Chemistry, 22.10.2020 19:01 loveuncondition
Beta-carotene and lutein are carotenoids. What is the primary color that they absorb (and therefore not reflect)
Answers: 2
Chemistry, 22.06.2019 08:00
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?
Answers: 1
Chemistry, 22.06.2019 22:30
Molecular iodine, i2(g), dissociates into iodine atoms at 625 k with a first-order rate constant of 0.271 s−1. part a part complete what is the half-life for this reaction?
Answers: 3
Chemistry, 23.06.2019 09:30
Large crystals are formed when igneous rocks cool very slowly igneous rocks cool very quickly sedimentary rock is eroded metamorphic rocks change into igneous rock
Answers: 1
Beta-carotene and lutein are carotenoids. What is the primary color that they absorb (and therefore...
Geography, 31.01.2020 20:46
History, 31.01.2020 20:46
Mathematics, 31.01.2020 20:46
Physics, 31.01.2020 20:46
English, 31.01.2020 20:46
Mathematics, 31.01.2020 20:46
Mathematics, 31.01.2020 20:46
Geography, 31.01.2020 20:46
Business, 31.01.2020 20:46
Physics, 31.01.2020 20:46
History, 31.01.2020 20:47