Enthalpies
Bond breaking is a __________ process
Endothermic (+)
Salts that produce electricity when dissolved
Electrolyte
A measure of an atom's ability to pull electrons
Electronegativity
How tall am I
5'9
The physical/natural state of an element in which they are observed under normal conditions
Given a salt solution, moles of the substance divided by the volume (in liters) of the solution
Molarity (M)
What is the intermolecular force water can exhibit?
Hydrogen bonding
When is Lou's office hours?
Tuesdays & Wednesdays from 2 - 3:30 PM in the mole hole
What is the enthalpy of formation (ΔHf) of graphite, C(s)?
0
The concentration of products over concentration of reactants
K (equilibrium constant)
When two covalently bonded atoms have a high electronegativity difference, it is _____
Polar
A combustion reaction always indicates that ______ is involved
Oxygen!
CO2 and H2O are also products most of the time
What is ΔH for the reaction:
2NO(g) + O2(g) --> 2NO2(g)
Given
ΔHf NO2 = +33.2 kJ
ΔHf NO = +91.3 kJ
-116.2 kJ
What is the molar solubility of Pb(OH)2? Ksp = 5.36 ⋅ 10-13
Pb(OH)2 (s) ⇌ Pb2+(aq) + 2OH-(aq)
5.12 ⋅ 10-5 M
Why can't oil and water mix?
Water is polar and oil is nonpolar
NH3 (g) + 3F2 (g) --> NF3 (g) + 3HF (g) ΔHo rxn = -881.2 kJ
What is the standard enthalpy of formation for NF3?
ΔHof NH3 (g) = -45.9 kJ/mol
ΔHof HF(g) = -273.3 kJ/mol
-107.2 kJ
What is ΔH for the reaction:
4NO(g) + 6H2O(l) --> 4NH3(g) + 5O2(g)
Given
2N2(g) + 2O2(g) --> 4NO(g) ΔH = -361.0 kJ
N2(g) + 3H2 (g) --> 2NH3(g) ΔH = -91.8 kJ
2H2 (g) + O2 (g) --> 2H2O(g) ΔH = -483.6 kJ
+1628.2 kJ
What is the boiling point of a solution made with 0.24 kg of magnesium phosphate, Mg3(PO4)2 dissolved in 0.90 kilograms of water? (Kb for water is 0.510o C/m)
102.6o C
How many hydrogen bonds can ethanol, C2H5OH form?
1
In the reaction below, the rate of formation of O2 was observed to be 4.0 ⋅ 10-2 M/s. Determine the rate of production of NO2 (g).
2N2O5 (g) --> 4NO2 (g) + O2 (g)
0.16 M/s