engineerjoe

2 Second Chemistry Question Trying to theoretically boil 1 L of water in a closed container at 90 degrees Celsius and using the correlating boiling pressure for water at this temperature. In order to find the size of the container I tried using the Ideal Gas Law with the following variables: V = solving for this. P = .697 atm n = 55.6 moles/liter R = .0821 (L*atm)/(mol*K) T = 363.15 K The result shows a volume of 2378.3 L needed to carry out this experiment. I believe I have made a mistake. Surely water could be boiled in a smaller vessel, right?

Hello, I have been working on an idea for a class room model that would illustrate 2 topics of education: water cycles and liquid properties. The goal would be to place water in a chamber or series of chambers and apply a vacuum to lower the boiling temperature. A heat source less than 212 degrees F would be applied to boil the water and show the relationship between pressure and temperature and water phases. The water vapor would then condense and return to a liquid form and begin the cycle again demonstrating the water cycle. Research on this subject leaves me with two questions that I have been stuck on for over a week: 1. All examples I have found show applying a continuous vacuum to the apparatus in order to keep the pressure low when water vapor is being created. Is there any way to create a vacuum chamber and then ‘cap’ the system so it is self-contained and does not require leaving a vacuum pump running? What if the initial pressure was so low that the water vapor created did not increase the pressure significantly? What about mechanically expanding or compressing the chamber? 2. I have read about ‘de-gassing’ a liquid in a vacuum and my understanding of this is when the soluble air particles in the water are pulled out. This creates the appearance of boiling but it is deceptive and only lasts about 60 seconds. Once this stops, if the temperature is raised and the pressure is lowered will the water ‘boil’ or does degassing prevent boiling from happening? I appreciate all of your help on this subject. Chemistry was never my strong point in school and I am attempting to work with what little knowledge I have.

I would greatly appreciate if someone could provide advice or sources of information regarding design and construction of small turbines. I will be attempting to build one and would like it to be as efficient as possible. I have reviewed the basic formulas involved but cannot seem to find information regarding variables such as what gauge of wire to use, determining diameter of loops, viability of linking several small turbines in series, and other design criteria that must be addressed before materials can be purchased. Thank you in advance for any advice.

I am looking for information concerning CO2 conversion rates of plants, specifically small plants, fungi, etc. All I can find are statements that a mature tree can convert about 50 lbs. of CO2 a year, but this really doesn’t help me. Can anyone answer any of the following: 1. What small plants convert CO2 the fastest? 2. Is there some basic formula or rule that can be applied to find out how much CO2 a plant converts? 3. If you don’t know this off-hand, do you know where I can find this information? Thanks

Can the following reactions be reversed, and if so, how? 2 Ca2SiO4 + 5 H2O---> 3 CaO.2SiO2.4H2O + Ca(OH)2 + 58.6 kJ Tricalcium silicate + Water--->Calcium silicate hydrate+Calcium hydroxide + heat 2 Ca3SiO5 + 7 H2O ---> 3 CaO.2SiO2.4H2O + 3 Ca(OH)2 + 173.6kJ

What is the precise trigger for a cat to go into heat or come out of it? I understand the basics. What I am looking for specifically is the physiological reactions and brain chemistry changes. Does anyone know this or know where I can find it?

Hello, I am looking for some freeware that would allow me to take a scanned topography map and run a hydrolgy analysis. I would like to simulate a rainfall to see where the runoff accumulates. I have no budget for this which is why I am asking for freeware advice. I know the answer might be a complicated process involving several small programs. Any help would be appreciated. Thank you

Hello, I live in Alabama and am looking to find information on the fastest germinating weed or plant that will grow in the area. I cant seem to find any information on the internet. Everytime I google the word "weed" I get some interesting results, none of which are the ones I am trying to find. Any help on this would be greatly appreciated. Thanks

I am looking for some foam or rubber material that I can mold to a specific shape. The two main constraints I have for the material are as follows: it needs to work quickly (30 minutes or less) and form shape at room temperature. To be more specific I need to press a shape into the foam or rubber and have the material take the shape fast. The reaction can be exothermic but must not create so much heat it could cause a burn human skin. Does anyone know of a material like this? Does a product already exist that does this? Could I make it myself? Thank you