STOICHIOMETRY
When supposed you have the number of moles of a reactant or product in a reaction and you want to calculate for the mass of another product or reactant, what will you going to follow?
mole to mass
What is the phase change from liquid to solid called?
freezing
What is the van’t Hoff i-factor for Ba(OH)2 (s) dissolved in water?
2
What are the components of the internal energy of a system?
kinetic energy and potential energy
H2+ 1/2 O2 --> H2O + 285kJ
is an example of a:
thermochemical equation
What do you call that amount of solute that is being dissolved in certain amount of solution?
concentration of solution
What is the point at which all phases can exist in equilibrium?
triple point
true or false
Colligative properties arise from the fact that solute affects the concentration of solvent
true
It is the scientific study of the interconversion of heat and other kinds of energy
thermodynamics
if a chemical equation loses energy in order for the reaction to take place, then its a(n) ____ chemical energy process
exothermic process
It is defined as the number of moles of a solute in one liter of solution?
Molarity
The normal boiling point is the temperature at which its vapor is _________ atm
1
By adding antifreeze to the water in the radiator of a car, you:
Lower the freezing point of water in the radiator
Raise the boiling point of water in the radiator
true or false
During a chemical reaction, the energy of the system remains the same as bonds in reactant are broken and the atoms rearrange to form the new bonds of the products.
false
the amount of energy absorbed or lost by a system during a process at a constant pressure
enthalpy
It comes from the Greek words stoikheion, which means element and metron which means to measure.
stoichiomery
What is the point at which gas and liquid are indistinguishable from each other?
critical point
What unit is useful in relating the concentration of a solution with its vapor pressure?
mole fraction
Which of the following scenarios violates the first law of thermodynamics, “the conservation of energy?"
A. An isolated electrochemical cell that indefinitely generates an electrical current.
B. An efficient wind turbine that converts all of its energy from mechanical movement into electrical potential energy.
C. A machine that converts heat energy into work energy.
D. A spring that extends and retracts forever, alternating between potential and kinetic energy.
A. An isolated electrochemical cell that indefinitely generates an electrical current.
the amount of energy released as heat by the complete combustion of one mole of a substance
heat of combustion
2K(s) + 2H2O(l)→2KOH+(aq)
0.0400 mol of potassium being used up, how much hydrogen is being produced?
0.02M H2
A heating curve is a plot of which two chemistry concept?
time and temperature
Low concentration of oxygen in the blood and tissues of people living at high altitude is due to ____________.
low atmospheric pressure
When 100 kJ of work is done on a closed system during a process, the total energy of the system increases by 55.0 kJ.
Calculate how much heat is either added or removed from the system?
Q = -45 kJ
heat is removed from the system
a measure of the average kinetic energy of a substance
temperature