BC has the cross-sectional area of 20 mm? and is made of aluminum alloy with Young's modulus E=80 GPa. Answer the following questions: a) Find the reaction forces at A? b) Determine the stress at BC? c) Determine the elongation of BC? d) Determine the strain at BC? 400 mim 150 mm B 70 N-m 200 turu

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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.