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What defines an open system?

Exchanges heat and matter with surroundings.

What is an example of a closed system?

Heat can be exchanged, but not matter.

What characterizes an isolated system?

No exchange of heat or matter occurs.

What does 'flow of mass' refer to?

The exchange of heat and mass.

How do coefficients differ from subscripts in equations?

Coefficients show quantity; subscripts show composition.

What analogy can describe reactants and products?

Reactants are starting materials; products are final outcomes.