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| CHECKLIST: INVESTIGATIONSUBJECT: ACID RAIN | |||
| CRITERIA | | ||
| 1. I started doing research in good time. | Yes | No | |
| 2. I have worked through and have followed all the steps (1 to 7). | Yes | No | |
| 3. I have used more than one source and have attached a list of sources. | Yes | No | |
| 4. I have widened my knowledge of the subject and have made meaningful suggestions. | Yes | No | |
| 5. I enjoyed doing research on this specific subject. | Yes | No | |
| PROBLEM s I have encountered : |
HAVING FUN WITH ACIDS AND BASES
Try the following at home and report your findings to the class.
SECRET WRITING
Use lemon juice as ink and write some message on a piece of white paper, then leave it to dry. Hold the paper close to a heater for approximately 5 minutes. (Take care that you do not come too close!) The writing will become legible because the lemon juice will react with the starch in the paper to form a brown sugar.
MAKING FOAM
Drip a little vinegar onto 10 ml of bicarbonate of soda. What do you observe? Add some more vinegar. Find out how the principle that is demonstrated here is used for extinguishing fires.