Which of the following should have the largest Henry's Law constant (KH) in water? CO2 SO2 CH3CH3 Xe

What force exists between H2O and  CH3CH2OH? Is it Ion-dipole?

Magnesium oxide (MgO) is an inorganic compound that occurs in nature as the mineral periclase. The atomic and ionic radii 2+ = of Mg and O are RMg = 0.16 nm; RMg 0.088 nm; Ro = 0.06 nm; Ro2 = 0.18 nm. Calculate the Coulombic force of attraction between Mg2+ and 02- in Mgo. Given: q = 1.6x10-19 C; Ko = 9x10° (V.m/C). Select one: a. Fc=-1.283x10-8 N b. Fc=1.904x10-8 N c. Fc=1.283x10-8 N d. Fc=-1.904x10-8 N

Consider the following chemical reaction between component A and B: A(?) + 2B(g) → C(g)+ 3D(l) …..ΔH°r = −2253.2 kJ i. State whether the reaction is exothermic or endothermic. ii. Based on the value of heat of reaction, explain the chemical reaction above in terms of the energy associated with breaking or formation of molecular bonds. iii. Consider a similar reaction of A and B as the one shown above. However, the reaction now generates D in vapor form instead of liquid. Explain how the heat of reaction value differs from the one shown above. iv. If the above reaction occurs in an isothermal system where there is no work interaction and both kinetic and potential energy changes are too small such that they are negligible, write the energy balance for the system.

Water’s highly polar character is responsible for its exceptional ability to dissolve a wide range of ionic and polar-covalent substances?

6. Ethanoic acid (CH3COOH) has a much lower vapor pressure than ethanol (CH3CH2OH). What is the most reasonable explanation? (A) The polarizability of two oxygen atoms increases the London forces of attraction in ethanoic acid compared with ethanol. (B) Hydrogen bonding in ethanoic acid is the strongest attractive force and is mainly responsible for the observed data. (C) Both ethanol and ethanoic acid have an – OH, so the difference is the dipole of the second oxygen that increases the attractive forces. (D) Ethanol has an - OH group and can hydrogen bond; therefore, the London forces must cause the effect.

35. Which of the following does have the highest  boiling point? molar masses:  C = 12.01 g/ mole,  S = 32.07 g/ mole,  O = 16.00 g/ mole,  H = 1.008 g/mole,  I = 126.9 g/mole, Cl = 35.45 g/mole  electronegativities:  C = 2.5,  H = 2.1,  O = 3.5, Cl = 3.0, S= 2.8 ,  I = 2.3 Group of answer choices a. I2 b. HCl c. SO2 d. CO

35. Which of the following does have the highest  boiling point? molar masses:  C = 12.01 g/ mole,  S = 32.07 g/ mole,  O = 16.00 g/ mole,  H = 1.008 g/mole,  I = 126.9 g/mole, Cl = 35.45 g/mole  electronegativities:  C = 2.5,  H = 2.1,  O = 3.5, Cl = 3.0, S= 2.8 ,  I = 2.3 a.COb.HClc.I2d.SO2

Explain each of these properties of water, and describe how each is conferred by the dipolar nature of a water molecule: high specific heat capacity; high heat of vaporization; unique density behavior; high surface tension; capacity to be a good solvent for ions of salts.