1. Why is it an advantage to run cars on liquid fuels, such as petrol, rather than solid fuels, such as coal or wood? 2.Explain why the density of a metal object decreases when the object expands.

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An empty fuel tank can still contain and therefore can be even more dangerous than one full of liquid fuel.

Achange in the number of neutrons in an atom will change an blank . when the number of protons changes in an atom, a new element will form.

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?