Biology; Chemistry; Physics: Post your doubts here!

[haj.arsh]

plzz rply to my question....

 

[Zain Amjad]

Hey
I need notes of Chemistry related to Kinetic Theory and Isotopes for making Word Processed Assignment.

 

[scouserlfc]

AOA...i recently heard that there will be no more combined sciences papers...is that true...???...please help me...em confused..!!

Do u know the subject code of your subject is it 5129 or 5130

BTW if this is what u are taking then its available
http://www.cie.org.uk/qualifications/academic/middlesec/olevel/subject?assdef_id=935

 

[Mando]

Just by telling Electricity we wouldn't know because its too broad..are you actually having problems with the whole main topic? or do you have specific areas?! and Chemistry moles what do you not know about it?

nothiing at all

 

[scouserlfc]

nothiing at all

Cmon u must know atleast something,read the book again if u still say no and then come back remember to pay attention to the book and concentrate on it

 

[Mando]

Cmon u must know atleast something,read the book again if u still say no and then come back remember to pay attention to the book and concentrate on it

thanks dude

 

[aneeq247]

Can anyone please explain the Star Formation Theory to me. Any help is appreciated.

 

[SalmanPakRocks]

Here.

 

[Spidey21]

and this thread was active when i was not here...!@#$

 

[Mando]

Here.

wat will this help me in ?

 

[SalmanPakRocks]

wat will this help me in ?

Star Formation? :S

 

[Mando]

Star Formation? :S

wat will start formation help me in ?

 

[Mando]

Star Formation? :S

 

[scouserlfc]

wat will start formation help me in ?

Dude this is a topic in Physics and u wanted help in it so he posted the notes
So now do u want us to explain it,not a problem but do ask if u want

 

[Mando]

2Mg + O2 → 2Li2O
(Magnesium) (Oxygen) (Magnesium Oxide)

 

[Mando]

2Mg + O2 → 2Li2O
(Magnesium) (Oxygen) (Magnesium Oxide)

is correct ?

 

[KyleoAhsan]

is correct ?

Wrong ! magnesium + oxygen will give a white powder of magnesium oxide !

2Mg + O2 ---> 2MgO not 2LiO

 

[incognitive lass]

anyone plz show me how to create a balancedequation and explain it too plz

 

[Spidey21]

anyone plz show me how to create a balancedequation and explain it too plz

umm....give us an example so that we can do that one for you..an example that your probably got confused with

 

[KyleoAhsan]

anyone plz show me how to create a balancedequation and explain it too plz

A balanced equation depends on few things, like how the metal is bonded, its valency,
Ensure that the number of atoms in the left side of the equation and at the right side of the equation are same.
Example :- C6H14 + O2 ===> CO2 + H2O
Above we have on the left side of equation [ 6 - carbon atoms 14 - hydrogen atoms and 2 - oxygen atoms ]
And on the right side of the equation [ 1 - carbon atom 2 - hydrogen atoms 3 - oxygen atoms ]
So it is obviously not balanced. To balance we can either use trial and error method or any method that suits you!

2C6H14 +19O2 ===> 12CO2 + 14H2O

we always try to get a whole number in front of the compounds, as you can see we have O2 on the other side, we can simply balance the equation if we can get a whole number on the right side of the equation.