A1.1 water

Question 1

What physical and chemical properties of water make it essential for life?

Answer 1

Polarity allows other polar molecules to dissolve in water, giving them solvent properties necessary for transporting dissolved molecules such as amino acids, sugars, salts, and waste in living organisms.

Question 2

A1.1.1—Water as the medium for life

Answer 2

first cells originated in water and that water remains the medium in
which most processes of life occur.

Question 3

A1.1.2—Hydrogen bonds as a consequence of the polar covalent bonds within water molecules

draw two or more water molecules with covalent and hydrogen bonds

Answer 3

polarity of covalent bonding within water molecules is due to the unequal sharing of electrons

hydrogen bonding due to this polarity occurs between water molecules.

Question 4

A1.1.3—Cohesion of water molecules due to hydrogen bonding and consequences for organisms