What is released or absorbed when chemical bonds are broken

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In the 1800s, one of the statements in john dalton's atomic theory was that atoms are indivisible. later experimental evidence led to the discovery of subatomic particles such as neutrons, electrons, and protons. what happened to the indivisible atom part of dalton's atomic theory, and why?

How to convert a density of 0.791g/cm3 to lb/ft3