laboratory preparation of methane
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Answers:You should have been able to find this in any good organic chemistry text. The number of methods makes listing each one too long for the format of this forum. The sites below should give you all of the information that you need:
Answers:1. To make it safer to handle and eliminate microcracks in the glass 2. This only applies to a stirrer made from tubing. Both ends are closed so that liquid cannot get into the tube and create cross-contamination 3. It spreads the flame so that the tube does not collapse at the bend point but instead bends smoothly over a greater length 4. PROTECT YOUR HANDS! If the tube breaks you could spear yourself. Fire polish the ends of the tube and lubricate with water or glycerin. Hold cork. stopper and tubing with towel.Rotate back and forward as you insert the tube. See Google Books: http://books.google.com/books?id=89w4kyQqQXcC&pg=PA394&lpg=PA394&dq=insert+glass+tubing+cork&source=web&ots=5paqHZ5oCI&sig=B771qMdINPyy6lqZoN0R_BCNreQ&hl=en&sa=X&oi=book_result&resnum=6&ct=result 5. To let it cool a little. Bending while still in the flame increases the possibility of collapsing the tube.
Answers:Clay triangle- It is used as a base to keep some apperatus(e.g. beaker,flask, etc.) on it while heating them. IF we keep apparatus directly on sand bath then the tem. will not uniform & also the apparatus will get break. due to the clay tringle. apparatus will get uniform heating surface as well as remain protected as it is not in direct contact with sand. Diff in Hrad & ordinary Tubes? The material of which it is made of create a difference in their properties.The so called hard contain greater % of silica so that it remain intact even on heating to a higher temp.as it has high resistance.On the contarary the ordinary test tubes are not meant to be heat at higher temp.(above 70 C) as they may get broken up. They are only for pbserving the reactions. a so the hard one also called as Borosil test tubes ar costlier. Water Bath- It serves the simple purpose of not to heat the substance above !00 C i.e. the boiling point of Water. It is use for control temp. reactions.(practically it gives temp. of upto 90 c only) Crucible & cover- It has the many uses. Basically it is used for heating the substances at very higher temp. & cover is simply to avoid any loss of material as well as to prevent external material to enter in.(for quantitative measurments) Mortar & pestle- It is same as the crusher which we use at home to prepare chutny and spices .it has the basic purpose of grinding or mixing the substances very finely,
Answers:Here's what I think the answer is: Acyl chloride's functional group is -COCl while carboxylic acid has -COOH Acyl chloride is very reactive because of the chlorine on the C=O (carbonyl carbon) which makes the structure very electronegative. Electronegativity is the ability of an atom to attract electron density towards itself (thus making it a very good electrophile). Carboxylic acids are polar and forms hydrogen bonding. If you compare the reactivity of this two, then acyl chloride is the better reagent because of the chlorine which in a way activates the the carbonyl group due to increased electronegativity. Hope this helps.. Ciao