Which of the following numbers is correctly rounded to three significant figures, as shown in brackets?
a. 12,556 [12,500]
b. 4.5671 × 10^-9 [4.567 ×10^-9]
c. 3.00072 [3.001]
d. 0.006739 [0.00674]
e. 5.4589 × 10^5 [5.459 ×10^5]

D is correctly rounded to three significant figures.

Explanation:

A is incorrect because although it has 3 significant figures, it is rounded incorrectly. The correct answer would be 12,600.

B is incorrect because is rounded to 4 significant figures instead of three.

C is also incorrect because is rounded to 4 significant figures instead of three.

D is correctly rounded to three significant figures.

E is also incorrect because is rounded to 4 significant figures instead of three.

water and alcohols have similar properties because water molecules contain hydroxyl groups that can form hydrogen bonds with other water molecules and with alcohol molecules, and likewise alcohol molecules can form hydrogen bonds with other alcohol molecules as well as with water.