From the reaction: B2H6 + O2 HBO2 + H2O What mass of O2 will be needed to burn 22.4 g of B2H6?​

Check the correct box to describe the periodic trends in electronegativity. electronegativity across a period: decreases. increases. electronegativity down a group: decreases. increases.

Can someone me with 3 and 4 plz. this is for masteries test.

Energy defines the different "states" of matter. in no more than 3 sentences, describe the amount of kinetic energy that each of the 3 states of matter possesses and relate that to the atom/molecular motion of each "state".