Atrain travels 74 kilometers in 3 hours, and then 73 kilometers in 2 hours. what is its average speed? km/hr

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?

A40 kilogram skier starts at the top of a 12 meter high slope. at the bottom, she is travelling 10 meters per second. how much energy does she lose to friction

Witch two conditions can limit the usefulness of the kinetic molecular theory in describing gas behavior?