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2. (15 points) "Speculum metal" is a form of bronze composed of 2 parts copper and 1 part tin, which can be polished to
Posted: Thu Feb 17, 2022 11:12 am
by answerhappygod
- 2 15 Points Speculum Metal Is A Form Of Bronze Composed Of 2 Parts Copper And 1 Part Tin Which Can Be Polished To 1 (50.36 KiB) Viewed 26 times
2. (15 points) "Speculum metal" is a form of bronze composed of 2 parts copper and 1 part tin, which can be polished to a highly reflective colorless surface--because of this property, speculum metal was used for centuries to make mirrors. In the alloy structure, tin atoms substitute 1/3 of the positions in a ccp/fcc lattice of copper. a. Prove mathematically that identical atoms in a ccp/fcc structure occupy 74.0% of the space when considered as hard spheres of radius r. Volume of a sphere = V = 3 a b. Use the metallic radius of copper (128 pm) and its atomic weight (63.456 amu) to calculate the density of pure copper metal in g/cm. Given that the atomic weight of tin is 118.71 amu, and assuming that its metallic radius is identical to that of copper in the alloy, calculate the density of speculum metal. 4 = C.