Explain what happens to the particles in a substance during a physical change.

When a physical change occurs, the arrangement of particles within the substance may change, but the atoms in the molecules remain bonded together.

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we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).

the ratio of the conjugate base to the acid required to attain the desired ph.