Equations (1 Viewer)

[countrydude]

Gday, well i have been just doing a few exercises out of surfing chemistry, the acidic environment Page 5, on calulating volumes etc..

And im havin a bitta trouble

The question goes like this:

788kg of methane undergoes complete combustion.

a)Write an equation for this reaction

this is what i thaught it would be:

CH4 + O2 ----> CO2 + H4

But in the answers it is :

CH4 + 2O2 ----> CO2 + 2H2O

HOW DO YOU KNOW WHAT THE PRODUCTS WILL BE????

i can never really get the products right, i ask my teacher and he dosn't make much sence.

it sounds like a simple question, but im a dumass at chemistry

So can anybody help me?? thanks

 

[mannnnndy]

Whenever any hydrocarbon (anything with H atoms and C atoms) is undergoes complete combustion (ie reacted with oxygen) the products will ALWAYS be water vapour and carbon dioxide gas. If the combustion is incomplete then there will also be some soot (solid carbon) formed.

If theres any other equations you're having trouble with Im more then happy to help.

 

[kini mini]

IAW man^5dy. BTW H4 doesn't exist .

 

[countrydude]

thanx

Thanks mate

Are there any other rules like that i should know of?

cauz i suck at equations... thanks

 

[Twintip]

Originally posted by mannnnndy
If the combustion is incomplete then there will also be some soot (solid carbon) formed.

And carbon monoxide (CO) too.

 

[mannnnndy]

Originally posted by Twintip
And carbon monoxide (CO) too.

Whoops! forgot that one thanx 4 that

 

[abdooooo!!!]

Originally posted by countrydude


Are there any other rules like that i should know of?

there are many rules like that in chemistry, you just have find them in the text books and learn them one by one; i think most are straight foward and logical if you know the basics well like balancing the equation and why chemicals undergo reactions, etc...

 

[elizabethy]

Originally posted by countrydude
Gday, well i have been just doing a few exercises out of surfing chemistry, the acidic environment Page 5, on calulating volumes etc..

And im havin a bitta trouble

The question goes like this:

788kg of methane undergoes complete combustion.

a)Write an equation for this reaction

this is what i thaught it would be:

CH4 + O2 ----> CO2 + H4

But in the answers it is :

CH4 + 2O2 ----> CO2 + 2H2O

HOW DO YOU KNOW WHAT THE PRODUCTS WILL BE????

i can never really get the products right, i ask my teacher and he dosn't make much sence.

it sounds like a simple question, but im a dumass at chemistry

So can anybody help me?? thanks

hey whenever a hydrocarbon reacts undergoes complete combustion , the products r always carbondioxide and water

 

[ND]

Re: Re: Equations

Originally posted by elizabethy


hey whenever a hydrocarbon reacts undergoes complete combustion , the products r always carbondioxide and water

Combustion will not go to completion if there is not enough oxygen.

 

[abdooooo!!!]

isn't it also when a molecule contains lots of atoms it will less likely go to completion when it is combusted, because oxygen cannot reach it all in the short time of combustion.

 

[Twintip]

Don't think so. I think it's only a problem when oxygen is a limiting reagent.

 

[abdooooo!!!]

my teacher told me that when we were doing the combustion experiment, i don't know if he is correct or not