Calculate the percent composition of oxygen in the molecule C12H22O11
51.42%
100
How many moles is 2.8 g of CuNO3 equal to?
0.0223 mol CuNO3
100
Determine whether a precipitate is formed in the folowing reaction. If a precipitate is formed indicate which it is:
MgSO4 (aq) + Ca(NO3)2 (aq) ---> Mg(NO3)2 (?) + CaSO4 (?)
Calcium sulfide is the precipitate
100
What are the standard temperature and pressure for measuring thermodynamic variables?
standard temperature = 25 degrees celsius
standard pressure = 1 atm
100
What do you call an insoluble salt that "falls out of solution"?
Precipitate
200
Balance the following equation:
__ FeCl3 + __ NaOH ----> __ Fe (OH)3 + __ NaCl
If the density of an object is found to be 15.2 g/ml and have a volume 4.6 mL, what is the objects mass?
69.92 g
200
Predict the products of the following reaction:
Al2O3 + 3BaCl2 ---> ________ + _________
Al2O3 + 3BaCl2 ---> 2AlCl3+ 3BaO
200
Write the correctly balanced equation for the dissociation of calcium chloride into its ions.
CaCl2 --> Ca^(+2) + 2 Cl^(-1)
200
What do you call a substance that conducts electricity when dissolved in solution?
Electrolyte
300
Name the following compounds:
N2O5, Fe2O3, SO2
dinitrogen pentoxide, iron (III) oxide, sulfur dioxide
300
Convert 86 inches into meters.
(1 inch= 2.54 cm)
2.18 m
300
Calculate the Heat of reaction for :
CS2 (l) + 3O2 (g) --> CO2 (g) + 2SO2 (g)
C (s) + O2 (g) --> CO2 (g) H= -393.5 kJ/mol
S (s) + O2 (g) --> SO2 (g) H= -296.8 kJ/mol
C (s) + 2S (s) --> CS2 (l) H= +87.9 kJ/mol
H= -1075 kJ
300
Calculate the molarity of a solution containing 4.75 g of Ca(NO3)2 dissolved into 200 mL of water.
0.15 M
300
Determine the value for heat flow associated with 8.00 g of water allowed to cool from 120 degrees celsius to a final temperature of 80 degrees celsius.
specific heat of water = 4.184
q= -1338.88 J
400
What is the formula of the following:
cobalt (II) nitrate, trinitrogen heptoxide
Co(NO3)2, N3O7
400
An unknown compound is found to be composed of the following, 40% Carbon, 6.75% Hydrogen, and 53.3% Oxygen. Determine the empirical formula for this compound.
(Hint: Assume 100 g)
CH2O
400
Calculate the enthalpy of the reaction.
Fe2O3 (s) + 6HCl (g) ---> 2FeCl3 (s) + 3H2O (g)
Fe2O3 --> H= -822.16 kJ
HCl --> H= -92.3 kJ
FeCl3 --> H= -400 kJ
H2O --> H= -136.1 kJ
H= 167.66 kJ
400
What is it called when a reaction depends only on the present state of the system, not the path taken?
State Function
400
A 10 g bar at 80 degrees celsius is placed into 70 g of water at 25 degrees celsius. What is the final temperature of water after being alowed to reach equilibrium?
25.85 degrees Celcius
500
Calculate the molecular weight of CO3(PO4)2 to five significant figures.
366.75 g
500
Determine the amount of AlCl3 is made when 2.55 g of Cl2 and 1 g of Al is used.
Al +Cl2 ---> AlCl3
3.2 g of AlCl3
500
Calculate E for a system that performs 800 kJ of work on the surroundings while 500 kJ of heat is transferred from the surroundings to the system.
E = -300 kJ
500
How many mL of 10M NaOH are required to make 1L of 5M NaOH?
500 mL
500
Write the molecular and net ionic equations (if any) for the neutralization reaction:
HBr + KOH ----> ____ + ______