Lab: Physical and Chemical Changes
Type a document answering the following questions: 1. What is your hypothesis of the lab? 2. What materials were used in the lab? 3. Was there a reaction during the lab? 4. What was the procedure in the lab? 5. What was the conclusion of the lab? 6. What did you learn from this lab?
1. My hypothesis for the lab is that there will be both physical and chemical changes observed during the experiment.
2. The materials used in the lab were:
- Baking soda (sodium bicarbonate)
- Vinegar (acetic acid)
- Water
- Glass beaker
- Measuring spoons
- Stirring rod
- Thermometer
- Test tubes
- Burner or stove (for optional heat source)
3. Yes, there was a reaction observed during the lab. When the baking soda and vinegar were mixed together, there was a noticeable fizzing and bubbling, indicating a chemical reaction.
4. The procedure in the lab was as follows:
- Measure 10 ml of vinegar using a measuring spoon and pour it into a glass beaker.
- Measure 10 grams of baking soda using a different measuring spoon and add it to the vinegar in the beaker.
- Observe and note any changes that occur, such as fizzing or bubbling.
- Optionally, heat the mixture gently using a burner or stove and observe any changes that occur.
- Record the temperature of the mixture before and after any observable changes.
- Repeat the procedure multiple times for accuracy and reliability.
5. The conclusion of the lab was that the reaction between baking soda and vinegar resulted in the release of carbon dioxide gas, as evidenced by the fizzing and bubbling. The reaction was confirmed to be a chemical change.
6. From this lab, I learned that chemical changes result in the formation of new substances with different properties. The release of carbon dioxide gas during the reaction between baking soda and vinegar was a clear indication of a chemical change taking place. Additionally, I learned the importance of accurately measuring and recording data during experiments to ensure reliable results.