OXIDATION IN DAILY LIFE

• NAME : MANVI VOHRA• CLASS : XF• ROLL NO. : 27

ACKNOWLEDGEMENTI would like to express my special thanks of

gratitude to my teacher MS. ALKA GAUTAM who gave me the golden opportunity to do this wonderful project on the topic OXIDATION IN DAILY LIFE ,which also helped me in doing a lot of Research and I came to know about so many new things I am really thankful to them.Secondly I would also like to thank my parents and friends who helped me a lot in finalizing this project within the limited time frame.

INDEX• INTODUCTION OF OXIDATION• OXIDATION IN DAILY LIFE• CORROSION• WHAT IS CORROSION ?• DIFFERENT KINDS OF CORROSION• WHY RUSTING A PROBLEM• COPPER TARNISH• SILVER TARNISH• ALLUMINIUM CORROSION• GROUP DISCUSSION • HOW WE CAN PREVENT CORROSION• RANCIDITY • PREVENTION OF RANCIDITY• ADDING ANTIOXIDANTS• ANTIOXIDANTS IN ACTION • PACKING OF N2 GAS• REFRIGIRATION • STORING AWAY FROM LIGHT

OXIDATIONOXIDATION REACTION MEANS

COMBINATION OF MATERIAL WITH OXYGEN TO PRODUCE AN OXIDE.

OXIDISED GAINS OXYGEN

2Mg(s) + O2(g) = 2MgO(s)

The substance gaining oxygen (Mg) is oxidized .

OXIDATION IN DAILY LIFE

CORROSION RANCIDITY

WHAT IS CORROSION ?

Formation of layers of undesired conpounds such as metallic oxides, metallic hydroxide, metallic carbonates on the surface of metal is called corrosion.

It is slow oxidation caused by moist air containing oxygen, carbon dioxide and hydrogen sulphide.

DIFFERENT KINDS OF CORROSION

RUSTINGThe slow conversion of iron

into its hydrated ferric oxide in the presence of moist air is called Rusting.

4Fe + 3O2 + 2XH2O = 2Fe2O3.XH2OThe number of water molecules (x) in the rust varies, it is not fixed.

WHY RUSTING IS A PROBLEM

Every year, millions of dollars of damage are caused to buildings, vehicles and other iron and steel products.

Rust is porous, absorbing water like a sponge. When this happens layers flake off , leaving exposed metal to be attacked by this oxygen continues until the rust eats right through the metal.

COPPER TARNISH

Copper is attacked by moist air containing CO2 to form green colored hydrated copper carbonate CuCO3.Cu(OH)2

SILVER TARNISH

Unlike iron and aluminum , silver does not react with hydrogen sulphide forming hydrated silver sulphide which causes silver to develop a black coating .

The black layer is annoying but it can be removed by polishing the silver .

ALLUMINIUM CORROSION

Aluminum reacts with oxygen to form a sticky coating of aluminum oxide which is unaffected by water so prevent further corrosion .

Al + 2O = AlO2

GROUP DISCUSSION

Corrosion of automobiles cause millions of dollars of damage every year . Which parts of automobiles corrode most? How can car owner reduce the effect of corrosion?

WHAT CAN WE PREVENT CORROSION?

PREVENTING THE SURFACE OF METAL TO COME IN CONTACT WITH MOIST AIR

BARRIER PROTECTIONPAINTING, COATING WITH PLASTIC,

ENAMELING, GREASING, ELECTROPLATING WITH NON-

CORRODING METALS LIKE NI, CR AND COATING WITH ANTI RUST SOLUTION.

WHAT WE CAN DO TO PREVENT CORROSION?

COVERING THE SURFACE WITH A MORE REACTIVE METAL OR IT’S OXIDE

SACRIFICIAL PROTECTIONGalvanization – Covering with zink.

Tinning – covering with tinningAnodizing –Coating metals Al, Mg

which is made the anode with thick coating of its oxide.

RANCIDITY

WHAT IS RANCIDITY ?

The slow oxidation of oils and fats present in food materials resulting in bad odor and taste of food is called rancidity .

PREVENTION OF RANCIDITY

ADDING ANTIOXIDANTS

Compounds that prevent packaged , processed foods from becoming rancid due to oxidation of fats and oils which from harmful free radicals . Eg.BHA and BHT

ANTIOXIDANTS IN ACTION

AFTER BEFORE

OXIDATION OCCURS WHEN THE APPLE IS LEFT EXPOSED IN AIR

THE APPLE IS PROTECTED WHEN DIPPED IN ORANGE JUICE CONTAINING THE ANTIOXIDANT VITAMIN C.

PACKING OF N2 GASThe packed food is surrounded by the nitrogen

gas after flushing out oxygen to prevent oxidation and retard rancidity.

REFRIGIRATION

The low temperature in the refrigerator slows down the oxidation retarding rancidity.

STORING IN AIR TIGHT CONTAINER

An air tight container offers little exposure to oxygen and thus slows down rancidity.

STORING AWAY FROM LIGHT

Absence of light slows down oxidation of fats and oils and retards rancidity.

BIBLIOGRAPHYThis information has been taken from our science book and from website www.authorsream.com