Question

How many significant figures are in 1009.630mL?

Select one:
a. 5
b. 6
c. 3
d. 4
e. 7

Answer 1

The measurement 1009.630 mL has seven significant figures. Significant figures include all non-zero numbers, any zeroes between significant figures, and any trailing zeroes after the decimal point when they follow a significant figure.

Step-by-step explanation:

The measurement 1009.630 mL contains seven significant figures. This is because every non-zero digit is significant, and any zeros between non-zero digits or after the decimal point and a non-zero digit are also significant. The leading zero before the decimal point is not significant. Let's apply these rules to some practice numbers:

• 0.0009 has one significant figure.
• 15,450.0 has six significant figures.
• 6x10³ has one significant figure (scientific notation).
• 87.990 has five significant figures.
• 30.42 has four significant figures.

Here's how to round numbers to three significant figures:

• 0.0004505 rounded to three significant figures is 0.000451.
• 0.00045050 rounded to three significant figures is 0.000451.
• 7.210 × 10⁶ rounded to three significant figures is 7.21 × 10⁶.
• 5.00 × 10-6 rounded to three significant figures is 5.00 × 10-6 (because in scientific notation, all digits are significant).