|MadSci Network: Chemistry|
Hello again, Is this right??? Physical Properties of Caffeine: Qualitative Physical Properties: · pure caffeine is a white, odorless powder · crystallizes into long, white needlelike crystals · the crystals loose their water of hydration slowly to give a white solid · neutral to litmus paper · bitter taste Quantitative Physical Properties: · molecular weight is 194.19g · melting point is 238 C (460 F) · point at which caffeine sublimes is 178 C (352 F) at atmospheric pressure · pH is 6.9 Chemical Properties of Caffeine · generally non-reactive · soluble in hot water · upon cooling, the solution deposits crystals of caffeine monohydrate Are they in the right spot, I'm having trouble differentiating between physical and chemical properties. Please respond, thanks a lot!!! ~Kim
Re: How do u differente between physical and chemical properties PLEASE READ!!!
Try the links in the MadSci Library for more information on Chemistry.