1) Of the following three scienæst]physics, chemistry, and biologyüthe most complex is A) physics, because it involves many mathemati. cal equations. B) chemistry, because there are so .many possible combinations of C) biology, because it is based upon both the laws of chemistry and physics. D) All three of these sciences are equally complex.

How many moles of magnesium is 3.01 x10^22 atoms of magnesium?

1)each group 16 element has how many valence electrons? ( )4 ( )6 ( )8 ( )16 2)how many dots appear in the dot structure for calcium ion, ca2+? ( )zero ( )one ( )two ( )eight 3) which of the following atoms forms a cation to obtain an octet of outer shell electrons? ( )magnesium ( )oxygen ( )fluorine ( )helium 4) an al3+ ion contains 13 protons and 10 electrons. ( )true ( )false 5) valence and non-valence electrons are represented in lewis dot structures. ( )true ( )false

An animal cell loses the ability to convert energy stored in food to energy that the cell can use. which of the cell's organelles has stopped working? a.the mitochondria b.the nucleus c.the vacuoles d.the endoplasmic reticulum