Which of the following correctly describes what happens to the kinetic energy of water when it changes from the solid state to the liquid state?

the kinetic energy of the molecules decreases.
the kinetic energy of the molecules increases then decreases.
the kinetic energy of the molecules increases.
there is no change in the kinetic energy of the molecules.

Which phrase best describes the rock's texture? 1.jagged grains 2.coarse grains 3.rounded grains 4.non-banded grains

There are main groups in the modern periodic table of elements

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