vocabulary
quantity of heat
transfer of thermal energy between two bodies that are at different temperatures
what is the question to find change in temperature
change T=Tf-Ti
25g of water
cooled from 23.9 to 12.7
how much heat was released
1170.4
joules to calories
4.184 j= 1 Calorie
is a negative DeltaH Endo or exo
exothermic
specific heat
amount of energy needed to raise the temperature of one gram of a substance by one degree Celsius
to find energy
q=mc(change in temp)
CH4+2O2-> CO2+2H20
Delta H=-802
-1910
joules to kj
1000J=1kj
Mg+1/2O2->MgO+601.7 Kj
Endo of exo and why?
exothermic - when they come together they released energy
heat
a form of energy that flows between two samples of matter because of their difference in temperature
heat of reaction
deltaHreaction= deltaHfproducts- Delta Hfreactants
3H2+N2->2NH3
how much energy is involved
-97kj
273.15 degrees C
is a combustion endothermic or exothermic
exothermic
system
part of the world you are studying
enthalpy using bond energies
deltaHrnx+bonds formed- bonds broken
2H2=O2->2H2O Delta H= -481.6
produced 92.1 kj
how many moles of water were produced
.383
ML to liters
1000ml+ 1 L
specific heat of water
4.18J/C
surroundings
everything else around the system
vaporization during boiling point
q=mdeltaH
energy needed to boil 91.2g CCl4
BP=350k. Delta Hfusion=2,67kj/mole, DeltaHvap=30kj, MM CCl4=153.83
17.8k
grams to kg
1000g= 1kg
difference between endothermic and exothermic
endo= heat goes from surroundings to system
exo= heat goes from system to surroundings