May 2024
Oceans are responsible for absorbing how much CO2 from the atmosphere?
33.3% (1/3)
Can you drive from Massfield to Atomville without driving through Moletown?
No, you can't
Contrast the Limiting Reactant and the Excess Reactant.
Limiting Reactant restricts the amount of products
Excess Reactant doesn't restrict the amount of products
Calculate the Molar Mass for PdNO3
Molar Mass=168.43 g/mol
How many SigFigs are in 3,045.07
5 SigFigs
Why will the Forward Reaction slow as more reactants are converted to products?
There are less collisions
During Chemical Equilibrium, what is the same?
The rate
What happens when the Limiting Reactant is all used up?
No more products are produced and the reaction stops
Why are LDF's temporary?
Uneven Electron Distribution
How do particles move in a solid, liquid, and gas?
Gas: Bounce around
Liquid: Slowly moves around
Solid: Vibrate in place
Where does Milk of Magnesia fall on the pH Scale?
pH=10 (Base)
Why is rain water slightly acidic?
Because there is Carbon Dioxide in the air
Describe the Molarity Traingle
Moles on top
Molarity on bottom left
Liters on bottom right
Write the BCE for the UBCE.
UBCE: CH2(g) + O2(g) = CO2(g) + H2O(g)
2CH2(g) + 3O2(g) = 2CO2(g) + 2H2O(g)
When calculating pressure conversions, when can you cancel things out?
When you have units on the top and bottom of the fractions
Calculate [H+1] in an aqueous solution with a pH=3.78
[H+1]=1.6 x 10^-4
If the Keq is >1, what will the reaction look like?
[Products]>[Reactants]
Balance and Write the Mole Ratio for the UBCE, MgCl2(aq) + Al(s) = Mg(s) + AlCl3(aq)
3 mol MgCl2: 2 mol Al: 1 mol Mg: 2AlCl3
Contrast IaMF and IMF
IMF is outside the molecule
Pressure is 462.9 torr. Convert to atm.
(462.9 torr/1)(1 atm/760 torr) = 462.9/760 = 0.609 atm
Calculate pH of a 2.1 x 10^-4M H aqueous solution at 25 C. State whether the solution is Acidic, Basic, or Neutral.
pH=-log(2.1x10^-4)
pH=3.67 (Acidic Solution)
Calculate the volume of solution in mL prepared from from a 5.483 M Cu(NO3)2 solution made by dissolving 8.69 g Cu(NO3)2 in water.
MM (Cu(NO3)2)=187.57 g/mol
(8.69 g Cu(NO3)2/1) (1 mol Cu(NO3)2/187.57 g Cu(NO3)2) = 0.04632937 mol Cu(NO3)2
0.043633/5.483=0.00845 L
Volume = 8.45 mL
Calculate the molarity of a solution prepared by dissolving 5.247 g AgNO3 in enough water to make 20.5 L of solution.
MM = 169.88
(5.247 g AgNO3/1)(1 mol AgNO3/169.88 g AgNO3) = 5.247/169.88 = 0.030886508
Molarity = 0.0308 mol AgNO3
Write the BCE based on this description.
Gaseous Tricarbon Octahydride mixes with with Oxygen gas to form water vapor and gaseous Carbon Dioxide,
C3H8(g) + 5O2(g) = 4H2O(g) + 3CO2(g)
A balloon is filled with 40.76 L or air at a pressure of 428.83 torr. Calculate the pressure of the balloon if the volume is changed to 25.65 L.
(428.83 torr)(39.52 L)/25.65 L
428.83 x 39.52 = 15660.87/25.65 = 610.56
Pressure = 610.6 torr