a. formic acid (it has more polar components than cyclohexane, including an OH group, which can form hydrogen bonds with water; this is true of short chain carboxylic acids). Cyclohexane is completely nonpolar. b. Hydrogen iodide because it is an ionic compound, which will dissociate into H+ and I- in water. Furthermore, with the exception of silver/mercury/lead, all iodides are soluble in water. Iodine, or I2, is a solid that offers no means by which to achieve solubility. Its electronegativity difference is 0 (since iodine contains two identical atoms) whereas HI\'s electronegativity difference is much higher, which means it is a very polar molecule that can interact with polar water molecules. c. K2SO4 : all compounds that contain a group I metal (such as K, Na, Li) will be soluble in water because they are ionic and can therefore interact with polar water molecules. SiO2 (aka silica and quartz) is a nonpolar solid that will not interact with polar water molecules. Solution a. formic acid (it has more polar components than cyclohexane, including an OH group, which can form hydrogen bonds with water; this is true of short chain carboxylic acids). Cyclohexane is completely nonpolar. b. Hydrogen iodide because it is an ionic compound, which will dissociate into H+ and I- in water. Furthermore, with the exception of silver/mercury/lead, all iodides are soluble in water. Iodine, or I2, is a solid that offers no means by which to achieve solubility. Its electronegativity difference is 0 (since iodine contains two identical atoms) whereas HI\'s electronegativity difference is much higher, which means it is a very polar molecule that can interact with polar water molecules. c. K2SO4 : all compounds that contain a group I metal (such as K, Na, Li) will be soluble in water because they are ionic and can therefore interact with polar water molecules. SiO2 (aka silica and quartz) is a nonpolar solid that will not interact with polar water molecules..

1. a. formic acid (it has more polar components than cyclohexane, including an OH group, which
can form hydrogen bonds with water; this is true of short chain carboxylic acids). Cyclohexane is
completely nonpolar.
b. Hydrogen iodide because it is an ionic compound, which will dissociate into H+ and I- in
water. Furthermore, with the exception of silver/mercury/lead, all iodides are soluble in water.
Iodine, or I2, is a solid that offers no means by which to achieve solubility. Its electronegativity
difference is 0 (since iodine contains two identical atoms) whereas HI's electronegativity
difference is much higher, which means it is a very polar molecule that can interact with polar
water molecules.
c. K2SO4 : all compounds that contain a group I metal (such as K, Na, Li) will be soluble in
water because they are ionic and can therefore interact with polar water molecules. SiO2 (aka
silica and quartz) is a nonpolar solid that will not interact with polar water molecules.
Solution
a. formic acid (it has more polar components than cyclohexane, including an OH group, which
can form hydrogen bonds with water; this is true of short chain carboxylic acids). Cyclohexane is
completely nonpolar.
b. Hydrogen iodide because it is an ionic compound, which will dissociate into H+ and I- in
water. Furthermore, with the exception of silver/mercury/lead, all iodides are soluble in water.
Iodine, or I2, is a solid that offers no means by which to achieve solubility. Its electronegativity
difference is 0 (since iodine contains two identical atoms) whereas HI's electronegativity
difference is much higher, which means it is a very polar molecule that can interact with polar
water molecules.
c. K2SO4 : all compounds that contain a group I metal (such as K, Na, Li) will be soluble in
water because they are ionic and can therefore interact with polar water molecules. SiO2 (aka
silica and quartz) is a nonpolar solid that will not interact with polar water molecules.