Where do the sun rays hit Earth's surface nearly at right angles ​

Word equation for k(s) +h2o(l) yield koh (aq) + h2

Suppose you mix one mole of sulfuric acid (h2so4) with 1 mole of sodium hydroxide(naoh). why does the ph of the solution remain below 7? ( explain so i can get better understanding! )

What prefix multiplier is appropriate for reporting a measurement of 5.57 ×10−5 m?