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Homogeneous mixture.
is it true
Yes, that's basically what happens at the atomic or molecular level.
Solution: A mixture that appears to have the same composition, color, density, and taste, and is mixed at the atomic or molecular level.
Heat, on a molecular or atomic level, is kinetic energy; fast moving particles are literally hotter. So, if a fast moving particle collides with a slower particle, there will be an exchange of energy. We know from basic physics that force equals mass times acceleration, so when a force is applied to a particle, that particle will accelerate. That is how heat is transferred particle by particle. All of this happens on such a small, sub-microscopic scale, that we do not see the mechanics of it, we just see heat being conducted.
Energy release at atomic level when a particle move from one orbit to another.
the difference is that the substances is aparent only on the atomic or molecular level.
A mixture that appears to have the same composition, color, density, and taste, and is mixed at the atomic or molecular level is called a solution.
many many collisions at the atomic/molecular level
7.53 × 10-4 milligrams
A solution is a type of mixture at the molecular/atomic level. Mixtures that are not solutions usually contain particles visible at either the microscopic or macroscopic level.