kjf

What is the pattern? AEFHIK BCDGJO Finish it off (For each line) Hint: Shape

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Hey everyone, I have to figure out what prac I'm going to do as the big assessment for this year. The text books we use have many pracs, but the teacher says we must go further than what's asked from the textbook. So, flipping through the pages I see rates of reaction. I get an idea. What I want to do, is a prac which incorporates two main ideas: How concentration affects rate of reaction How temperature.. So, I would compare the two. (have many test tubes) But essentially: Have a test tube with high concentration and low temperature (lets say room temp). Have another test tube with the opposite: low concentration and high temperature. The aim of the experiment would be to find a sort of ratio between concentration and temp. As M increases, T decreases eg: for 1M, T must decrease by 20 degrees. To obtain the same rate of reaction, as the concentration increases, temperature must decrease. So, I have two questions for you guys. 1. Do you think this is a good idea? It sort of combines two experiments from the text, AND goes further. 2. WOULD IT WORK? Would i be able to find a definite ratio? Any help/info would be appreciated. Thanks in advance KJF

Ah, sorry I didn't give you enough information. I wrote the answer before you guys replied, and this is what I came up with: Distilled water was added to the test tube before smelling due to two reasons – to dissolve the leftover acid and alkanol, and to make the ester form a layer on top of the substance. When regarding solubility, esters with a low number of carbons (generally four or less) are considered to be moderately soluble. As the number of carbon atoms increases, the solubility of that certain ester decreases. The soluble esters, usually with five or more carbons in a straight chain, tend to form a thin layer on the surface when water is added once the reaction has taken place. The excess acid and alkanol (the reactants) both dissolve in the added water because they are both soluble in water, and were tucked safely away under the layer of ester which formed. The water was added so this layer was formed, thus making the ester form a layer on top which in-turn intensifies the smell of the ester produced. I appreciate the replies though! I really like this forum.

Hey everyone, I just joined this forum, and I'm after a bit of help Okay, so I recently took part in a chem prac at school, and I'm doing the right up. There's a question I need to answer, and I can't find much info on it! So yeah, to the question: "Why was water added to the tube before you were asked to smell it? (hint: what was in the water layer in the test tube?)" I really don't know, and it's eating away at me! So, any help would be appreciated. Regrards, kjf