Thermo
Enthalpy Stoichometry
Hess's Law
Heat of Formation
Random!
100
What is the first law of thermodynamics?
Energy cannot be created or destroyed.
100
What is the SI Unit for energy?
Joules
100
What is the main idea about Hess's Law?
Adding all the Enthalpies together.
100
What is the heat of formation equation?
Hrxn= EHf (products)- EHf(reactants)
100
What is the capital of China?
Beijing
200
What is the Enthalpy equation?
Hproducts-Hreactants
200
Balance the following equation:
C2H6 + O2 ------> CO2 + H2O
2 7 4 6
200
When do I flip a sign?
If the reactant is on the product side of a below equation.
200
Where do the coefficients come into play?
They are used to multiply by the heat of formation
200
What letter does not appear on the Periodic Table?
J
300
If I have a negative H value am I exothermic or endothermic?
Exothermic
300
CH₄ + 2O₂ → CO₂ + 2H₂O ΔH = –890 kJ/mol
How much heat is released when 16.0 g of CH₄ is burned?
-890 KJ
300
2C(s) + H2(g) ---> C2H2(g)ΔH° = ??? kJ
C2H2(g) + 5⁄2O2(g) ---> 2CO2(g) + H2O(ℓ)
ΔH° = −1299.5 kJ
C(s) + O2(g) ---> CO2(g) ΔH° = −393.5 kJ
H2(g) + 1⁄2O2(g) ---> H2O(ℓ) ΔH° = −285.8 kJ
Tell me if any Signs need to be flipped?
Yes. The first one.
300
Calculate ΔH for the following reaction:
8 Al(s) + 3 Fe3O4(s) → 4 Al2O3(s) + 9
Aluminium= -1669.8 KJ
Aluminium Oxide= -1120.9 KJ
-3316.5 KJ
300
What profession was most of the disciples?
Fisherman
400
Is this endothermic or exothermic?
Endothermic
400
CH₄ + 2O₂ → CO₂ + 2H₂O ΔH = –890 kJ/mol
How much heat is released when 32.0 g of O₂ reacts with excess methane?
-890 KJ
400
Is this endothermic or exothermic?
2C(s) + H2(g) ---> C2H2(g)ΔH° = ??? kJ
C2H2(g) + 5⁄2O2(g) ---> 2CO2(g) + H2O(ℓ)
ΔH° = −1299.5 kJ
C(s) + O2(g) ---> CO2(g) ΔH° = −393.5 kJ
H2(g) + 1⁄2O2(g) ---> H2O(ℓ) ΔH° = −285.8 kJ
Endothermic
400
Calculate ΔH for the ionization of hydrogen bromide:
HBr(g) → H+(aq) + Br-(aq)
Bromine= -120.9 KJ
Hydrobromic Acid= -36.2 KJ
-84.7 KJ
400
Where was the first capital of the United States?
Philadelphia
500
What does (a) Represent?
a= activation energy
500
2NO + O₂ → 2NO₂ ΔH = –112 kJ/mol
If 30.0 g of NO reacts with 45.0 g of O2, how much heat is produced?
NO= -111.96 KJ
O2= -157.5 KJ
500
Calculate H for the reaction
2C(s) + H2(g) ---> C2H2(g)ΔH° = ??? kJ
C2H2(g) + 5⁄2O2(g) ---> 2CO2(g) + H2O(ℓ)
ΔH° = −1299.5 kJ
C(s) + O2(g) ---> CO2(g) ΔH° = −393.5 kJ
H2(g) + 1⁄2O2(g) ---> H2O(ℓ) ΔH° = −285.8 kJ
226.8 KJ/Mol
500
What is the specific heat of water?
4.184 KJ/Mol
500
What is my favorite food?
Crab Legs