Problem 2: Fluid pumping process. PS1 Tank Tank B. dund The process involves pumping fluid from tank A to tank B. Before starting, PS1 must be closed. When the start button is pushed, the pump starts. PS2 and PS3 must be closed 5 s after the pump starts. If either PS2 or PS3 opens, the pump will shut off and will not be able to start again for another 14 s. Cepynght 2017&-Orm-R o Al rgh sened Ne reproducti i the ps on e of Mc-Cron ISal Edce

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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.