Question

how many significant figures are in the measurement 0.002 ml? * 5 points
1
2
3
4
how many significant figures are in the measurement 5,000,000.0 kilometers? * 5 points
1
2
3
4
5
6

Explanation:

Step1: Recall significant - figures rule for leading zeros

Leading zeros (zeros before non - zero digits) are not significant. In 0.002 mL, the zeros before 2 are leading zeros. So, the only significant figure is 2.

Step2: Recall significant - figures rule for trailing zeros with a decimal

In 5,000,000.0 kilometers, trailing zeros after a decimal point are significant. All the digits 5, 0, 0, 0, 0, 0, 0 and the decimal - point are significant. So, there are 8 significant figures, but this is not in the options. However, if we consider the rules strictly for the given options, non - decimal trailing zeros may be considered as just place - holders. But since there is a decimal point at the end, all digits are significant and we count them. The number of significant figures is 8, but among the given options, we note that the presence of the decimal implies precision and all digits are significant.

Answer:

1. A. 1
2. E. 8 (but since not in options, if we assume non - decimal trailing zero rule misinterpreted in options, we note the correct concept of significant figures with decimal at end implies all digits are significant)