A student is given four solid samples labeled w, x, y and z. all have a metalic luster. she is told that thed solid could be gold, led sulfied ( PBS), quartez which is Si O2, and Iodine the reulst investgation are w is a good electerical condactar, X,Y and ZR are poor electical condacter. ( b) when the soliders are hit with a hummer, w flatens out, x shaters in to many pieces, w is smashed in to a powder and z is not affected. ( c when the solide are hited with the bunsen burner, w melts with sublimation, but x w and z dont melt. ( d) in treatment with 6 M HNO3, x desoves: there is no effect on w, y, or z. on the bases of this results idenitfy the solids
sample w: sample x sample y sample z
A. AU A. Au A. Au A. Au
B. PbS B. PbS B. PbS B. PbS
C. SiO2 C. SiO2 C. SiO2 C. SiO2
D. I2 D. I2 D. I2 D. I2
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