This document discusses oxidation and rusting reactions. It explains that oxidation reactions occur faster with larger surface areas and require oxygen. Oxidation of food makes it unpleasant over time, but antioxidants can be added to foods to prevent or slow oxidation. Rusting of metals is also an oxidation reaction that occurs when water in the air reacts with metals, weakening them. Methods to prevent rusting include coating metals, painting, galvanizing, and mixing metals to form alloys like stainless steel.

1. By Firman

2.  This reaction is in fast speed such as explosion.
 Larger surface area will increase the speed of
the reaction and increase the energy output.
 Ex : coal dust reacts faster than coal when
burning due more surface area touch with
oxygen.

3.  Food start to be unpleasant if you keep it for a
long time. This due to oxygen reacting with the
food.
 The process Is called oxidation.
 Oxidation cannot take place without oxygen.

4.  In food chemical added to the food to prevent
oxidation or make the oxidation process take
longer time.
 This chemical is called antioxidants.

5.  Rusting that happen in metal because water
vapor in the air touch the metal.
 The water vapor is containing oxygen.
 The brown flake is called rust.

6.  If metal get rust usually they’re not strong
again.
 If the steel in a bridge is not strong the bridge
will break down.

7.  Warmed
 Salt

8.  Metal can be coated with other metal to
prevent rusting.
 Chromium can be coat to iron to in process
called chromium plating.
 Painting
 Galvanising plating (Zinc Plating)
 Mix metal with other. (Stainless Steel)

9.  Iron coated with zinc will protect the iron.
Because the zinc is more reactive and can be
peel of easily.
 Silver can be say to be tarnished because of
rusting. The rust can be remove by polishing.
 Copper in the roof react with oxygen to form
rust called vendigris.
 Bronze develop patina.