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Transition Metals
Colligative Calculations
Coordination Chem
Everyday Colligative Properties
100
Write the electron configuration of the transition metal in the following complex ion: PtCl42- What geometry would you expect this ion to have?
[Xe]5d^8 Square Planar
100
What is the boiling point elevation when 11.4 g of ammonia (NH3) is dissolved in 200. g of water? Kb for water is 0.52 °C/m.
dT = 1.74 °C
100
Give the coordination number and oxidation state of the metal for the following complex ion: [Co(H2O)(OH)2Br]^-1
CN = 4; Oxidation State = 2+
100
Why would adding salt to water make your pasta cook faster?
Adding salt increases the boiling point of the water, so your pasta will be cooking at a higher temperature than if it was in pure water. **It does not make the water boil faster!!
200
Write the electronic configuration for each of the following transition metal atoms and ions. Use [Ar] to represent the argon core configuration: 1s2, 2s2, 2p6, 3s2, 3p6. Mn2+
Mn2+ = [Ar]3d5
200
0.64 g of adrenaline in 36.0 g of CCl4 produces a bp elevation of 0.49 °C. What is adrenaline's molecular weight? (For adrenaline, i=1)
180 g/mol
200
Give the coordination number and oxidation state of the metal for the following complex ion: [Ag(NH3)2]+1
CN = 2; Oxidation State =+1
200
Propose an explanation for why the salt in tears works against microbes to keep our eyes sterile.
They kill microbes by osmotic dehydration.
300
Write the electronic configuration for each of the following transition metal atoms and ions. Use [Ar] to represent the argon core configuration: 1s2, 2s2, 2p6, 3s2, 3p6. Co
Co = [Ar]3d74s2
300
Calculate the vapor pressure lowering (∆P) when 175g of sucrose (C12H22O11) is dissolved into 350.00 ml of water at 75 deg C. The vapor pressure of pure water at 75 deg C is 289.1 mm Hg, and it’s density is 0.97489 g/ml.
7.600 mm Hg
300
Draw two linkage isomers of [Mn(NH3)5(NO2)]+2
[Mn(NH3)5(NO2)]+2 and [Mn(NH3)5(ONO)]+2
300
Based solely on colligative properties, which salt would you choose to use on the roads in winter if you were the director of transportation for the town of Wellesley? LiCl or CaCl2
CaCl2 because it has a larger Van't Hoff factor (3) than LiCl (2), and therefore would decrease the freezing point of ice to a lower temperature than LiCl.