A1.1 Water
Water’s polarity and hydrogen bonding create solvent, thermal, cohesive and adhesive properties that support metabolism, transport, cooling and aquatic life.
- Syllabus
- First assessment 2025
- Topic
- A1.1
- Level
- HL
What you’ll learn
8 learning objectivesChoose one objective for a focused lesson, or study the complete topic.
Exam analysis
An aggregate view of how the complete A1.1 Water appears across past papers.
Chance of appearing18%of analysed past papers
Latest appearanceNovember 2025
Most common paperPaper2
Most tested objectives
- A1.1.2—Hydrogen bonds in water10 questions
- A1.1.3—Cohesion of water molecules5 questions
- A1.1.5—Solvent properties of water4 questions
Common question formats
- Definition or recall
- Diagram interpretation
- Process explanation
- Comparison
- Data analysis
- Structured response
Exam question appearances
November 2025Paper1A HL · TZ32[ 1 ]A1.1.7 (HL)—Extraplanetary origin of water on Earth
November 2025Paper1A HL · TZ11[ 1 ]A1.1.6—Physical properties of water for aquatic animals
May 2025Paper2 HL · TZ18(a)[ 4 ]A1.1.3—Cohesion of water molecules
May 2025Paper2 HL · TZ22(b)[ 2 ]A1.1.6—Physical properties of water for aquatic animals
May 2025Paper2 HL · TZ22(a)[ 2 ]A1.1.6—Physical properties of water for aquatic animals
Practice this topic
4 original exam-style questions based on the patterns above.
Coverage 2013–2025 · Updated 14 Jul 2026