Calderglen High School corrosion 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Calderglen High School

Calderglen High School 1 What is corrosion? answer A chemical reaction involving a metal changing from an element to a compound Calderglen High School

Calderglen High School 2 Magnesium provides iron with sacrificial protection. In which direction do electrons flow? answer From magnesium to iron Calderglen High School

Which metal is used to galvanise iron? 3 Which metal is used to galvanise iron? answer zinc Calderglen High School

Calderglen High School 4 Which metal RUSTS? answer iron Calderglen High School

Give an example of how iron can be physically protected. 5 Give an example of how iron can be physically protected. answer Paint, grease, tin-plate, electroplate, galvanising, coat with plastic Calderglen High School

How does a physical barrier protect iron against rusting? 6 How does a physical barrier protect iron against rusting? answer Barrier to water and air (oxygen) Calderglen High School

Name the two main ways of protecting iron from rusting. 7 Name the two main ways of protecting iron from rusting. answer Physical protection and sacrificial protection Calderglen High School

Calderglen High School 8 Should a metal be ABOVE or BELOW iron in the electrochemical series to provide sacrificial protection answer ABOVE Calderglen High School

Calderglen High School 9 Chromium plated steel rusts quickly when scratched. Compared to iron is chromium more reactive or less reactive. answer Less reactive Calderglen High School

Why does salt speed up corrosion? 10 Why does salt speed up corrosion? answer Salt is an electrolyte Calderglen High School

How do salt and acid rain affect corrosion? 11 How do salt and acid rain affect corrosion? answer Speeds it up Calderglen High School

Calderglen High School 12 What is the test to show that rusting has occurred (test for Fe2+ ions?) answer Ferroxyl indicator turns blue Calderglen High School

What two conditions are required for rusting to take place? 13 What two conditions are required for rusting to take place? answer Water and oxygen Calderglen High School

What type of reaction takes place when a metal corrodes? 14 What type of reaction takes place when a metal corrodes? answer oxidation Calderglen High School