James has three cubes with identical dimensions. He places the blocks in water, as shown below.

What can James accurately predict? A Blocks B and C have the same mass. B Block A has greater mass than block B. C Block B has greater mass than block C. D Block C has greater mass than block A.

The pressure inside a hydrogen-filled container was 2.10 atm at 21 ? c. what would the pressure be if the container was heated to 92 ? c ?

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

How many grams of oxygen gas are contained in a 15 l sample at 1.02 atm and 28°c? show your work.