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Problem 109a
A series of anions is shown below:
The anion on the far right is called 'BARF' by chemists, as its common abbreviation sounds similar to this word. (a) What is the central atom and the number of electronpair domains around the central atom in each of these anions?
Problem 109b
A series of anions is shown below:
The anion on the far right is called 'BARF' by chemists, as its common abbreviation sounds similar to this word. (b) What is the electron-domain geometry around the central B in BARF?
Problem 109c
A series of anions is shown below: The anion on the far right is called 'BARF' by chemists, as its common abbreviation sounds similar to this word. (c) Which, if any, of these anions has an expanded octet around its central atom?
- The following table presents the solubilities of several gases in water at 25 °C under a total pressure of gas and water vapor of 1 atm. (b) The solubilities (in water) of the hydrocarbons are as follows: methane 6, ethane 6, and ethylene. Is this because ethylene is the most polar molecule? Gas Solubility (mM) CH4 (methane) 1.3 C2H6 (ethane) 1.8 C2H4 (ethylene) 4.7 N2 0.6 O2 1.2 NO 1.9 H2S 99 SO2 1476 (c) What intermolecular interactions can these hydrocarbons have with water? Gas Solubility (mM) CH4 (methane) 1.3 C2H6 (ethane) 1.8 C2H4 (ethylene) 4.7 N2 0.6 O2 1.2 NO 1.9 H2S 99 SO2 1476 (e) Explain why NO is more soluble in water than either N2 or O2. Gas Solubility (mM) CH4 (methane) 1.3 C2H6 (ethane) 1.8 C2H4 (ethylene) 4.7 N2 0.6 O2 1.2 NO 1.9 H2S 99 SO2 1476 (f) H2S is more water-soluble than almost all the other gases in the table. What intermolecular forces is H2S likely to have with water? Gas Solubility (mM) CH4 (methane) 1.3 C2H6 (ethane) 1.8 C2H4 (ethylene) 4.7 N2 0.6 O2 1.2 NO 1.9 H2S 99 SO2 1476 (g) SO2 is by far the most water-soluble gas in the table. What intermolecular forces is SO2 likely to have with water? Gas Solubility (mM) CH4 (methane) 1.3 C2H6 (ethane) 1.8 C2H4 (ethylene) 4.7 N2 0.6 O2 1.2 NO 1.9 H2S 99 SO2 1476
Problem 111
- A small cube of lithium 1density = 0.535 g/cm32 measuring 1.0 mm on each edge is added to 0.500 L of water. The following reaction occurs: 2 Li1s2 + 2 H2O1l2 ¡ 2 LiOH1aq2 + H21g2 What is the freezing point of the resulting solution, assuming that the reaction goes to completion?
Problem 112
Problem 114a
Compounds like sodium stearate, called 'surfactants' in general, can form structures known as micelles in water, once the solution concentration reaches the value known as the critical micelle concentration (cmc). Micelles contain dozens to hundreds of molecules. The cmc depends on the substance, the solvent, and the temperature. (a) The turbidity (the amount of light scattering) of solutions increases dramatically at the cmc. Suggest an explanation. .
- What is the boiling point of a 0.10 M solution of NaHSO4 if the solution has a density of 1.002 g>mL?
Problem 122