Question 2. A gas flows through a long pipe of constant diameter. The outlet of the pipe is lower than the inlet, and the pressure of the gas at the outlet is higher than the inlet pressure. The gas temperature is constant throughout the pipe and the system is at steady state (Assume ideal gas behavior). How do: i. The mass flow rates at the inlet and outlet compare? ii. The densities at the inlet and outlet compare? iii. The volumetric flow rates at the inlet and outlet compare? iv. Is the change in potential energy and kinetic energy of the gas positive, negative, or zero?

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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.