I point
Given the ionization constant equation:
Kw = [H+][OH-]=1.0 x 10-14
For water at 25°C, which statement is true?
1) [H+] = [OH-]
2) [H+]> [OH-]
3) [H+] = 1.0 10-14 M
4) [OH-] = 1.0 × 10-14 M

The ionization constant equation is:

=1.0 × at 25°C

the option is 1.

Explanation:

Sometimes in pure water one proton of the water molecule(hydrogen ion) will get attracted to the lone pairs present in another water molecule.This causes the hydrogen ion to leave the present water(leaving the behind) molecule ad gets attached to another water molecule leading  to the formation of the hydronium ion(,hydronium ion).

This process is called auto-ionization of water because the water molecule ionizes into and ions.

As such the equilibrium constant,which is measure of concentration of products to concentration of reactants,will be very slow.

∴the ionization constant of water at 25°C is 1.0 × .

(i.e.)option c is correct answer []=[]

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.