According to the collision theory of chemical reactions, an increase in the number of effective reactant collisions per unit time will increase the rate of the reaction.

true
false

you can study reaction rates to answer which of the following questions?

will the reaction go to completion?
will the reaction occur?
how can the reaction be slowed down?
how many grams of product will be made?

changing the concentration of one or more of reactants can affect the rate of a reaction.

true
false

if the surface area of reactants decreases:

the reaction rate is generally lower.
the reaction rate is generally higher.
the reaction rate is not affected.
the effect on reaction rate cannot be predicted.

which of the following would increase the rate of a chemical reaction?

reducing the temperature
increasing volume
using reactants in fine, powder form, rather than large, chunky form
decreasing reactant concentration

in an energy diagram for an endothermic reaction, the products are higher in energy than the reactants.

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false

a catalyst works by increasing the activation energy needed for a reaction.

true
false

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.