Which type of fossil fuel is made from trees, ferns, mosses, and other marsh plants?

coal

petroleum

natural gas

crude oil

Ahypothrticalax type of ceramic material is known to have a density of 2.10 g/cm3 and a unit cell of cubic symmetry with a cell edge length of 0.57 nm. the atomic weights of the a and x elements are 28.5and 30.0 g/mol, respectively. on the basis of this information, which of the following crystal structures is (are) possible for this material: sodium chloride, cesium chloride, or zinc blende

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.

How many grams of ammonia would be produced by the decomposition of 16.93 mlof hydrazine? (the density of hydrazine is 1.021g/ml)