Question

What is always true of a combustion reaction?

carbon dioxide will be produced

the reaction absorbs energy

oxygen gas must be one of the reactants

one reactant must contain carbon

Answer 1

Combustion is an exothermic reaction because it gives out heat
Complete combustion (given sufficient oxygen) of any hydrocarbon produces carbon dioxide and water but when oxygen is not enough to oxidize the hydrocarbon Carbon monoxide is formed.

Answer 2

http://en.wikipedia.org/wiki/Combustion it need not involve oxygen in combustion. so i go with one reactant must contain carbon

Answer 3

Thank you for you help and the website was help full! do agree will the 3rd option?

Answer 4

me too but when i read the info on Wikipedia i changed my mind although am not sure. Your most welcome :D

Answer 5

which one do you think it is now?

Answer 6

I go with the 3rd option

Answer 7

Yay. Thanks again

Answer 8

your welcome :)

Answer 9

ask more people am not sure

Answer 10

ok.

Answer 11

@thomaster can you please help me?

Answer 12

@Somy

Answer 13

http://chemistry.about.com/od/chemicalreactions/a/Combustion-Reactions.htm

Answer 14

O2 much be one of the reactants ALWAYS

Answer 15

@Abmon98 2Mg + O2 -> 2MgO
this is also combustion
and it does not have C

so O2 must be there.

Answer 16

@somy i understand what you re saying when i saw the info on Wikipedia i thought am incorrect and thank you :D

Answer 17

:3

Answer 18

Thank you!