What is a light-year?

a.
the distance light travels in one earth year

b.
the distance light travels from the sun to the earth

c.
the distance light travels in one orbit of the moon

d.
the time it takes light to travel across the universe

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?

When a septic tank backs up a goes in to clean it out

Select the correct answer from each drop-down menu. to make a table of the elements, dmitri mendeleev sorted the elements according to their . he then split the list of elements into several columns so that elements beside each other had similar .