You are investigating physical properties in chemistry. Your teacher gives each group of salt water solution and challenges each group to make changes that only affect the physical properties of the solution. Which one of these changes would NOT indicate
your understanding of physical changes?
A)
adding more salt to the solution
Eliminate
B)
changing the density of the solution
watching an iron nail rust in salt water
D)
changing the conductivity of the solution

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

The number of neutrons is equal to the atomic number minus the atomic mass. a. true b. false

How many moles of cu are needed to react with 5.8 moles of agno3? cu + 2 agno3 → cu(no3)2 + 2 ag