Core Skills Analysis
Science
Megan conducted a series of dry‑ice experiments, observing how the solid carbon dioxide sublimated directly into gas and caused rapid cooling of surrounding materials. She noted the formation of fog when water vapor condensed on the cold gas and measured temperature drops using a thermometer, demonstrating an understanding of phase changes and heat transfer. By handling dry ice safely, she practiced laboratory safety protocols such as using gloves and goggles. Through these activities, Megan learned the basic principles of states of matter, the properties of carbon dioxide, and the scientific method of making predictions, observing, and recording results.
Mathematics
During the experiments, Megan recorded temperature readings at one‑minute intervals and plotted them on a graph to visualize the rate of cooling. She calculated the average temperature change per minute and compared the results of different quantities of dry ice, applying concepts of average rate, proportion, and basic statistics. By measuring the volume of fog produced, she practiced estimating and converting units. This work reinforced her skills in data collection, representation, and interpretation.
English (Writing)
Megan wrote detailed observation notes for each dry‑ice trial, describing the setup, safety steps, what she saw, and the numerical data she collected. She organized her report with headings, a hypothesis, a method section, results, and a conclusion, practicing clear scientific communication. Her writing included precise vocabulary such as "sublimation," "condensation," and "thermal energy," expanding her technical language repertoire.
Tips
1. Extend the investigation by comparing dry ice with other cooling agents like ice water to discuss heat capacity differences. 2. Have Megan design a simple experiment to measure how long fog lasts under various room temperatures, turning the activity into a mini‑research project. 3. Invite her to create a short video tutorial demonstrating safe handling of dry ice, reinforcing both scientific concepts and communication skills. 4. Connect the experiments to real‑world applications by exploring how dry ice is used in food preservation, theater effects, and space missions.
Book Recommendations
- The Big Book of Science Experiments by Rebecca L. Jones: A hands‑on guide with over 100 easy experiments, including several that use dry ice, perfect for curious 12‑year‑olds.
- The Magic of Reality: How We Know What's True by Richard Dawkins: An engaging look at scientific principles, with clear explanations of states of matter and phase changes.
- How Things Work: The Physics of Everyday Life by Louis A. Bloomfield: Explains the science behind everyday phenomena, helping students link dry‑ice experiments to real‑world physics.
Learning Standards
- Science – Working scientifically (National Curriculum Key Stage 3: 3.1, 3.2) – investigating properties of materials, measuring, recording, and evaluating data.
- Science – States of matter (3.3) – understanding phase changes such as sublimation.
- Mathematics – Statistics and probability (Key Stage 3: 3.6) – collecting, presenting, and interpreting data in tables and graphs.
- Mathematics – Number (3.2) – calculating averages, rates, and unit conversions.
- English – Writing (Key Stage 3: 3.1) – producing clear, structured scientific explanations with appropriate terminology.
Try This Next
- Worksheet: Create a data table to log temperature, time, and fog volume for each trial, then calculate the average cooling rate.
- Quiz: Draft 5 multiple‑choice questions on phase changes, safety rules, and the properties of carbon dioxide.
- Drawing task: Sketch the experimental setup and label each part, including safety equipment and the path of gas.
- Writing prompt: Compose a short lab report conclusion explaining why dry ice sublimates and how it can be used safely.