Misc
What are the values of STP?
If a tire has a pressure of 3.0 bars and a volume of 5.0L and the pressure increases to 4.5 bars, what would the new volume be?
3.33 L
If I react Beryllium and 5.0 moles of Sulfur, how many moles of Beryllium Sulfide will I produce?
2Be + S₂ → 2BeS
10 moles
If a reaction has a negative enthalpy value, how is the energy being transferred?
From the system to the surroundings
The energy of an aluminum bar is 300J when the temperature changes from 30 degrees C to 60 degrees C. How many grams of aluminum would be present? The specific heat capacity of aluminium is 0.89.
11.2g
When doing Gas Laws, temperature must always be in _______.
How do you convert it?
Celcius + 273
If the pressure of a tank is 1.0atm and has a temperature of 400K, what would the new pressure be if the temperature increased to 570K?
1.21 atm
If I react 2.4 moles of Magnesium with oxygen, how many moles of oxygen would be needed for this reaction to proceed?
____ Mg + ___ O₂ → ____ MgO
1.2 moles
Write the following equation with the energy term (one way, you pick)
2H2 + O2 --> 2H2O releases 20.5 kJ of energy
2H2 + O2 --> 2H2O + 20.5 kJ
2H2 + O2 --> 2H2O deltaH = -20.5 kJ
12.0 g of ice is heated from 0 degrees C to 15 degrees C. How much energy would be required for this process to occur? The specific heat capacity of ice is 2.1.
378 J
Convert 700 torr into atm
700/760 = 0.92 atm
A 0.4 gallon balloon has a 3.0 moles of Helium. If the amount of Helium increased to 5.4 moles, what would the new volume be?
0.72 gallons
If I react 20.0g of sodium with oxygen , I can produce sodium oxide. How many grams of sodium oxide would be produced from this reaction?
4Na + O₂ → 2Na₂O
about 27 g Na2O
If a reaction is endothermic, is enthalpy positive or negative? How is the energy being transferred?
Enthalpy is positive.
Energy is being transferred from the surroundings to the system
How much energy would result from melting 50 grams of ice into water?
16700 J
Balance the following equation:
Al + Cl2 --> AlCl3
2Al + 3Cl2 --> 2AlCl3
If 5.5 moles of an ideal gas has a pressure of 3.9 atm, a volume of 40L, what would the temperature be?
345.5 K
If I react 100.0g of Calcium with oxygen , I can produce calcium oxide. How many grams of oxygen would be needed for this reaction to proceed?
2Ca + O₂ → 2CaO
about 40 g O2
How many kJ of energy will be released when sodium reacts with 10.0 g of fluorine to produce sodium fluoride?
2Na + F₂ → 2NaF ΔH = -204.0 kJ
about 53.7 kJ
How much energy would be required to vaporize 35g of liquid water?
79100 J
Summarize Le Chatlier's Principle in your own words
if equilibrium is disturbed by something (like temperature change, concentration, etc) the equilibrium will shift to counterract that and reestablish equilibrium
4.0 moles of gas occupies a volume of 2.0L at STP. If the volume increases to 3.4L, the temperature increases to 100 degrees C, and the pressure increases to 2.6 atm, what would the new amount of gas be?
12.94 moles
If I react 30.0g of Zinc with sulfur , I can produce zinc sulfide. How many grams of zinc sulfide would be produced from this reaction?
____ Zn + ____ S₂ → ____ ZnS
about 44.7 g ZnS
How many kJ of energy will be released when 40 g of sodium reacts with fluorine to produce sodium bromide?
2Na + Br₂ → 2NaBr ΔH = 333.0 kJ
about 289.6 kJ
20.0 g of liquid water is heated from 5 degrees C to 70 degrees C. How much energy would be required for this process to occur?
5434 J