Nov
9
How do I decrease the viscosity of biodiesel?
Filed Under Chemistry | 2 Comments
Zeuski asked:
I need to decrease the viscosity of B-99.9 biodiesel with common alcohols/surfactants. I’ve tried isopropyl rubbing alcohol, and it works well. Everything else, however has too high of a water content to mix with the fuel.
LONNIE
I need to decrease the viscosity of B-99.9 biodiesel with common alcohols/surfactants. I’ve tried isopropyl rubbing alcohol, and it works well. Everything else, however has too high of a water content to mix with the fuel.
LONNIE
Aug
14
Water = Hydrogen + Oxygen. Water is abundant on earth. Why can’t we use watner to make hydrogen and oxygen?
Filed Under Chemistry | 4 Comments
Sooraj Kumar asked:
Both are useful. Oxygen for breathing and for increasing ozone layer. Hydrogen to use as a pollution free fuel.
ROY
Both are useful. Oxygen for breathing and for increasing ozone layer. Hydrogen to use as a pollution free fuel.
ROY
Mar
15
why does water put out a fire?
Filed Under Chemistry | 2 Comments
Leroy J asked:
I know that water smothers the flames, but it has free oxygen in it, which is why fish can breathe water. This is different from what I am calling bonded oxygen. I checked around for the answer to this, but it was talking about the bonded oxygen atoms in a water molecule.
I know that water smothers the flames, but it has free oxygen in it, which is why fish can breathe water. This is different from what I am calling bonded oxygen. I checked around for the answer to this, but it was talking about the bonded oxygen atoms in a water molecule.
I hypothesized that the evaporative cooling effect of water would reduce a fuel’s temperature to below ignition temperature. But then I considered the case of throwing liquid oxygen on a bonfire. This would be extremely cold and evaporate very quickly, which would result in rapid heat loss. Yet I common sense tells me there would be a huge combustion.
Cheesus, let me clarify. I am asking why the FREE oxygen in water does not combust with wood.
Free oxygen is dissolved in the water, not bonded.
MOHAMMED
Jan
20
Which fuel has the most favourable enthalpy of combustion per carbon atom?
Filed Under Chemistry | 3 Comments
Jason Kim asked:
a. ) methane
b. ) ethane
c. ) methanol
d. ) ethanol
e. ) water
I know that water is not the answer for sure since it has no carbon..
I dont know about this question, plz help!
MOISES
a. ) methane
b. ) ethane
c. ) methanol
d. ) ethanol
e. ) water
I know that water is not the answer for sure since it has no carbon..
I dont know about this question, plz help!
MOISES
Jan
9
elenacondriuc asked:
A chemical engineer studying the properties of fuels placed in 1.500 g of a hydrocarbon in the bomb of a calorimeter, and filled it with O2 gas. The bomb was immersed in 2.500 L of water and the reaction initiated. The water temperature rose from 20.00 C to 23.55 C. If the calotimeter (excluding the water) had a heat capacity of 403 J/K, What is the heat of combustion (qv) per gram of the fuel?
JAE
A chemical engineer studying the properties of fuels placed in 1.500 g of a hydrocarbon in the bomb of a calorimeter, and filled it with O2 gas. The bomb was immersed in 2.500 L of water and the reaction initiated. The water temperature rose from 20.00 C to 23.55 C. If the calotimeter (excluding the water) had a heat capacity of 403 J/K, What is the heat of combustion (qv) per gram of the fuel?
JAE

















