Photosynthesis Word Equation
The word equation for photosynthesis is:
\$CO2 + H2O \;\rightarrow\; C6H{12}O6 + O2\$
Analogy: Photosynthesis as a Kitchen 🍽️
Think of a plant as a tiny kitchen. It takes in carbon dioxide (the “air” ingredient) and water (the “liquid” ingredient). With the help of sunlight (the stove’s heat), the plant mixes these ingredients to bake glucose (the food) and releases oxygen (the fresh air) as a by‑product.
Key Points for the IGCSE Exam
- Remember the word equation – it’s what the exam will ask for.
- Use the correct chemical symbols:
CO₂, H₂O, C₆H₁₂O₆, O₂. - Explain that sunlight provides the energy needed to drive the reaction.
- Highlight the role of chlorophyll as the “catalyst” that captures light.
- Link the process to air quality – it removes CO₂ and supplies O₂.
Exam Tip Box 📚
Tip: When writing the word equation, write the reactants first, then an arrow, then the products. Keep the order consistent: CO₂ + H₂O → C₆H₁₂O₆ + O₂. This shows you understand the flow of the reaction.
Why Photosynthesis Matters for Air Quality 🌍
- Plants absorb CO₂, a greenhouse gas that contributes to global warming.
- They release O₂, essential for human and animal respiration.
- Urban trees reduce air pollution by trapping particulate matter.
- Forests act as large carbon sinks, helping to balance atmospheric CO₂ levels.
Summary Table of Reactants & Products
| Reactants | Products |
|---|
| \$CO2\$ + \$H2O\$ | \$C6H{12}O6\$ + \$O2\$ |