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100
  1. What is the limiting reactant and how many grams of NO are formed In the reaction:      NH3 + O2  NO + H2O  , 3.25 g of NH3 are allowed to react with 3.50 g of O2.
  1. Limiting reactant = O2, NO formed = 2.63g
100
  1. A chemical reaction has a reaction enthalpy of +430 kJ/mol.Is it endothermic or exothermic?
  1. Endothermic
100
  1. What are the properties of a gas?
  1. Indefinite shape and indefinite volume, takes the shape and volume of its container, has particles that are far apart, have low densities and are compressible, and gas mixtures are homogeneous.
100
  1. A gas with a volume of 4.0L at a pressure of 205kPa is allowed to expand to a volume of 12.0L. What is the pressure in the container if the temperature remains constant?
  1. 68.3kPa
100
  1. Rank the rate of reactions based on activation energy in increasing order

15k J/mol, 25k J/mol, 50k J/mol

  1. 15k J/mol, 25k J/mol, 50k J/mol
200
  1. What is the limiting reactant and how many grams of CO2 are formed If 4.95 g of ethylene (C2H4) are combusted with 3.25 g of oxygen.
  1. Limiting reactant = O2 CO2 formed = 2.98g
200
  1. A chemical reaction has a reaction enthalpy of −512 kJ/mol.Is it endothermic or exothermic?
  1. Exothermic
200
  1. What are the postulates of the Kinetic Molecular theory?
  1. Gas consists of tiny particles, either atoms or molecules, moving about randomly at high velocities. The volume of gas particles is negligible compared to the total volume of the gas. Most of the volume of the gas is empty space. The gas particles act independently of one another. Gas particles are constantly moving in straight paths, collisions of the gas particles, either with other particles or with the walls of the container,occur with the complete transfer of energy.  The average kinetic energy of the gas particles is proportional to the kelvin temperature of the sample.
200
  1. What pressure is required to compress 196.0 liters of air at 1.00 atmosphere into a cylinder whose volume is 26.0 liters?
  1. 7.54 atm
200
  1. Consider the following reaction and Write the equilibrium expression, Kc, the concentration 2 SO2 of is .15M, O2 is .3M, and 2 SO3 is .4M, Solve for Kc: 2 SO2 (g) + O2 → (g) 2 SO3 (g)
  1. Kc = [SO3]2/[SO2]2 [O2]    kc = 23.7
300
  1. Phosphorus reacts with bromine to form phosphorus tribromide. If 35.0 grams of bromine are reacted and 27.9 grams of phosphorus tribromide are formed, what is the percent yield?

            2 P + 3 Br2 →  2 PBr3

  1. 39.5 g PBr3 formed, percent yield = 70.63%
300
  1. How much heat is produced when NO and O react to form 50g CO2 in the following reaction?

            NO + O2 → CO2 + H2O   ΔH = -244kJ

  1. 277kJ
300
  1. What causes the pressure in a container?
  1. The collisions of the gas particles against the container wall
300
  1. A 40.0 L tank of ammonia has a pressure of 12.7 kPa. Calculate the volume of the ammonia if its pressure is changed to 8.4 kPa while its temperature remains constant.
  1. 60.5 L
300

Write the net ionic equation for this reaction KCl (aq) + Pb(NO3)2

2Cl- (aq) + Pb2+ (aq) -> PbCl2 (s)

400
  1. Silver Nitrate reacts with Magnesium Chloride to produce Silver Chloride and Magnesium Nitrate. If 305 grams of silver nitrate are reacted in an excess of magnesium chloride producing 23.7 grams of magnesium nitrate, what is the percent yield?
  1. 266g Mg(NO3)2 formed, Percent Yield = 8.91%
400
  1. How much heat is produced when H2 and O react to form 100g H2O in the following reaction:

H2 +O→ H2O         ΔH = -350kJ

  1. 1,943 kJ
400
  1. At sea level what is atmospheric pressure equal to?
  1. 1atm, 760mmhg, 760 torr
400
  1. Calculate the decrease in temperature when 6.00 L at 20.0 °C is compressed to 4.00 L
  1. 195.3 K
400
  1. Which of the following are strong electrolytes:
    1. NaCl
    2. CO
    3. HBr
    4. HCl
    5. HI
    6. HF
    7. HNO2
    8. CsOH
    9. Ca(OH)2
  1. NaCl,HBr,HCl,HI,CsOH, Ca(OH)2
500
  1. 50 g of nitrogen (N2) has a volume of ___ liters at STP.
  1. 40 L
500
  1. What are the four gas laws?
  1. Boyle, charles, gay-lussac, and avogadro
500
  1. A gas balloon has a volume of 106.0 liters when the temperature is 45.0 °C and the pressure is 740.0 mm of mercury. What will its volume be at 20.0 °C and 780 .0 mm of mercury pressure?
  1. 92.3 L
500
  1. For the combustion of sucrose:

C12H22O11 + 12O2 ---> 12CO2 + 11H2O

there are 10.0 g of sucrose and 10.0 g of oxygen reacting. Which is the limiting reagent?

Oxygen