The following reaction shows the products when sulfuric acid and aluminum hydroxide react. 2Al(OH)3 + 3H2SO4 → Al2(SO4)3 + 6H2O The table shows the calculated amounts of reactants and products when the reaction was conducted in a laboratory. Initial Mass and Yield Sulfuric Acid Aluminum Hydroxide Initial Amount of Reactant 40 g 45 g Theoretical Yield of Water from Reactant 14.69 g 31.15 g What is the approximate amount of the leftover reactant? (4 points)
20.89 g of sulfuric acid
22.44 g of sulfuric acid
21.22 g of aluminum hydroxide
23.78 g of aluminum hydroxide

? you expect us to answer this? ? this is your schoolwork, i don't think we can with this, i think it would considering being

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.

you gotta add the following molecules so we can give u an answer

explanation: