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Chemistry, 04.09.2020 23:01 ssollers

WILL MARK THE BRAINLEST Please choose the best description, or definition of Faunal Succession. Question 2 options: principle stating that specific groups of organisms lived and died within a specific time frame due to the ice age principle stating that specific groups of fawns lived in a specific region and are found in the rocks shoing fawns onl live in specific areas. principle stating that specific layers of the earth have contain fauna of different types showing biodiversity. rinciple stating that specific groups of organisms have followed, or succeeded, one another in a definite sequence through Earth history

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Straightforward questions answered in the powerpoint slidesreaction: heating the starting materials under refluxwhat does it mean to heat under reflux? why do we choose water as the reflux solvent? what are boiling chips used for? why do we put a condenser on top of the reaction? why do we add heat and let the reaction stir for 30 minutes? why do we add sulfuric acid to the reaction after it cools as opposed to when it’s still hot? separation: filtration of precipitatewhy don’t we do an aqueous and organic extraction in the separatory funnel? why do you rinse the salicylic acid on the filter with ice cold water? purification: recrystallization of salicylic acid (no hot filtration needed)what is the difference in the amount of room temperature water vs. boiling water needed to dissolve the salicylic acid (assume a 1.2 gram yield of salicylic acid)? remember, in the lab if you need x ml of boiling water to dissolve a solid, then you should add a little more (definitely no more than 1.5 times the theoretical amount) to ensure it doesn’t recrystallize prematurely.analysis: melting point of salicylic acidwhat can you conclude if the melting point of the salicylic acid you just synthesized is 152-155oc and the 1: 1 mix of your product and “synthetic” salicylic acid is 151-154oc?
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