There are many cheap gold jewelry on the street for sale. In fact, they are not gold, but copper -zinc alloy, because they have good mechanical properties and gloss.

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1 thought on “There are many cheap gold jewelry on the street for sale. In fact, they are not gold, but copper -zinc alloy, because they have good mechanical properties and gloss.”

  1. Leona

    The quality of hydrogen generated from the law of conservation of quality is: 15g 100g-114.8g = 0.2g
    The quality of zinc participating to the reaction is x, and the quality of sulfuric acid is Y
    zn H2SO4═znso4 H2 H2
    6598 2
    x y 0.2g
    65x = 20.2g
    x = 6.5g
    98y = 20.2g
    y = 9.8g n Copper in alloy samples copper Quality score = 15g? 6.5g15g × 100%= 56.7%
    The mass score of soluble soluble in thin sulfuric acid = 9.8g100g × 100%= 9.8%
    Answer: The mass score of copper in the alloy sample is 56.7%; The mass fraction of the soluble in dilute sulfuric acid was 9.8%.

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