Combustion - Is water liquid or gas?

[ForUs_J&S]

Hi everyone,

It's 2AM, and I am up for some reason. My mind is jumbled at this point, so I'm hoping you can explain some concepts for me! I've searched online but my findings are inconsistent with the explanations in the Destroyer.

Gen Chem
#157. In a combustion reaction, a hydrocarbon in the presence of oxygen gas produces water and carbon dioxide gas. Is the water product liquid or gas? The Destroyer states that it is a liquid but online sources state that it's a gas. If you burn something, you never see any water (or maybe you just can't see it?).

#183. The question provides a bunch of elementary steps and asks which step would least likely occur.
A) X + Y -> Z
B) 2X + Y -> Z
C) 2X + 2Y -> W + Z
D) 2X -> X + Y
E) 2X + Y -> 2W + Z

The answer is C because a "reaction will occur when there is a collision. The more reactants involved the less likely for a fruitful collision, since C has 4 reactant a fruitful collision will not likely occur."

I thought the more reactants, the more collisions. So, what gives?



On another note, Chad's videos says that I don't need to know mass spectrometry as well as any complex Diels-Alder reactions. However, I am seeing a few in the Destroyer and Bootcamp. Is Chad's outdated? Do I need to know these? I, of course, am hoping I don't since there is more than enough to learn in the first place!


Thank you guys in advance! I'm going to go back to improving from my 20% performance in Destroyer OChem!

---

Members don't see this ad.

 

[mouse rat]

Hi everyone,

It's 2AM, and I am up for some reason. My mind is jumbled at this point, so I'm hoping you can explain some concepts for me! I've searched online but my findings are inconsistent with the explanations in the Destroyer.

Gen Chem
#157. In a combustion reaction, a hydrocarbon in the presence of oxygen gas produces water and carbon dioxide gas. Is the water product liquid or gas? The Destroyer states that it is a liquid but online sources state that it's a gas. If you burn something, you never see any water (or maybe you just can't see it?).

#183. The question provides a bunch of elementary steps and asks which step would least likely occur.
A) X + Y -> Z
B) 2X + Y -> Z
C) 2X + 2Y -> W + Z
D) 2X -> X + Y
E) 2X + Y -> 2W + Z

The answer is C because a "reaction will occur when there is a collision. The more reactants involved the less likely for a fruitful collision, since C has 4 reactant a fruitful collision will not likely occur."

I thought the more reactants, the more collisions. So, what gives?



On another note, Chad's videos says that I don't need to know mass spectrometry as well as any complex Diels-Alder reactions. However, I am seeing a few in the Destroyer and Bootcamp. Is Chad's outdated? Do I need to know these? I, of course, am hoping I don't since there is more than enough to learn in the first place!


Thank you guys in advance! I'm going to go back to improving from my 20% performance in Destroyer OChem!

For #157, was there any temp or pressure given? I've seen this conflict before, and it seems that those two variables may be what determines water's state.

For #183, the answer is C because each of the four reactants has to be oriented in a specific way when they collide, which will then allow them to react. It's more likely for two or three reactants to be oriented correctly as opposed to the probability of four being in the correct orientation.

 

[DATGod001]

🙂 Yes, I highly recommend knowing Diels-Alder... 😉

 

[ForUs_J&S]

For #157, was there any temp or pressure given? I've seen this conflict before, and it seems that those two variables may be what determines water's state.

For #183, the answer is C because each of the four reactants has to be oriented in a specific way when they collide, which will then allow them to react. It's more likely for two or three reactants to be oriented correctly as opposed to the probability of four being in the correct orientation.

For 183, there was no temperature or pressure given. It asked the reader to select which reactant was false.

The choice was:
Hydrocarbon (g) + O2 (g) -> CO2 (g) + H2O (l)

 

[ForUs_J&S]

🙂 Yes, I highly recommend knowing Diels-Alder... 😉

Well I know how to react a ethylene and a cis-1,3 butadiene, but don't remember how to determine if substituents are cis, trans, and things like that. TT

 

[Lnguyen7]

Hi everyone,

It's 2AM, and I am up for some reason. My mind is jumbled at this point, so I'm hoping you can explain some concepts for me! I've searched online but my findings are inconsistent with the explanations in the Destroyer.

Gen Chem
#157. In a combustion reaction, a hydrocarbon in the presence of oxygen gas produces water and carbon dioxide gas. Is the water product liquid or gas? The Destroyer states that it is a liquid but online sources state that it's a gas. If you burn something, you never see any water (or maybe you just can't see it?).

#183. The question provides a bunch of elementary steps and asks which step would least likely occur.
A) X + Y -> Z
B) 2X + Y -> Z
C) 2X + 2Y -> W + Z
D) 2X -> X + Y
E) 2X + Y -> 2W + Z

The answer is C because a "reaction will occur when there is a collision. The more reactants involved the less likely for a fruitful collision, since C has 4 reactant a fruitful collision will not likely occur."

I thought the more reactants, the more collisions. So, what gives?



On another note, Chad's videos says that I don't need to know mass spectrometry as well as any complex Diels-Alder reactions. However, I am seeing a few in the Destroyer and Bootcamp. Is Chad's outdated? Do I need to know these? I, of course, am hoping I don't since there is more than enough to learn in the first place!


Thank you guys in advance! I'm going to go back to improving from my 20% performance in Destroyer OChem!

157. For combustion H2O is in liquid state
183. Explained by mouse rat

 

[DAT Destroyer]

Hi everyone,

It's 2AM, and I am up for some reason. My mind is jumbled at this point, so I'm hoping you can explain some concepts for me! I've searched online but my findings are inconsistent with the explanations in the Destroyer.

Gen Chem
#157. In a combustion reaction, a hydrocarbon in the presence of oxygen gas produces water and carbon dioxide gas. Is the water product liquid or gas? The Destroyer states that it is a liquid but online sources state that it's a gas. If you burn something, you never see any water (or maybe you just can't see it?).

#183. The question provides a bunch of elementary steps and asks which step would least likely occur.
A) X + Y -> Z
B) 2X + Y -> Z
C) 2X + 2Y -> W + Z
D) 2X -> X + Y
E) 2X + Y -> 2W + Z

The answer is C because a "reaction will occur when there is a collision. The more reactants involved the less likely for a fruitful collision, since C has 4 reactant a fruitful collision will not likely occur."

I thought the more reactants, the more collisions. So, what gives?



On another note, Chad's videos says that I don't need to know mass spectrometry as well as any complex Diels-Alder reactions. However, I am seeing a few in the Destroyer and Bootcamp. Is Chad's outdated? Do I need to know these? I, of course, am hoping I don't since there is more than enough to learn in the first place!


Thank you guys in advance! I'm going to go back to improving from my 20% performance in Destroyer OChem!

157) The products of the combustion of a Hydrocarbon is Co2 gas and a water vapor. Then however water vapor condenses and becomes a liquid.

153) You must consider the Le Chatelier's principle of equilibrium here. If you observe more Products and less reactants, reaction occurred and equilibrium is shifted to the right.
However, if you observe more reactants, the equilibrium is shifted to the left, which will lead to the less fruitful collision, because it will make less products.

Hope this helps.