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Chalk is heated strongly. Carbon dioxide gas is released leaving calcium oxide. ... Reaction 3: When carbon dioxide gas is passed through the calcium hydroxide solution a white precipitate is formed.
Sidewalk chalk contains a compound called calcium carbonate (CaCO3), which reacts with vinegar (acetic acid, CH3COOH) to form the gas carbon dioxide (CO2). Some of the mass of the chalk is lost to form this gas, making it smaller.
You will have noticed that the reaction with the broken-up chalk happens much quicker than the solid piece of chalk, as seen by how quickly the bubbles are produced. This is because the reaction needs to have vinegar and chalk molecules colliding together to complete. When the chalk is broken up, more surface area is created on the small pieces for the reaction to occur.
Explanation:
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