Wednesday, 15 January 2014

Acids and bases .....

Acids and Bases   

Introduction :
      By the 15th century , chemists recognized a group of substances which had sour taste called Acids (In Latin acidus meaning "sour"). They also recognized another group of substances which had bitter taste and were used as good cleaning agent ,called Bases.
       In 16th century, it was recognized that bases react with acids to 'destroy' or "neutralize" them,forming an ionic compound called salt .
       Nearly all fruits and foods contain acids.All citrous fruits contains large amount of ascorbic acid(C6 H8 O6) or vitamin C.Ascorbic acid also acts as an anti-oxidant .Apples contain maleic acid.The souring of milk produces lactic acid,butter on rancidity gives butyric acid.The extract of vinegar is acetic acid .Chemists prepare large quantities of important industrial acids.They are manufactured from minerals and are known as inorganic acids or more commonly mineral acids.
    

Properties of Acids and Bases :

Acids:
1:Acids have sour taste .
2:They change the color of blue litmus into red .
3:Aqueous acid solutions,conduct electricity .
4:They react with bases to form salt and water .

Bases:
1:Bases have bitter taste .
2:Bases have slippery touch .
3:They change the color of red litmus into blue .
Aqueous solution of bases,conduct electricity .

Acids and Bases (Arrhenius Theory):

        Svante-Arrhenius , a Swedish chemist in (1887) first gave the clue to chemical nature in his theory of ionization .It states that an acid can be difined as a substance that yields (H+) ions when dissolved in water and base can be defined as a substance that yields (OH-) when dissolved in water .
        Arrhenius acid  HCL(aq) -----------------H+(aq)+cl-(aq)
        Arrhenius base NaOH(aq -----------------Na+(aq)+OH-(aq)

Tuesday, 14 January 2014

A Dreadful Accident - My school essay

An Accident is when two vehicles i.e cars,trucks,buses,vans etc are collided to each other and in this type of thing they suffer from a great loss of car's parts and if a man is injured the payment for his treatment in the hospitals .

This is about an accident which happened when me and my family were going to my village from Karachi to Mirpur Khas in a coach. We passed Karachi and Super Highway and when we were in Hyderabad a bus came from other side it was dark and the other bus had bright lights so our driver blinked his eyes for a second and lost control of the steering and bus collided with the other bus Our bus did not have any type of loss but the other bus was badly broken and the driver also died ..

I wish Allah save everyone from these type of accidents ..
                         
                                                                   (Ameen)
this is a photo of that accident ..
 Regards Momin Panhwar ..

Eid Milad-un-Nabi ..

Hello ..

My this post is on the topic of Eid Milad-Un-Nabi . This is the most important and peaceful festival of Islam .On this date our Holy Prophet (Peace Be Upon Him) was born and everybody knows how we love them and we do according to the Sunnah .The word Sunnah means (Way Of Life) .Sunnah means all the things which our Holy Prophet (S.A.W) used to do in his normal and domestic life ..

Eid Milad-un-Nabi Mubarak to all the people who are reading this post ..

Regards:Momin Panhwar ..

Monday, 13 January 2014

This is my first post

Hello world ..

My name is Momin Panhwar . I study in The Wendy School Karachi in nineth grade .. I am good at reciting naats , in playing cricket and in acting .. I als love to hear and sing song weather those are Indian , Pakistani , or Western .. And i love to hear songs in loud voice .. This is my first blog ..

Firstly , I will tell you about today when i went to Numaish area (Karachi,Pakistan) .. Because of the great day of Eid Milad-Un-Nabi and the other purpose to go there was that Pakistan have made a World's Record of Lighting 13000 oil lamps which are called in Pakistan (Diya) .. There were brilliant fireworks and approximately 10000 people came there some were drinking coffee and i cant explain you the condition out there .. but no matter what i had fun there in the firewrks and i was really shoked when i saw that 13000 lamps were lighted ..
This is a picture which i took from Samma Tv ..

Regards Momin Panhwar .. :)