CHEM 205 Jeopardy!!

Transition Metals

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

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

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

Colligative Calculations

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

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

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

Coordination Chem

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+

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

300

Draw two linkage isomers of [Mn(NH3)5(NO2)]+2

[Mn(NH3)5(NO2)]+2 and [Mn(NH3)5(ONO)]+2

Everyday Colligative Properties

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

Propose an explanation for why the salt in tears works against microbes to keep our eyes sterile.

They kill microbes by osmotic dehydration.

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.