is covered with gold in leaf form so it does not corrode]]> 2019-02-18 13:10:48 UTC https://padlet.com/tsn6507/nnkcz9eonf4q/wish/332329155 13.2 Rusting tsn6507 https://padlet.com/tsn6507/nnkcz9eonf4q/wish/332329156 The corrosion of iron is called rusting.Rust is the reddish-brown crust that forms on the surface of the iron.]]> 2019-02-18 13:10:48 UTC https://padlet.com/tsn6507/nnkcz9eonf4q/wish/332329156 what happens during rusting? tsn6507 https://padlet.com/tsn6507/nnkcz9eonf4q/wish/332329158 2019-02-18 13:10:48 UTC https://padlet.com/tsn6507/nnkcz9eonf4q/wish/332329158 During rusting (iron) tsn6507 https://padlet.com/tsn6507/nnkcz9eonf4q/wish/332329159 First , iron atoms lose electrons to from iron(II)ions.

The electrons then combine with oxygen and water to form hydroxide ions.

The iron(II) ions and hydroxide ions precipitate as iron(II) hydroxide. Iron(II) hydroxide then reacts with dissolved oxygen to form rust ,which is hydrated iron(III) oxide.]]> 2019-02-18 13:10:48 UTC https://padlet.com/tsn6507/nnkcz9eonf4q/wish/332329159 13.3 What factors can speed up the rusting process? tsn6507 https://padlet.com/tsn6507/nnkcz9eonf4q/wish/332329161 2019-02-18 13:10:48 UTC https://padlet.com/tsn6507/nnkcz9eonf4q/wish/332329161 1) Presence of ionic substances tsn6507 https://padlet.com/tsn6507/nnkcz9eonf4q/wish/332329162 The rusting process speed up if the water present contains ionic substances.]]> 2019-02-18 13:10:48 UTC https://padlet.com/tsn6507/nnkcz9eonf4q/wish/332329162 2) Presence of acidic pollutants tsn6507 https://padlet.com/tsn6507/nnkcz9eonf4q/wish/332329163 An industrial environment also speeds up the rusting process.This is due to the emission of acidic gases from factories.]]> 2019-02-18 13:10:48 UTC https://padlet.com/tsn6507/nnkcz9eonf4q/wish/332329163 3) Higher temperature tsn6507 https://padlet.com/tsn6507/nnkcz9eonf4q/wish/332329164 The chemical reaction becomes faster.The rusting process become faster too.]]> 2019-02-18 13:10:48 UTC https://padlet.com/tsn6507/nnkcz9eonf4q/wish/332329164 4)Scratchment or bending the surface tsn6507 https://padlet.com/tsn6507/nnkcz9eonf4q/wish/332329165 Rusting occurs more quickly where the iron surface is scratched or bent.]]> 2019-02-18 13:10:48 UTC https://padlet.com/tsn6507/nnkcz9eonf4q/wish/332329165 5)Attachment to a less reactive metal tsn6507 https://padlet.com/tsn6507/nnkcz9eonf4q/wish/332329166 The rusting process speed up if the iron is in contact with a less reactive metal, such as copper]]> 2019-02-18 13:10:48 UTC https://padlet.com/tsn6507/nnkcz9eonf4q/wish/332329166 13.4 To be cotinuted tsn6507 https://padlet.com/tsn6507/nnkcz9eonf4q/wish/332329167 2019-02-18 13:10:48 UTC https://padlet.com/tsn6507/nnkcz9eonf4q/wish/332329167