A student was asked to determine the activity of four unknown metals, W,X,Y, and Z. They are given the metals and four nitrate solutions of the unknown metals. The nitrate are shown across the top of the chart. They place each metal in each compound except where there is a dashed line--, as shown in the chart. Unknown Appearance W(NO3)2 X(NO;)2 Y(NOɔ)2 ZNO, Becomes Metal Shiny, copper No reaction No reaction Silvery Веcomes Silvery Becomes Shiny, silver Darkens Flaky coating Y Shiny, silver Darkens No reaction Silvery Shiny, silver No reaction No reaction No reaction Based on the data, how should the student list the metals from least to most active? O Z-W-Y-X O X-Y-W-Z O Z-Y-W-X O X-W-Y-Z

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Crime Scene Investigation

A crime scene refers to a place where a crime has occurred. The purpose of crime scene investigation (CSI) is to analyze the complete scene and catch the culprit based on the pieces of evidence collected from the place of crime. The people involved in this process are referred to as crime scene investigators.