Biology, 21.09.2019 07:50 erenackermanlevijaeg

What are the advantages of using a solvent pair for recrystallization? select all that apply.
a you can control the solubility of the substance in the mixed solvent.
b you don't have to know the exact amounts of the solvents needed.
c you can quickly make the solution supersaturated by adding more of the solvent with less dissolving power.
d you can quickly make the solution supersaturated by adding more of the solvent with greater dissolving power.
e you can calculate the precise amounts of the solvent needed for recrystallization.
i chose b and e but got it wrong. i'm not sure if it's because i chose the wrong ones, or i didn't choose all of the correct answers.
i've looked through my notes and textbooks many times, but i'm still a bit confused about this. ! ?

Answers: 1

Show answers

Another question on Biology

Biology, 22.06.2019 03:00

The term equestrian relates to which animal? bulls cows horses pigs

Answers: 2

Answer

Biology, 22.06.2019 09:00

Which best describes this behavior? it is beneficial only to the males that do not fertilize eggs. it is beneficial only to the female workers that are not fertilized. it is beneficial to each one of the individual colony members. it is beneficial to the whole species, but not to all of the individual members.

Answers: 2

Answer

Biology, 22.06.2019 09:00

Amarine ecologist has constructed the conceptual model shown in the diagram. what predictions can be made from using this model? where the tertiary consumers get their energy how often primary producers are able to reproduce when bacteria and fungi initiate the process of decomposition whether other secondary consumers are present

Answers: 2

Answer

Biology, 22.06.2019 13:00

Astudy by solloch and et. al., in 2017, gives the map above which shows the frequency of alleles with a ccr5-delta32 mutations over 87 different countries. this mutation deletes the presence of a co-receptor (ccr5) on the outside of human t-cells (lymphocytes). some viruses, such as the one responsible for the black death and human immunodeficiency virus (hiv), require this receptor for attachment to host cells during the infection process. the black death was an epidemic that passed over northern europe during the 14th century killing nearly 60% of europeans. according to this information, which explanation best explains why northern europeans show a greater immunity for hiv than some other parts of the world?

Answers: 1

Answer

You know the right answer?

What are the advantages of using a solvent pair for recrystallization? select all that apply.

Questions