Biology

Biology, 21.10.2019 19:50, amandasantiago2001

We should never keep volatile solvents, like as ether, acetone, or benzene in an open beaker or erlenmeyer flask because vapors can ignite and flash back if they reach a flame. all but one safety precaution is necessary when using volatile solvents. that is

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Chemistry, 16.07.2019 01:30, slippedsumo

Organic solvents like benzene, ether, and chloroform are neither protic nor strongly polar. what effect would you expect these solvents to have on the reactivity of a nucleophile in sn2 reactions?

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Chemistry, 18.07.2019 22:00, sharondot2398

Which is the best reason for using an erlenmeyer flask instead of another piece of glassware while filtering the cabbage solution? the erlenmeyer flask is the only container that can hold a liquid. the erlenmeyer flask's narrow mouth makes it easier to pour the solution. the erlenmeyer flask's narrow mouth can support the funnel and prevent breakage. the erlenmeyer flask is the only glassware that will accommodate a filter funnel?

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Chemistry, 08.08.2019 04:20, vhs35

In an erlenmeyer flask, prepare a quench mixture of 10 ml 10% sulfuric acid and about 10 grams of ice. carefully pour the reaction mixture into the flask containing the quench solution. rinse the reaction flask with some ether and 10% sulfuric acid and add these rinses to the erlenmeyer flask. swirl the mixture well and then transfer the solution to a separatory funnel. add enough ether to allow for a reasonable extraction. separate the layers and wash the organic layer with 10% sulfuric acid and then brine. be careful during these washes as pressure will build up quickly since ether is very volatile. be sure to vent the separatory funnel right away and frequently thereafter. dry the organic layer over magnesium sulfate, filter, and concentrate on the rotovap. consider all the possible molecular species that could be present at the end of this reaction. next, analyze the isolation procedure described to predict which species are in the aqueous and organic layers. in most cases you will observe (by tlc of your crude product) that you have unreacted methyl benzoate present. in many cases the amount of unreacted starting material is significant. if this is the case, you will be required to purify your product. what purification methods are available to you in this case? which one would be the most effective? which would be the fastest?

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Chemistry, 24.10.2019 17:43, chloerodgers56

Astudent was assigned the task of determining the identity of an unknown liquid. the student weighed a clean, dry 250-ml erlenmeyer flask. the student completely filled the flask with water. he then proceeded to weigh the flask containing the water. mass of 250-ml erlenmeyer flask: 78.639 g mass of 250-ml erlenmeyer flask and water: 327.039 g assuming the density of water is 1.00 g/ml at ambient temperature, what is the exact volume (in ml) of the 250-ml erlenmeyer flask?

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We should never keep volatile solvents, like as ether, acetone, or benzene in an open beaker or erle...

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