Match each letter with the definition 1. atomic mass a. tells the number of protons in the nucleus of an element 2. atomic number b. states that matter is neither created nor destroyed 3. electron c. elements that generally have a shiny or metallic luster 4. element d. anything that has mass and takes up space 5. law of conservation of matter e. positively charged central part of the atom 6. matter f. negatively charged subatomic particle 7. metal g. matter made up of only one kind of atom 8. neutron h. weighted average mass of an element 9. nucleus i. uncharged particle in the nucleus of an atom 10. proton j. positively charged subatomic particle

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

geosphere and hydrosphere.

this is because the geosphere has to do with geological events, while the hydrosphere controls all water on earth.