Gas solubility and Henry's law become meaningful through real-world science in this Grade 11 learning stations activity. Students investigate how pressure affects dissolved gases by examining documented examples involving carbonation, diving, volcanic lakes, groundwater, and aquatic oxygen. Rather than memorizing a relationship between pressure and concentration, learners apply chemical equilibrium concepts to environmental, technological, and safety situations.

Under Pressure: Real-World Gas Solubility Stations is designed for a rotating classroom investigation in which small groups examine case-study cards, record scientific observations and explanations, and compare evidence during a concluding discussion. The resource supports the study of Solutions and Solubility in Alberta Grade 11 Science.

What Makes These Cases Worth Investigating?

Pressure changes can have very different consequences depending on where dissolved gases are found. Carbonation provides a familiar starting point, while diving and volcanic lakes introduce important safety considerations. Groundwater and aquatic oxygen examples extend the investigation into environmental chemistry.

Across these contexts, students examine the relationship described by Henry's law: at constant temperature, the equilibrium concentration of a dissolved gas is proportional to its partial pressure above the solution. They distinguish changes in gas-liquid equilibrium from the actual release of dissolved gas and consider how scientific evidence helps explain observed outcomes.

What's Included

• Real-world station cards: Case studies covering pressure-related gas solubility phenomena in different settings.
• Student station recording sheet: A structured place to document information and scientific reasoning as groups rotate.
• Station wrap-up: A concluding activity for comparing cases and connecting the chemistry concepts.
• Teacher Guide in the Answer Key PDF: Learning Objectives, Teaching Tips, Discussion Questions, and Common Mistakes to support instruction.

Scientific Thinking Students Practise

• Explain how gas partial pressure influences dissolved gas concentration.
• Apply Henry's law to familiar and less familiar situations.
• Analyze evidence from carbonation, diving, volcanic lakes, groundwater, and aquatic oxygen cases.
• Compare environmental, technological, and safety consequences of pressure changes.
• Evaluate how scientific evidence informs decisions about gas solubility phenomena.

Using the Stations in Your Classroom

Place the case-study cards at separate locations around the classroom. Assign students to small groups and have each group begin at a different station. Students read the case, discuss the evidence, and complete their individual recording sheets before rotating to the next location.

After the rotations, use the station wrap-up to bring the class together. Encourage students to identify similarities and differences between the cases, explain how pressure affects equilibrium, and consider why changes in dissolved gas concentration matter in practical situations.

Why This Resource Supports Deeper Chemistry Learning

Gas solubility can be difficult to interpret when taught only through equations. These case studies connect the proportional relationship in Henry's law to observable phenomena and meaningful consequences. Students must move beyond recalling a definition to explaining evidence, comparing contexts, and communicating conclusions.

The accompanying Teacher Guide provides discussion prompts and identifies common mistakes, making it easier to address confusion between equilibrium concentration and gas release.

Bring pressure effects, dissolved gases, and chemical equilibrium together in a Grade 11 science investigation grounded in real-world examples.