XCu versus temperature, liquid-solid phase- equilibrium diagram of a system consisting of Ag and Cu is given. a) Identify each zone and point O b) Define the temperatures T1, T2 and T3 c) Find the degrees of freedom for the points R, T, U, V and Y (f).

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Properties of Pure Substances

A substance with fixed chemical composition throughout is called a pure substance like water, air, and nitrogen. A pure substance does not have to be a single element or compound. A mixture of two or more phases of a pure substance is also a pure substance as long as the chemical composition is the same for all phases. These substances mainly have a constant/ uniform composition. The substances also have fixed boiling and melting points. A pure substance takes part in a chemical reaction to form predictable products.