With your lab partner, design an easy to follow procedure. To earn extra money w

Question

With your lab partner, design an easy to follow procedure. To earn extra money while in college, you take a job at a local consignment shop that regularly buys and sells jewelry from customers. The owner wants to find a fast way of telling whether a piece of jewelry is pure gold, 14 ct., or 22 ct without damaging the jewelry. Knowing that density can be used to identify metals, you look up the values for different types of gold. Your task: design a way to calculate the density of a "gold" chain without damaging the it. In the shop, you find a basic chemistry set that contains: a balance, a large graduated cylinder, a beaker, a ruler, aqua regia (a caustic chemical that dissolves gold, d = 1.24 g/mL), table salt, and metal file.

Explanation / Answer

you just weight the sample on weighing scale and find it mass m

now take water in cylinder mark the line and get volume v1
now put gold chain in it and mark the line on cylinder v2

now water displaced or volume change will be equal to the volume of chain

V = v1-v2

now divide mass by volume and get density density of chain = m/V

compare it with the one given in table

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