99.9% of the matter that makes up living organisms consist of how many elements

This is a characteristic of the elements in the periodic table that shows a pattern. it may increase or decrease across or down the table.

Why is nh3 classified as a polar molecule

22. a flask containing 450 ml of 0.50 m h2so4 was accidentally knocked to the floor. how many grams of nahco, do you need to put on the spill to neutralize the acid according to the following equation: h2so4(aq)+2 nahcos(aq) na,so(aq) +2 h20()+2 co2(g) d) 38 g a) 2.3 g b) 9.5 g c) 19 g