Equation Reactant
4Fe(s) + 302(g) → 2Fe2O3(aq) + 1644.3 kJ
Product
States of Matter (All)
Coefficients (AII)
Subscripts
Yield
Exothermic or Endothermic

The chemical equation that is provided is :

4Fe(s) + 302(g) → 2Fe2O3(aq) + 1644.3 kJ

1. reactants :

In this equation, the reactants are iron or Fe and oxygen or O that react with one another to produce a new compound or product.

2. Products:

The single product is produced by the given equation after the reaction between Fe and O is Fe2O3 ferric or iron oxide.

3. states of matter (all)

Elements                      state

Fe                                 solid

O                                   gas

Fe2O3                         aqueous

4. Coieficents (all)

Elements                      state

Fe                                 4

O                                   3

Fe2O3                         2

5. subscripts:

Elements                      state

Fe                                  single

O                                   2

Fe2O3                         Fe = 2 and O = 3

6. yield :

The representation of yield is by the arrow between reactants and products that is: →

7. Exothermic or Endothermic:

The reaction generates the energy and gives it to the surrounding which confirms that the reaction is an exothermic reaction.

its going to be mutualism cuz they both benefit from the relationship.

~batmans wife dun dun

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.