1. how many covalent bonds are expected to form from phosphorus in order to obey the octet rule?

Dumbledore decides to gives a surprise demonstration. he starts with a hydrate of na2co3 which has a mass of 4.31 g before heating. after he heats it he finds the mass of the anhydrous compound is found to be 3.22 g. he asks everyone in class to determine the integer x in the hydrate: na2co3·xh2o; you should do this also. round your answer to the nearest integ

What two categories of toxins were present in the air at dish,texas as a result of the gas pipelines that pass through the area

What is the balance to the equation?