What will happen if two substances are put into contact in an isolate system?

answer:

though subject internally to its own gravity, an isolated system is usually taken to be outside the reach of external gravitational and other long-range forces.

this can be contrasted with what (in the more common terminology used in thermodynamics) is called a closed system, being enclosed by selective walls through which energy can pass as heat or work, but not mass of substance; and with an open system, which both mass and energy can enter or exit, though it may have variously impermeable walls in parts of its boundaries.

an isolated system obeys the conservation law that its total energy–mass stays constant. most often, in thermodynamics, mass and energy are treated as separately conserved.

explanation:

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answer///carbon;