Question
Which metal did humans utilize
first?Solution
Copper holds the distinction of being the first metal used by humans, dating back over 10,000 years. A copper pendant found in northern Iraq, dated around 8700 B.C., underscores copper's longstanding utility in human civilization. For nearly five millennia, it was the only metal known and used for various applications.
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A simple method to calculate relative masses for mixtures is the
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