A 25.00 L tank is filled with 0.0300 kg of Ar and 10.05 g of Ne. The two gases mix in the container but do not react to form any compounds (i. e. they do not combine chemically).

(a) Find the total number of atoms in the container.

(b) Find the density of the gas mixture. Express your answer in terms of ng/umº. Please
remember to show all of your work with the appropriate units.

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

Which class of molecules functions as chemical signals? hormones water carbohydrates proteins

Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)