What is the thermochemical equation for the combustion of methane. methane formula: ch4 (g) and the deltah comb -891 (kj/mol)

Answer : A thermochemical equation gives a balanced stoichiometric chemical equation which mainly includes the enthalpy change during the reaction process, ΔH.

Combustion reactions are those reactions which occurs when a hydrocarbon molecule reacts with oxygen to give products as carbon dioxide and water. In other words, combustion reaction involves a reaction between any combustible material and an oxidizer to form an oxidized product.

For combustion of methane, methane reacts with the oxygen and forms carbon dioxide and water as the products.

The thermochemical equation will be as

→ . and ΔH = -891 KJ/mol

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.