Question

7 report the measurement below, in milliliters, to the correct number of significant figures.
6.57 ml
678 ml
6.78 ml
67 ml

Explanation:

Step1: Identify scale division

The graduated - cylinder has markings such that each major division is 1 mL and each minor division is 0.1 mL.

Step2: Read the meniscus

The bottom of the meniscus is between 6.7 mL and 6.8 mL and is closer to 6.7 mL. We estimate one digit beyond the smallest division on the instrument. So the measurement is 6.78 mL considering the correct number of significant figures.

Answer:

6.78 mL