February 28

Endothermic & Exothermic Reactions Lab 🔥❄️

📅 Lab Completed: Today
📅 Post-Lab Analysis Due: Monday 3/3 at the End of Class

In this hands-on lab, we explored how energy is absorbed or released during chemical reactions by measuring temperature changes and observing reaction effects.

🔬 What We Did:

1️⃣ Experiment 1: Vinegar & Baking Soda

• Prediction: Will the reaction cause the temperature to rise or fall?

• Mixed vinegar (acetic acid) and baking soda (sodium bicarbonate).

• Measured and recorded temperature changes every few seconds.

• Observed gas production and bubbling.

• Determined if the reaction was endothermic or exothermic based on temperature change.

2️⃣ Experiment 2: Hydrogen Peroxide & Yeast

• Prediction: Will the reaction cause the temperature to rise or fall?

• Mixed hydrogen peroxide (H₂O₂) and yeast to observe its effect.

• Recorded temperature changes over time.

• Noted if heat was released and if bubbling or foaming occurred.

• Determined if the reaction was endothermic or exothermic.

3️⃣ Graphing & Analysis

• Created a graph comparing temperature changes for both reactions.

• Answered questions about energy transfer, chemical reaction signs, and the law of conservation of energy.

🌡️ Key Takeaways:

✅ Endothermic reactions absorb heat, making the surroundings cooler.
✅ Exothermic reactions release heat, making the surroundings warmer.
✅ Observations like gas formation, bubbling, and temperature changes provide evidence of chemical reactions.

✅ Make sure your post-lab analysis is complete and turned in on time! 🧪📊🔥