IB Biology HL A1.1.2 Hydrogen Bonds in Water Questions
Practise explaining how water’s V-shape creates polarity, how molecules hydrogen-bond to one another, and how those attractions support water’s thermal role in cells.
Syllabus
First assessment 2025
Course
Biology HL
Level
HL
Exam points
Show partial charges and distinguish hydrogen bonds between water molecules from covalent O–H bonds.
Relate hydrogen bonding to water’s thermal properties, liquid range and evaporative cooling in biological contexts.
IB Biology HL A1.1.2 Hydrogen Bonds in Water Questions question 1
[Maximum number: 2]
The figure represents a water molecule.
Draw a second water molecule to show how bonds can form between water molecules, including the name of the bond.
a. similar water molecule drawn with oxygen on one molecule facing hydrogen on the other water molecule; b. one hydrogen bond drawn as a dotted/dashed line between the two water molecules and labelled;
O and H do not need to be labelled but must be positioned correctly