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Diamonds and graphite in pencils are both made entirely from carbon. Why do they have such different properties?

  • A. They have different chemical compositions.
  • B. They do not have different properties.
  • C. They have different cleavage and fracture lines.
  • D. They have different crystalline structures.
  • . A company wishes to evaluate an ore for economic cut point. As a result, the various floats and sinks fractions after separation were assayed for metal content and the distribution of metal in the various density fractions is tabulated as shown below. What is the cut point density? (30 marks) Specific gravity Of test Assay Fractional Weight (wt%) Cumulative (wt%) (%Sn) -2.55 1.50 1.50 0.003 “+2.55-2.60 9.29 10.79 0.04 “+2.60-2.65 26.11 36.90 0.04 ” +2.65-2.70 19.67 56.57 0.04 11.91 68.48 0.17 10.92 0.34 “+2.70-2.75 ” +2.75-2.80 ” +2.80-2.85 “+2.85-2.90 79.40 87.27 7.87 0.37 2.55 89.82 1.30 +2.90 100.00 9.60 10.18 End

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