Advanced Chemical Principles and Molecular Dynamics · 6th Year · Stoichiometry and the Mole Concept · Summer Term

Renewable and Non-Renewable Energy

Students will learn about different sources of energy, distinguishing between renewable (e.g., solar, wind) and non-renewable (e.g., fossil fuels) sources.

• NCCA Curriculum Specifications
• NCCA: Primary Science Curriculum - Environmental Awareness and Care

About This Topic

Renewable and non-renewable energy sources form a key distinction in chemistry, as students classify sources by their ability to replenish on human timescales. Renewable sources, such as solar radiation captured by photovoltaic cells, wind driving turbines, and biomass from plant matter, contrast with non-renewable fossil fuels like coal, oil, and natural gas, which originate from ancient organic remains and release stored chemical energy through combustion reactions. In Ireland's context, students connect this to the national grid's growing reliance on wind and solar, while fossil fuels still dominate imports. Key chemical principles include exothermic reactions in fuel burning and electrolysis for hydrogen from water using renewable electricity.

This topic integrates with stoichiometry by calculating energy yields from mole-based combustion equations and mole ratios in biofuel production. Students explore environmental impacts, such as CO2 emissions contributing to climate change, fostering informed views on sustainable chemical processes. It builds analytical skills for evaluating energy policies and resource management.

Active learning suits this topic well. Students engage concepts through models of energy conversion, data analysis of local usage, and debates on transition strategies. These methods make abstract renewability timelines and chemical efficiencies concrete, encouraging ownership of scientific arguments and real-world applications.

Key Questions

1. Where does the energy we use come from?
2. What is the difference between renewable and non-renewable energy?
3. Why is it important to use more renewable energy?

Learning Objectives

• Compare the chemical energy stored in fossil fuels versus biofuels based on combustion data.
• Calculate the mass of carbon dioxide produced per kilowatt-hour for different energy sources using stoichiometric equations.
• Evaluate the environmental impact of energy generation methods by analyzing life cycle assessment data.
• Classify energy sources as renewable or non-renewable based on their replenishment rate and origin.
• Design a simple model demonstrating the conversion of solar or wind energy into electrical energy.

Before You Start

Chemical Reactions and Equations

Why: Students need to understand how to write and balance chemical equations to calculate energy yields from combustion and other relevant reactions.

The Mole Concept and Avogadro's Number

Why: Calculating energy yields and material requirements for biofuel production requires a solid understanding of mole calculations.

States of Matter and Energy

Why: Understanding energy transfer and the different states of matter is foundational for grasping how energy is stored and released in fuels.

Key Vocabulary

Combustion	A chemical process that involves rapid reaction between a substance with an oxidant, usually oxygen, to produce heat and light. This is how fossil fuels release energy.
Photosynthesis	The process used by plants and other organisms to convert light energy into chemical energy, stored in organic compounds. This is the basis for biomass as a renewable energy source.
Electrolysis	A process that uses electricity to split compounds. It can be used to produce hydrogen from water, often powered by renewable electricity.
Carbon Footprint	The total amount of greenhouse gases, primarily carbon dioxide, released into the atmosphere by a particular activity, person, or organization.

Watch Out for These Misconceptions

Common Misconception

Renewable energy is always cheaper and available everywhere.

What to Teach Instead

Renewables have upfront costs and depend on weather; initial investments pay off long-term. Hands-on audits of school solar vs grid power reveal variability, helping students analyze cost-benefit through data graphs and peer comparisons.

Common Misconception

Fossil fuels are 'natural' and harmless because they come from the earth.

What to Teach Instead

Combustion produces CO2 and pollutants via oxidation reactions. Demonstrations with candle burning and gas collection show gas emissions, while group discussions link to greenhouse effects, correcting views with evidence.

Common Misconception

Nuclear energy is renewable.

What to Teach Instead

Uranium fuel is finite, mined like fossils. Sorting activities and timeline models clarify depletion rates, with debates reinforcing that fission relies on non-replenishable isotopes.

Active Learning Ideas

Card Sort: Energy Source Classification

Provide cards with images and descriptions of 12 energy sources. In pairs, students sort into renewable and non-renewable piles, then justify choices using criteria like replenishment time and chemical origin. Follow with whole-class share-out to resolve edge cases like biofuels.

30 min·Pairs

School Energy Audit

Teams measure electricity use from appliances over a day using meters or bills. Convert data to kWh, estimate carbon footprints with conversion factors, and propose renewable swaps like solar panels. Present findings on posters.

45 min·Small Groups

Combustion vs Solar Model

Pairs build simple models: burn a nut for fossil fuel analog, measure temperature rise; construct solar oven with foil and black paper to heat water. Compare energy outputs and discuss renewability.

40 min·Pairs

Policy Debate Prep

Small groups research Ireland's energy mix data, prepare arguments for phasing out non-renewables. Debate in rounds, using evidence from stoichiometry calculations on fuel efficiency.

50 min·Small Groups

Real-World Connections

• Chemical engineers at Bord na Móna are developing new methods for processing peat and biomass into sustainable fuels, aiming to reduce Ireland's reliance on imported fossil fuels.
• Wind farm technicians in County Clare monitor and maintain turbines, ensuring efficient conversion of wind energy into electricity for the national grid, a key component of Ireland's renewable energy strategy.
• Environmental consultants analyze the carbon footprint of new industrial projects, advising companies on the most sustainable energy choices and compliance with emissions regulations.

Assessment Ideas

Quick Check

Provide students with a list of energy sources (e.g., coal, solar panel, natural gas, wind turbine, wood pellets). Ask them to categorize each as renewable or non-renewable and write one sentence justifying their choice for three of the sources.

Discussion Prompt

Pose the question: 'Given Ireland's geographical advantages, why is transitioning to 100% renewable energy a complex challenge?' Guide students to discuss factors like energy storage, grid stability, and the chemical processes involved in current energy generation.

Exit Ticket

Students write down one specific chemical reaction related to energy production (e.g., combustion of methane, splitting of water) and identify whether the reactants are derived from a renewable or non-renewable source.

Frequently Asked Questions

How do I teach renewable vs non-renewable energy sources effectively?

Start with familiar examples like Ireland's wind farms versus imported gas. Use classification sorts and combustion demos to highlight chemical differences. Link to stoichiometry by balancing fuel equations, showing moles of CO2 per energy unit. This builds from concrete to abstract understanding.

What are good hands-on activities for energy sources in chemistry?

Card sorts classify sources quickly. Energy audits quantify school usage and footprints. Model comparisons, like solar ovens versus fuel burning, demonstrate efficiencies. These tie chemical reactions to sustainability, making lessons memorable and relevant to Leaving Cert exams.

How can active learning help students grasp renewable energy concepts?

Active methods like building solar models or debating policy engage multiple senses and promote discussion. Students calculate real outputs from their experiments, confronting variability in renewables firsthand. Group audits reveal patterns in data that lectures miss, deepening systems thinking and retention for advanced applications.

Why focus on renewable energy in Ireland's chemistry curriculum?

Ireland aims for 70% renewables by 2030, per government targets. Students analyze chemical processes like electrolysis for green hydrogen or biomass fermentation. This connects stoichiometry to national goals, preparing them for sustainable industry roles and informed citizenship.