[cs_content][cs_section parallax=”false” separator_top_type=”none” separator_top_height=”50px” separator_top_angle_point=”50″ separator_bottom_type=”none” separator_bottom_height=”50px” separator_bottom_angle_point=”50″ style=”margin: 0px;padding: 45px 0px;”][cs_row inner_container=”true” marginless_columns=”false” style=”margin: 0px auto;padding: 0px;”][cs_column fade=”false” fade_animation=”in” fade_animation_offset=”45px” fade_duration=”750″ type=”1/1″ style=”padding: 0px;”][cs_text]Shipwrecks and Salvage > 2. Corrosion of Iron >
Use available evidence to analyse and explain the conditions under which rusting occurs[/cs_text][/cs_column][/cs_row][/cs_section][cs_section parallax=”false” separator_top_type=”none” separator_top_height=”50px” separator_top_angle_point=”50″ separator_bottom_type=”none” separator_bottom_height=”50px” separator_bottom_angle_point=”50″ style=”margin: 0px;padding: 45px 0px;”][cs_row inner_container=”true” marginless_columns=”false” style=”margin: 0px auto;padding: 0px;”][cs_column fade=”false” fade_animation=”in” fade_animation_offset=”45px” fade_duration=”750″ type=”1/1″ style=”padding: 0px;”][cs_text]
| Condition: | Effect on Reaction: | Explanation: |
| Oxygen and water present | Allows reaction to take place | Oxygen and water are both necessary, as together they can be reduced to form hydroxide ions |
| Electrolyte present | Increases rate | Allows ions to move freely between the site of oxidation and the site of reduction |
| Impure iron | Increases rate | Impurities may act as the cathode |
| Iron in contact with less active metal | Increases rate | Less active metal serves as the cathode |
| Iron under mechanical stress | Increases rate | Individual iron atoms are less tightly bonded together and can more easily break away |
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