DUE FEB 4th HELP HELP HELP PLEASE HELP

1. is atmosphere

2. is air pressure

3. green house gases

4a. nitrogen

4b. oxygen

4c. carbon dioxide

5. stratosphere

6. troposphere

7. Air pressure is higher at lower altitudes. Air density is higher at lower altitudes. There is more space between air molecules at higher altitudes. There is less oxygen to breathe at the top of a high mountain than there is at sea level.

8. exosphere, this is because the air is thin, therefore making it cold

9. Without this barrier in place, all of the radiation would reach Earth, which is very damaging to plants and us.

10. Temperature increases as you gain altitude in the stratosphere and the thermosphere. Temperature decreases as you gain altitude in the troposphere and mesosphere.

11. When the level of greenhouse gases increase, the concentration of gases in the atmosphere would become greater. This event allows the gas molecules to increase in number, As a result, the air temperature increases.

note: 12 and 13 you are going to have to workout for yourself as I have no clue lol-

hope this helps :)

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