Question

the reliability of a measurement and significant figures

1. read each measurement to the correct number of significant figures. note: laboratory glassware should always be read from the bottom of the meniscus.

Explanation:

Step1: Analyze figure (a)

The meniscus in figure (a) is at 72.0 mL. The last digit (0) is an estimated digit. So the measurement is 72.0 mL with 3 significant figures.

Step2: Analyze figure (b)

The meniscus in figure (b) is at 8.50 mL. The last digit (0) is an estimated digit. So the measurement is 8.50 mL with 3 significant figures.

Step3: Analyze figure (c)

The meniscus in figure (c) is at 570 mL. The zero here is significant as it is between non - zero digits. So the measurement is 570 mL with 3 significant figures.

Answer:

(a) 72.0 mL (3 significant figures), (b) 8.50 mL (3 significant figures), (c) 570 mL (3 significant figures)