Which chemical reaction absorbs energy? 1) photosynthesis 2) explosion 3) current produced by a battery 4) combustion of fuels 5) activated hand warmers

Compare the valence electron configuration of the nobles gas elements seen here. what statement is correct?

In 1901, thomas edison invented the nickel-iron battery. the following reaction takes place in the battery. fe(s) + 2 nio(oh)(s) + 2 h2o(l) fe(oh)2(s) + 2 ni(oh)2(aq) how many mole of fe(oh)2, is produced when 5.35 mol fe and 7.65 mol nio(oh) react?

How many moles of al3+ ions are in 1.25 moles of al2o3