What happens in a double replacement reaction

What is the equilibrium constant of aa+bb=cc+dd

According to the vsepr theory what is the shape of a molecule that has a central atom valence three other items with no lone pairs of electrons

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