2. what was the importance of mendeleev's periodic table to chemists?
it determined the mass of every known element.
it provided a pattern of repeating properties for the elements.
it scientists discover previously unknown elements.
it define an element.

Idon’t understand this page, can someone ?

Why is soap used to remove grease? a. its nonpolar end dissolves the grease. b. it makes the water bond with the grease. c. it chemically bonds with the grease. d. its polar end dissolves the grease.correct answer for apex - a, its nonpolar end dissolves the grease.

What is the standard unit of measure for acceleration?