1.

Fill in the Blanks. 1. The chemical process in which a substance reacts with oxygen to produce heat is called _____ 2. Substances which vapourise during burning produce ______ 3. ______ is one that neutralize stomach acid 4. ______ is a chemical messenger involved in number of complex biological reactions. 5. ______ are used to treat the disease and to improve our health. 

Answer»

1. Combustion 

2. flames 

3. Antacid 

4. Histamine 

5. Medicines



Discussion

No Comment Found