Equilibrium
Bonds and Naming
Thermodynamics
Equations
Random Interpretation
100
When Q<K, which direction will equilibrium proceed?
The reaction will proceed to form products
100
What are the 7 strong acids?
HCl: Hydrochloric acid
HNO3: Nitric acid
H2SO4: Sulfuric acid
HBr: Hydrobromic acid
HI: Hydroiodic acid
HClO4: Perchloric acid
HClO3: Chloric acid
100
A student mixes two chemicals in a beaker. Frost appears on the outside of the beaker. Exothermic or endothermic, and does energy flow into or out of the system?
Endothermic, into the system
100
Write the equation for lithium reacting with silver nitrate.
Li + AgNO3 —> LiNO3 + Ag
100
Does this graph show a endothermic or exothermic process?
Endothermic
200
What does a small positive equilibrium constant say about the reaction at equilibrium?
Reactants are favored
200
When there is a breaking or formation of bonds, is a chemical or physical change occurring?
Chemical change
200
A penny is heated to 85°C and placed in a cup of water with a temperature of 27°C. Eventually both objects reach thermal equilibrium at 32°C. Is the average kinetic energy of the penny greater, less than, or equal to the average kinetic energy of the water?
Equal to
200
Balance __C3H8(g) + __O2(g) —> __CO2(g) + __H2O(l)
C3H8(g) + 5O2(g) —> 3CO2(g) + 4H2O(l)
200
What is the relationship between electronegativity and shielding electrons?
More shielding, weaker force of attraction, lower electronegativity
300
In which direction will the equilibrium shift when the temperature is decreased?
The reaction is endothermic, decreasing the temperature will shift the equilibrium to the left
300
Name Si2Br6.
Disilicon hexabromide
300
If ΔH° is positive and ΔS° is negative, will the reaction be thermodynamically favorable?
Not thermodynamically favored
300
What is the equation for the half life of a first order reaction?
t½ = 0.693/k
300
Explain how concentration affects the rate of reaction
The higher the concentration, the more collisions between molecules and a faster reaction
400
At what point does the reaction reach equilibrium and does the graph represent concentration change or reaction rate change and how do you know? (Red=reactants, blue=products)
B and the graph displays the rate of reaction because it is equal between products and reactants at equilibrium
400
What is the bond angle of a trigonal pyramidal shape? 120°, <90°, <109.5°
<109.5°
400
-3858 KJ/mol
400
A) Al (s) —> Al+3 (aq) + 3 e-
B) Ni+2 (aq) + 2 e- —> Ni (s)
Of the two half reactions, which represents oxidation?
A
400
Which acid is stronger and why?
HBrO or HBrO3?
HBrO3 because it has weaker bonds so there is less reliance on each to hold the acid together
500
What is the concentration of each substance in the equilibrium mixture at 1000°C? Suppose you start with 1.00 mol each of carbon monoxide and water in a 50.0 L.
CO(g) + H2O(g) ⇔ CO2(g) + H2 Kc= 0.58
[CO] = [H2O] = .0113 [CO2] = [H2] = .0087
500
N — O / C — O
Which bond is more covalent and why?
N — O because there is less of a difference in electronegativity
500
Calculate the amount of heat needed to purify 1.00 mole of Al originally at 298 K by melting it. The melting point of Al is 933 K. The molar heat capacity of Al is 24 J/(mol⋅K), and the heat of fusion of Al is 10.7 kJ/mol. (Use q=nc∆t and q=n∆H°fus)
26 KJ
500
Write the net ionic equation for the reaction that takes place when an aqueous solution of lead nitrate, Pb(NO3)2, and sodium iodide, NaI, are mixed. (There will be a precipitate.)
Pb+2(aq) + 2I-(aq) > PbI2(s)
500
CH3NH2