When a solid substance is heated it forms gray foam.
name: Calcium gluconate decomposes under heating.
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When calcium carbonate monohydrate is heated it demonstrates a huge volume expansion. It looks like a grey foam snake and is caused by vaporization of loosely bound water and dehydration of hydroxyl groups of the compound. When calcium gluconate is purolysed at temperature of dry fuel the reaction looks as follows:
2C12H22CaO14 + O2 → 22H2O + 21C + 2CaO + 3CO2
The snake is gray-colored because of the presence of calcium oxide and carbon mixture.