The answer is 4.
Gases have low densities, because of the increased space between hight-energy particles.
A compound is a substance that can be separated into simpler substances only by chemical means.
Answer:
Adding salt to the water increases the density of the solution because the salt increases the mass without changing the volume very much. When you add table salt (sodium chloride, NaCl) to water, the salt dissolves into ions, Na+ and Cl-. The volume increases by a small factor, but the mass increases by a bigger factor.
Explanation:
Making toast is a physical change.
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