Chemistry- Rust Flashcards Preview

Grade 9- July Exams > Chemistry- Rust > Flashcards

Flashcards in Chemistry- Rust Deck (8):
1

Rust is a

Form of corrosion

2

Only occurs on the

Surface of iron that is exposed to oxygen and water

3

Iron reacts with

Water and oxygen to form iron hydroxide (orange and fuzzy)

4

Iron hydroxide dries

Out and loses its water forming iron oxide (Fe2O3)

5

Fe2O3

Rust

6

Painting

Prevent rusting by applying a layer of paint. The paint layer prevents oxygen and water from coming into contact with iron.

7

Electroplating

Coat iron or steel in a thin layer of chromium or zinc.
It involves the passing of an electric current through a zinc-based or chromium-based solution. Metals atoms are then allowed to deposit on the iron or steel that is dipped into the solution.
More expensive than painting.
Chromium and zinc don't rust.
Also improves the appearance of the object.

8

2Fe + O2 ->

Fe2O3 (unbalanced)

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