A researcher measures Vickers hardness (HV) and electrical resistivity for four…

CHEMISTRY · Single correct · AP · Chemistry · Compound Structure and Properties · Compound Structure and Properties

Problem

A researcher measures Vickers hardness (HV) and electrical resistivity ρ\rho for four copper-based samples. Pure copper has HV=70\text{HV}=70 and ρ=1.7×10−8 Ω m\rho = 1.7\times 10^{-8}\,\Omega\,\text{m}. Sample W: HV=70\text{HV}=70, ρ=1.7×10−8 Ω m\rho = 1.7\times 10^{-8}\,\Omega\,\text{m} Sample X: HV=150\text{HV}=150, ρ=1.9×10−8 Ω m\rho = 1.9\times 10^{-8}\,\Omega\,\text{m} Sample Y: HV=155\text{HV}=155, ρ=4.5×10−8 Ω m\rho = 4.5\times 10^{-8}\,\Omega\,\text{m} Sample Z: HV=70\text{HV}=70, ρ=4.6×10−8 Ω m\rho = 4.6\times 10^{-8}\,\Omega\,\text{m} Which sample is most likely an interstitial alloy of copper? (a) Sample X (b) Sample Y (c) Sample Z (d) Sample W

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