Many of the items you purchase are mixtures of pure compounds. select three of these commercial products and prepare a list of the ingredients that are pure compounds.

Pure compounds are those compounds that have single molecule in their composition. Addition of even a one more molecule makes it impure.

Example of pure compound is water and impure compound is glycerine (contains mixture of hydrocarbons).

Three commercial products having pure compounds with its list of ingredients are:-

1. Gatorade - water (H2O), sugar, dextrose, citric acid (C6H8O7), salt (NaCl), monopotassium phosphate (KH2PO4) and sucrose acetate isobutyrate (C40H62O19).

2. Smart Water - calcium chloride (CaCl2), magnesium chloride (MgCl2), and potassium bicarbonate (KHCO3).

3. Nestle's Pure Life's list - calcium chloride (CaCl2), sodium bicarbonate (NaHCO3) and magnesium sulfate (MgSO4).

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.

c) should be the answer.