Equilibrium (Q vs. K and solubility)
According to Le Chatelier's Principle, describe the equilibrium shift with changes in pressure/volume, and the direction shifted respective to the moles of gas.
What is...
Increase Pressure/Decrease Volume: shift to side with LESS moles of gas
Decrease Pressure/Increase Volume: shift to side with MORE moles of gas
What is the pOH of a solution containing 0.0012 M OH- at 25°C?
What is...
2.92
Ecell = 1.83 V for the voltaic cell:
Br2(l) + Zn(s) → Zn2+(aq) + 2Br-(aq).
If EZn = -0.76 V, what is EBr?
What is...
1.07 V
What is the difference between a primary battery and a secondary battery?
What is...
primary batteries are non-rechargeable (alkaline, LeClanché) and secondary batteries rechargeable (lead-acid, Ni-Metal hydride, Lithium-ion).
What is the charge on cobalt in the following coordination complex?
Na[Co(NH3)2Cl4]
What is...
+3
State the assumption checks (400*Kc and 5% rule).
What is...
1. Smallest initial [] > 400*Kc
2. x / smallest initial [] ≤ 5%
(where x is the value found in the ice table)
100 mL of 0.40M NaOH added to 200 mL of 0.20 M HClO2.
What is...
no it will not! All of the HClO2 is neutralized by the OH-.
What is the reaction for this cell notation?
Tl(s) | Tl+(aq) || Sn2+(aq) | Sn(s)
What is...
2Tl(s) + Sn2+(aq) → 2Tl+(aq) + Sn(s)
What is the sign of the anode in an electrolytic cell?
What is...
positive!
What is the coordination number of the following complex?
[Co(en)3]2+?
What is...
CN = 6!
REMEMBER! The coordination number equals the number of BONDS, not the number of ligands!
2H2S(g) ⇌ 2H2(g) + S2(g) and Kc = 9.3 x 10-8 at 700°C.
If 0.45 moles of H2S is placed in a 3.0 L container, what is the equilibrium concentration of H2(g) at 700°C?
HINT! You might need an ice table!
What is...
0.0016 M H2(g).
A 0.15M solution of butanoic acid contains 1.51 x 10-3 M H3O+. What is the percent dissociation?
What is...
1.01%.
Aqueous solutions of 1.0 NiI2 and 1.0 KBr are mixed and electrolyzed. What are the products at pH = 7?
What is...
Ni at the cathode, I2 at the anode.
Which Group1A alkali metal reacts with O2 gas to form a peroxide (O22-)?
What is...
sodium! 2Na(s) + O2(g) --> Na2O2(s)
(Lithium reacts with O2(g) to form an oxide. K, Rb, and Cs react with O2(g) to form a superoxide).
What is the shape of the coordination complex [PdCl4]2-?
What is...
Square planar! (d8 metals are mostly found as square planar complexes).
REMEMBER: 1st row transition metals (3d metals) HALIDES are typically tetrahedral (so [MnCl4]2- would be tetrahedral).