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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. |
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Answer» 1. Combustion 2. flames 3. Antacid 4. Histamine 5. Medicines |
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