MediumChemistryHigh School (11–12)Atoms and Molecules › Measurement, Units and Significant FiguresNumericalBoard Exam
A glass slab measures 12.50 cm × 4.20 cm × 0.85 cm, and its mass is 111.6 g…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A glass slab measures , and its mass is . Find its volume and its density, each with the right number of significant figures.
Need a reminder? The key ideaShow
Non-zero digits are significant. Zeros between them are significant. Zeros at the left are not. Zeros at the right count only after a decimal point. Sums keep the fewest decimal places; products keep the fewest significant figures.
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. . The length has 2 significant figures, so the volume is .
Step 2. Density. . The volume limits us to 2 figures: .
Answer: and .
Discussion (0)
Log in to join the discussion.
Loading…