EXERCISE 2 







Problem. What happens in some common physical changes (for example, pulverizing, dissolving, 

 melting, evaporating) ? 



What to use. 1 . Any substance that you know you can pulverize ; any that you know you can dis- 

 solve ; any that you know you can melt ; any that you know you can evaporate. 



2. Any additional things, material, etc. that you need in order to bring these changes about. 



What to do. 1. Pulverize a substance. ^ 



2. Dissolve a substance. 



3. Melt a substance. 



4. Evaporate a substance. 



Record. Make entries in proper spaces of this table. 



Question to think about. In what way are all these changes alike ? 



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