Which of these is a balanced chemical equation

C

Explanation:

Balanced equations have the same number of atoms of each element on both sides of the equation (right and left side of the arrow).

First count the number of atoms of each element of the original equation.

CO(g) + O₂(g) ⟶ CO₂(g)

RHS: 1C, 3O

LHS: 1C, 2O

Balancing the O atoms,

2CO(g) + O₂(g) ⟶ 2CO₂(g)

LHS: 2C, 4O

RHS: 2C, 4O

Thus, the equation is balanced.

*General rule: balance O and H atoms last (in this case C atoms were initially balanced)

LHS= left- hand side

RHS= right- hand side

A) Incorrect as there are 3 O atoms on the LHS and only 2 O atoms on the RHS.

B) Incorrect as there is 1 C atom on the LHS and 2 C atoms on the RHS. Also, on the LHS there is 3 O atoms while there is 4 O atoms on the RHS.

D) Incorrect.

LHS: 2C, 6O

RHS: 2C, 4O

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.