[sasan_f3000]

like this reaction:

C(s) + O₂(g) ----------> CO₂(g)

I said increasing temperature but not sure and how do we know if we can say increase concentration or mass, volume?

[nj_bartel]

Is that reaction endergonic or exergonic?

[sasan_f3000]

It didn't say anything about that. Only gave us the reaction.

[potatopotato]

i guess you can consider increase of concentration, since oxygen is a gas...just in case you wanna know, Increasing the concentration can mean increase of pressure for gas in this case.

If it is a gas, increasing the concentration allows more particles to react with the carbon to form the bonds needed (however, make sure you have the right orientation, right amount of Ea activation energy, etc.)

I think temperature is pretty important too since it would take too long for the oxygen in the air to react with the carbon.

[tudotudo]

temperature should work

[macman104]

Chemical reactions where two species come together usually require some sort of collision (these are called addition reactions).  In general adjusting any condition that increases the likelihood of a collision is going to increase your rate.

As you stated, if you increase the temperature, the oxygen atoms will move faster and the likelihood of collision increases.

If you increases the pressure by decreasing the volume, it means that the oxygen atoms will be more likely to come in contact with the solid carbon, as it is confined to a smaller space.

If you increase the amount of oxygen, then there is more of it, so more likely for a collision.

Likewise, if you increase the amount of carbon, there is more carbon to collide with, so it should increase the rate.

For these types of reactions, it is helpful to view the reaction as a collision, which coincidentally enough, is where the basics behind "Collision Theory" come from:  http://en.wikipedia.org/wiki/Collision_theory