Match the vocabulary word with its definition. match the items in the left column to the items in the right column.

1. mass per unit volume
inorganic
2. resistance of a material to being scratched
organic
3. compounds that contain carbon
density
4. compounds that do not contain carbon
hardness

Most of these can't be expanded. They are almost exact definitions.

1 Mass per unit volume                   Density

2 Resistance to being scratched    Hardness

3 Compounds containing Carbon   Organic

4 Compounds with no Carbon        Inorganic

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 mass of the cathode increases because ions from the solution get reduced to atoms and become part of the cathode.

explanation:

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