The picture below shows an experiment in which a student mixed two clear liquids together. The student can conclude that a chemical change occurred because —
A. О a solid formed when the two liquids were mixed.
В.
there was no temperature change during the experiment.
С.
there was no change in mass during the experiment.
D
one substance was more dense than the other.

Which one of the following gases is not an important component of soil?

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

Why did southern business leaders want to increase the number of slaves