Recent content by BayernBlues

[Post edited by Ivan] I've heard that the intense radiation from the Van Allen belt would make it impossible to travel to the moon or send anything to Mars etc. It's obviously possible to have satellites or the ISS (which is only I think 330 miles above us). People say that the radiation from...

You guys should have a listen to this if you want info on the origins of Halloween. It's a radio show on Toronto, on every Saturday night. He's done past shows on Halloween a couple times, this one is from last week: A View From Space w.Gary Bell aka Spaceman - Saturday October 31st 2009 Topic...

Homework Statement I have a first order reaction where I need to find the rate constant. I have the following data: T = 30'C the slope of a graph with ln O.D vs T (minutes) is -0.008 so k is 0.008. The Attempt at a Solution I'm unsure about what reaction I would need here. This is...

Homework Statement Find the enthalpy of ionization of the weak acid, ΔH3 H3O+ + OH- <-> 2H2O....ΔH1 HA + OH- + H2O <-> A- + 2H2O...ΔH2 HA + H2O <-> H3O+ A-...ΔH3 The Attempt at a Solution I won't show it here but I've found ΔH1 to be -52.33 kJ/mol and ΔH2 to be -5.21 kJ/mol. I...

Homework Statement Hydroxylammonium chloride reacts with Iron(III)chloride (FeCl3) in solution to produce Iron(II)Chloride, HCL, H2O, and a compound of nitrogen. It was found that 2.0 g of iron(III) chloride reacted in this way with 31 mL of 0.200 M hydroxylammonium chloride. Suggest a...

Ok forget that. why would the concentration of H2O be ignored in a rate law reaction?

Homework Statement For a lab, I need to find the activation energy of an experiment from plotting the Arrhenius plot. I have the half-life time of the reaction at various temperatures. Homework Equations -Temperature (K) 318 322 327 331 338 -ln k -6.17 -5.89 -5.65 -5.33...

yep, my first graph looks like that and I have the equivalence point from the derivative of that graph. I'm supposed to use a different mothod to find Ka though using this equation: Ka = [H+][A-]/[HA] I'm unsure though how to find what [H+] and [A-] would be at the equivalence point. I can...

Homework Statement Need a little help on a lab. I have all the data for a titration of a weak acid with NaOH which includes the pH of the acid for however many mL of NaOH added. I've plotted a pH vs V NaOH added graph. From that, I plotted a ∆pH/∆V vs V NaOH added graph. From this, I found...

If I fix sqrtF/2L then can I use n (harmonics) for the x values? Also, would the slope of the graph equal 1/u?

Homework Statement This is for a lab involving a rope being tied to a frequency generator on one end and a mass string on the other (creating tension on the rope) in order to create standing waves. I have to find the u (linear mass density which is kg/m for a rope by plotting it. This is...

so I'm guessing then that there isn't a reaction? because judging from what you said, the only thing I can think of is: HCN + HF ------> HCF3 + NH3

Hcn + Hf --> ? Homework Statement -What do HCN + HF form? (I've googled the reaction, can't find anything). -Also, what're 3 good characteristics of an acid-base indicator? Homework Equations The Attempt at a Solution I know it's an acid-base reaction. I'm guessin something...

Homework Statement So I need to find the values for local acceleration and frictional force due to a pulley system using the equation below. After graphing acceleration for various ∆mass vs acceleration using Excel, I get the following equation: y = 0.0144x - 0.0875 I don't understand...

Homework Statement 140 gram mass & a 110 g mass are connected by a masless string passin over a massles pully which has a frictional resist. f=0.147 N when M (total weight of 2 masses) = 250 g. -What's the acceleration of the system after release? -How far does the 140 g mass fall during...