Please helppp Three groups do the same experiment rolling a car through two
photogates. The track is set at the same angle and all other
variables are kept the same for each group. The data is shown in
Figure 2.20. The first group does the experiment in the daylight.
The second group does it under a magnet. The third group does the
experiment in the dark. Group 2 claims that its experiment shows
that magnets make the car go faster. Is their claim supported by
the evidence? Explain why or why not.
Group 1: Time A to B... 0.343, 0346, 0.341, 0.340, 0.349.
Group 2: Time A to B... 0.339, 0.338, 0.345, 0.341, 0.339.
Group 3: Time A to B... 0.341, 0.337, 0.344, 0.340, 0.339.

first, consult an activity series chart to determine if al is more reactive than fe. it is, so it will replace the fe. now, one can continue with the problem.

next, make sure you have a correctly balanced equation.

3feo + 2al ==> 3fe + al2o3

now, determine which reactant (feo or al) is in limiting supply.

moles feo present = 125 g x 1 mole/71.8 g = 1.74 moles

moles al present = 25.0 g x 1 mole/26.98 g = 0.927 moles

since from the balanced equation, it take 3 mol feo for every 2 mol al, al will be limiting.

you can determine this simply by dividing moles of each by their coefficient in the balanced equation. for example: 1.74/3 = 0.58 and 0.927/2 = 0.464. al is less, so it is limiting.

finally, using the stoichiometry in the balanced eq. determine mass of fe that can be produced from 0.927 moles of al.

0.927 moles al x 3 moles fe/2 moles al x 55.8 g/mole = 77.6 g

the movement of aircraft through clouds can even cause lightning strikes. a single lightning event is a "flash", which is a complex, multi-stage explosively ejected.

explanation:

and the person below goggled it.

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