A0.1 m solution enatiomerically pure chemical compound d has an observed rotation of 0.20 degrees in a 1 atm sample container. the molecular mass of the compound is 150.
a. what is the specific rotation of d? (i already know this part )
b. what is the observed rotation if this solution is mixed with an equal volume of a solution that is 0.1 m in l, the enantiomer of d?
c what is the observed rotation if the solution of d is diluted with an equal volume of solvent?
d what is the specific rotation of d after the dilution described in c?

What is the specific rotation of L, an enantiomer of D? the same than D but opposite sign. f. What is the observed rotation of 1 L of solution that contains 0,01 mole of D and 0.005 mole of L? (Assume 1 dm path length) calculate the difference between the two enantiomers 0.01 D- 0.05 L = 0.05 M "D" specific rotation = observed rotation/ (cell path x concentration) cells path = 1dm (doesn't affect anything in the formula we can ignore it) observed rotation = specific rotation D x concentration D

Answer: abeexplanation:

1. the question asks the most appropriate, which seems to rule out "all of the above." your choice appears to be the correct one.

2. the protocol described is good for identifying correlation, but not cause and effect. for cause/effect, you need to devise a protocol that will assign the treatment (or not) to groups that have essentially the same "demographics" with respect to all the other variables. your choice regarding control group seems appropriate. random assignment of treatment (choice d) may be appropriate also. (i think you can argue that b and d are just different descriptions of the same method.)

3. d will randomize the birds, but may not guarantee there are 10 in each group. e will do both, so seems the better choice.

comment on question 2

based on the problem statement, it seems clear that confident, attentive drivers are more likely to use daytime running lights. so, the protocol might need to be devised in such a way that the lights would be turned on or off without the driver's knowledge. (an attentive driver will figure it out.) assigning a confident, attentive driver to a group required to drive without running lights might mess with his/her confidence and attentiveness. you don't want your experiment to do that. (nor do you want the experiment to subject a driver to greater risk of accident as a consequence of driving without running lights.) experiments involving human safety are always problematic.

Read the sentences below in 1962, i tried to enroll as the first black student at the university of mississippi. the governor of mississippi blocked my entrance which best describes the verbs used in the sentences? o they are past tense verbs, which are often used in narrative essays o they are past tense verbs, which are not often used in narrative essays. o they are future tense verbs, which are often used in narrative essays o they are future tense verbs, which are not often used in narrative essays.