MoyoEd Research

Dr Caleb Moyo.

A-level chemistry is intellectually demanding, presenting learners with abstract constructs, such as equilibrium, enthalpy, kinetics, redox reactions, and organic mechanisms. When taught in isolation, these concepts feel detached from students’ lived experiences, leading to reduced motivation and limited conceptual retention. Over the past two decades, empirical research has increasingly demonstrated that contextualisation, the intentional integration of real-world, socio-scientific, industrial, or local examples into chemistry instruction, is a powerful pedagogical tool for making these abstractions meaningful and cognitively accessible (Bennett et al., 2007; Gilbert, 2006; Broman & Parchmann, 2014).

Contextualisation has been defined in multiple ways across the literature, but most researchers agree that it involves more than simply adding a story or eye-catching example at the start of a lesson. Instead, it is the deliberate framing of core chemistry ideas within authentic scenarios that require students to ‘use chemistry’ to explain phenomena, evaluate evidence, or make decisions (Parchmann et al., 2018). Examples range from analysing atmospheric chemistry through air pollution case studies to explaining the lack of a lather when using soap with hard water and exploring redox reactions using rechargeable battery technologies. Large curriculum projects such as Salters and Salters-Nuffield have demonstrated how whole units and courses can be built around strongly connected contexts that anchor conceptual progression.

Across studies published between 2000 and 2025, one of the most consistent findings is the positive impact of contextualisation on student motivation, interest, and perceived relevance. Learners routinely report that chemistry is more engaging and worthwhile when connected to environmental issues, pharmaceutical development, food chemistry, energy transitions, and local community challenges (Bennett et al., 2007; King & Ritchie, 2016). Socio-scientific contexts appear particularly effective because they invite ethical, economic, and environmental reasoning along with chemical explanations, offering a broader sense of purpose.

The cognitive benefits of contextualisation, while well-documented, are more dependent on duration and instructional design. Short, isolated lessons often yield minimal conceptual gains compared with traditional teaching that is delivered effectively (Prins et al., 2017). However, research has repeatedly found that longer sustained contextualized teaching, especially when integrated across multiple lessons or units, leads to significant improvements in conceptual understanding, problem-solving ability, and transfer to unfamiliar tasks (Bennett et al., 2005; Parchmann et al., 2018).

These effects can be explained through two mechanisms. First, increased motivation enhances willingness to engage in cognitively demanding tasks. Second, exposure to multiple meaningful contexts strengthened students’ internal networks of cues, enabling them to draw on chemical principles more flexibly.

Teacher expertise plays a central role in determining whether contextualisation yields such benefits. Implementation studies show that teachers require strong pedagogical content knowledge (PCK), adequate time for planning, and access to high-quality materials in order to design contexts that preserve conceptual rigour (Acar & Yaman, 2013; Acar & Yaman, 2011). Many teachers report challenges in balancing contextualised teaching with pressures associated with content-heavy A-level examinations. When summative assessments primarily reward algorithmic problem solving or rote recall, learners may not see value in the deep, applied reasoning that contextualisation encourages.

To overcome these challenges, literature provides several guidance points for teachers and curriculum designers. First, contexts must carry epistemic weight: they should require students to actively apply chemical models to explain or predict outcomes rather than simply decorating traditional tasks with real-world narratives. Industrial catalysis, water purification, energy storage, and medical development are examples of contexts with strong conceptual relevance.

Second, sequencing is important. Students benefit the most when they encounter a given chemical idea across multiple contexts. For example, kinetics can be explored through enzyme catalysis, industrial optimisation, and food spoilage, three contexts that highlight different variables, representations, and applications. This heterogeneity supports flexible transfers and a more robust schema formation.

Third, contextualised learning must be accompanied by explicit guidance that helps students abstract core ideas from specific scenarios. A well-established pattern is to move from context → model → representation → explanation. Without this structured movement, learners may remain focused on the surface features of the context, instead of developing a transferable chemical understanding.

Fourth, assessment of alignment is essential. When classroom tasks and internal assessments reward explanation, modelling, argumentation, and applied reasoning, students recognise the value of contextual learning. In contrast, when students are assessed solely on symbolic manipulation or memorisation, contextualisation struggles to influence learning behaviour. Research underscores that meaningful change occurs when assessment practices reinforce the intellectual work of contextualised chemistry (King & Ritchie, 2016).

Finally, professional teacher learning is indispensable. Successful contextualisation requires training in curriculum design, access to exemplars, collaborative planning structures, and time for reflection and redesign. Professional development programmes, such as those documented by Dolfing et al. (2013), demonstrate that when teachers receive sustained support, contextualised curricula can be implemented with high fidelity and strong student outcomes.

Exemplar Teaching Sequence: Introducing Ksp Through Everyday Contexts

Contexts: Kettle limescale + soap scum formation.

1. Elicit Prior Knowledge (2–3 minutes)

• Ask students why kettles build up white deposits and why soap behaves differently in “hard water.”
• Gather intuitive explanations (e.g., minerals and dirty water).

2. Demonstrate the Phenomena (5 minutes)

• Show a short video or images of kettle scaling.
• Mix a small sample of hard water with soap solution → observe scum.
• Students record observations and not explanations.

3. Link to Ionic Chemistry Foundations (3–4 minutes)

• Review dissolution equilibria using a simple salt (e.g., CaCO₃(s) ⇌ Ca²⁺ + CO₃²⁻).
• Emphasis: Sparingly soluble salts quickly reach equilibrium.

4. Introduce the Solubility Product Ksp (5 minutes)

• Define Ksp as the equilibrium constant for dissolving a solid.
• Write expressions for CaCO₃, Mg (OH)₂, etc.
• Highlight that higher ion concentrations → precipitation when Q > Ksp.

5. Apply to the Kettle Scaling Context (5 minutes)

• Discuss heating water: CO₂ loss → increased CO₃²⁻ → exceeds Ksp → CaCO₃(s) precipitates.
• Perform a quick numerical example: calculate if precipitation occurs when given [Ca²⁺] and [CO₃²⁻].
• Ask students to predict how descalers (acids) will reverse this process.

6. Apply to Soap Scum Formation (5 minutes)

• Link soap anion (RCOO⁻) reacting with Ca²⁺/Mg²⁺.
• Precipitate forms when the [Ca²⁺][RCOO⁻]² > Ksp of calcium stearate.
• Short calculation: compare Q vs. Ksp.
• Ask why soft water prevents scum.

7. Mini-Investigation (10–15 minutes)

• Students test “model hard water” with varying Ca²⁺ concentrations.
• Add soap solution and measure turbidity or mass of the precipitate.
• Predict and justify outcomes using Ksp logic.

8. Consolidation and Generalisation (3–4 minutes)

• Build a concept map: dissolution → equilibrium → Ksp → Q vs Ksp → real-world outcomes.
• Link back to earlier observations (kettles + soap)

9. Quick Exit Check (1 minute)

Students answer one of:

• When does CaCO₃ form scale?
• Why does soap scum form in hard water, but not in soft water?
• What does Q > Ksp tell you?

Despite its strengths, contextualisation remains susceptible to certain misconceptions. It is not a simplification strategy; rather, when performed well, it increases conceptual demand by requiring students to justify, model, and connect ideas. It is also not a superficial one-off “starter activity” but a sustained pedagogical approach requiring intentional sequencing. Moreover, not all contexts are equally effective in this regard. Novelty alone is insufficient; authenticity and conceptual alignment drive learning gains (Broman 2022).

Overall, the accumulated evidence is clear: contextualisation can substantially improve both affective and cognitive outcomes in A-level chemistry when thoughtfully implemented. Teachers aiming to enhance their practice might begin by redesigning a single unit, for example, on equilibrium or redox chemistry, embedding two or three complementary contexts that demand explanation, providing structured abstraction, and including at least one contextualised assessment task. Over time, iterative refinement and departmental collaboration can build a coherent, context-rich curriculum that supports relevance, rigour, and retention.

Contextualisation is more than a pedagogical trend; it is a research-informed approach that aligns chemistry teaching with how students make sense of the world. By helping learners see chemistry as a living, applicable discipline, teachers can cultivate a deeper understanding, stronger motivation, and greater confidence, outcomes that are as academically beneficial as they are personally empowering.

References.

Acar, O., & Yaman, M. (2011). The effects of context-based learning on students’ motivation and learning outcomes in chemistry. International Journal of Science Education 33(9): 1235–1256.

Bennett, J., Gräsel, C., Parchmann, I., & Waddington, D. (2005). Context-based teaching and learning of chemistry: A review of literature. International Journal of Science Education 27(6): 737–758.

Bennett, J., Lubben, F., & Hampden-Thompson, G. (2007). Schools that make a difference to students’ attitudes to science. International Journal of Science Education, 29(14), 1819–1840.

Dolfing, R., Bulte, A. M., & Pilot, A. (2013). A framework for teachers’ professional development in context-based chemistry education. International Journal of Science Education, 35(10), 1615–1640.

Gilbert, J. (2006). The nature of context-based chemistry education. International Journal of Science Education, 28(9), 957–976.

Karolina Broman, Sascha Bernholt & Camilla Christensson (2022) Relevant or interesting according to upper secondary students? Affective aspects of context-based chemistry problems. Research in Science & Technological Education, 40:4, 478-498, DOI: 10.1080/02635143.2020.

King, D. and Ritchie, S. (2016). Learning science through real-world contexts. Teaching Science, 62(3), 28–35.

Parchmann, I., Gräsel, C., & Bögeholz, S. (2018). Science education and competence development in context. International Journal of Science Education 40(10): 1171–1189.

Prins, G., Bulte, A., Pilot, A. (2017). Designing context-based chemistry units. Journal of Chemical Education 94(9): 1174–1182.