Now dilute 10.0 ml of the 0.50 m nacl by adding distilled water until 100 ml of solution are produced.

do the 100 ml of diluted nacl have more, less, or the same quantity of nacl as the original 10.0 ml of 0.50 m nacl?

more
less
the same

the same

Explanation:

According to the dilution law,

where,

= molarity of stock solution = 0.50 M

= volume of stock solution = 10 ml= 0.01 L  (1L=1000ml)

= molarity of resulting solution = ? M

= volume of resulting solution = 100 ml = 0.1 L

Therefore, the Molarity of resulting solution is 0.05 M

1. when volume is 10 ml or 0.01L   (1L=1000ml)

moles of

2. when volume is 100 ml or 0.1L   (1L=1000ml)

moles of

Thus they contain same amount of .

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.

i wish i could but this one is weird give me abc and i can solve it.