For the preparation of bao2, we first prepare bacl2 by this reaction [baco3+hcl=bacl2++co2+h2o]after product the (bacl2) then we reacion the bacl2 with h2o2 to product the bao2why we do not use the bacl2 when we have in lab, we preparea fresh bacl2 to prepare bao2? ?

How much energy moves onto the next level, in an energy pyramid

Why do the strengths of london (dispersion) forces generally increase with increasing molecular size? choose one: a. heavier atoms have stronger attractions for each other than lighter atoms. b. dispersion forces are all equal in magnitude; there is no size dependence. c. dispersion forces arise from the attraction between the nuclei of atoms, and larger molecules have larger nuclei. d. dispersion forces arise from dipoles caused by the electron distribution being distorted. larger molecules have more electrons and, therefore, more distortions and a bigger force. e. dispersion forces depend on distance. larger molecules are farther apart and so the forces are smaller.

Why are enzymes important to cells? they bring about chemical reactions. they provide structural support. they form the two layers of membranes. they store large quantities of energy.