40 POINTS Part D
Scientists have done careful and repeated experiments to determine enthalpy changes for many different chemical
reactions. The accepted reaction enthalpies for the chemical reactions in tasks 1 through 3 are given in the table.
Compare your experimentally determined reaction enthalpies from these tasks with the accepted enthalpies. Are
your results similar to or different from the accepted values? What may have contributed to any differences?
Reaction
Accepted Reaction Enthalpy,
AH
CuSO4 + 5H20 = CuSO4.5H20
-78,000 J/mol
Zn + CuSO4 = Cu + ZnSO4
-217,000 J/mol
H3C6H507 + 3NaHCO3 = Na3C6H5O7 + 3CO2 + 3H20 480,000 J/mol
+
BI UX X, Font Sizes
A
5
1 E 3

assuming that your periodic table has eighteen columns, you should highlight   the four elements in the third column from the left of the table.

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the have energy higher than those in the orbital while lower than those of the orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the orbital is therefore filled right after orbitals and before orbitals.  

potassium has electron configuration and calcium . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the and should be highlighted as well.

frequency, z, and the collision density, z, in carbon dioxide (co2), r 180 pm at 30 °c and 120 kpa

a