MediumChemistryHigh School (11–12)Atoms and Molecules › Measurement, Units and Significant FiguresMixtures and Solutions › Elements, Compounds and ChangesNumericalBoard Exam
A ring has a mass of 10.5 g. Nikhil lowers it into a measuring cylinder, and the water level rises…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A ring has a mass of . Nikhil lowers it into a measuring cylinder, and the water level rises from to . Silver has a density of and gold of . Find the density of the ring. Could it be pure silver?
Need a reminder? The key ideaShow
Density is mass per unit volume, . The volume of an odd-shaped solid is the rise of the water level when the solid is lowered into a measuring cylinder. .
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. Volume. .
Step 2. Density. .
Step 3. Compare. This matches silver. A ring of gold of the same size would have a mass of about .
Answer: and , so it could be pure silver.
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