0.50 g of magnesium is placed in a foam cup calorimeter containing 100. mL of 1 M HCl at 25.0ºC. The solution reaches a temperature of 47.6ºC. How many joules of heat were released by the reaction of
magnesium with HCl?

For calculations, ignore the mass of the magnesium. Assume that HCl is primarily
water and has the same specific heat as water and has a density of 1.00 g/mL.

What layer of the atmosphere is directly above the troposphere?

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

Identify one disadvantage to each of the following models of electron configuration: -dot structures -arrow and line diagrams -written electron configurations type in your answer below. (answer) -dot structures do not show the distribution of electrons in orbitals and take up a lot of space. -arrow and line diagrams take up a lot of space and make it difficult to count electrons. -written configurations make it easy to lose count of electrons and do not show the distribution of electrons in orbitals.