Question

which statements are true and false a) Always distill to the dryness of mixture b) Aluminum foil is wrapped around fractional column so that no heat loss takes place c) Heat the system fast and increase tempt after awhile Group of answer choices F, T, F T, T, T T, T, F T, F, T

Answer 1

1st false because we know the Never distill to dryness. The residue left in the distillation flask may contain peroxides, which could ignite or explode after all the liquid has distilled aways.

The distilling column is packed with a copper mesh to aid in the separation and to increase the number of theoretical plates. Because the distilling path is longer, heat loss is greater in the fractional distillation, so it is helpful to wrap slightly crinkled aluminum foil loosely around the column to insulate the column from drafts and to help keep the heat in. This helps to provide the heat necessary to distill the material through the apparatus at a steady rate. So we can say that 2nd statement is Almost true.

One of the major effects of heat transfer is temperature change: heating increases the temperature while cooling decreases it. We assume that there is no phase change and that no work is done on or by the system. Experiments show that the transferred heat depends on three factors—the change in temperature, the mass of the system, and the substance and phase of the substance. So 3rd is also false because not necessary that if we provide heat fast then temperature also increase.

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