However, suppose that you could collect all the oxygen in the air that was combined with the log during the burning and all the smoke and gases that escaped from the burning log and measure their masses, too.In fact, the mass of the ashes is less than that of the log.At first, you might think that matter was lost during this change because the pile of ashes looks much smaller than the log did.Suppose you burn a large log until nothing is left but a small pile of ashes.A similar chemical change produces caves and the icicle shaped rock formations that often are found in them.It changes into a new substance, calcium hydrogen carbonate, which does dissolve in water.However, when the water is even slightly acidic, as it is when it contains some dissolved carbon dioxide, calcium carbonate reacts.
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