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So the dotpoint <meta http-equiv="Content-Type" content="text/html; charset=utf-8"><meta name="ProgId" content="Word.Document"><meta name="Generator" content="Microsoft Word 12"><meta name="Originator" content="Microsoft Word 12"><link rel="File-List"...

what are some of the advantages and disadvantages of using playdough to model addition of water to ethylene and dehydration of ethanol, and modelling the ionization of strong and weak acids p.s. doesn't have to be specific to playdough, could also refer to ball-stick models much appreciated

ok, so for my half yearly for chem there was a question where i had to describe a use of PVC and explain it in terms of its properties. i talked about PVC being used as a container for chemical substances- for some reason it was 3 marks and so i thought i should throw down everything i knew. so...

i guess this is a pretty general question, but i'm wondering how people have/are preparing for their practical task. i've written all my prac reports up- is it a matter of simply memorizing the methods and variables and equipment? ta.

1. find the locus of z, given t is a real variable: z = (2+it) / (2-it) 2. prove that: (|z|- iz) / (|z|+ iz) = -i(sec0+tan0) , where Re(z)is not equal to zero, and argz=0 NOTE: [0=theta] <!--[endif]--><!--[endif]-->