Acar battery produces electrical energy with the following chemical reaction. pb + pbo2 + 2h2so4 es001-1.jpg; 2pbso4 + 2h2o what is the mole ratio of pbo2 to water?

The  mole  ratio of PbO2 to   water  in

Pb + PbO2 +2 H2SO4  = 2PbSO4 + 2H2O  is

            1 :2

1  mole of Pb reacted  with 1  mole  of PbO2    and 2  moles of H2SO4 to form 2 moles of PbSO4 and 2  moles of  H2O

therefore  the mole ratio  of Pbo2 to H2O is  1:2

Taking into account the reaction stoichiometry, the mole ratio of PbO₂ to water PbO₂:H₂O is 1:2.

The balanced reaction is:

Pb + PbO₂ + 2 H₂SO₄ → 2 PbSO₄ + 2 H₂O

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

Pb: 1 mole PbO₂: 1 mole H₂SO₄: 2moles PbSO₄: 2 moles  H₂O: 2 moles

Then, you can observe that by stoichiometry of the reaction 1 mole of PbO₂ forms 2 moles of water (H₂O).

Finally, the mole ratio of PbO₂ to water PbO₂:H₂O is 1:2.

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the answer is true.

this statement is true.

Answer: abeexplanation:

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.