A coffee cup calorimeter contains 100.0mL of 1.50 M Ba(NO3)2 at 25.0 degrees Celsius. A student pours 100.0mL of 1.50 M Na2SO4 at 25 degrees Celsius into the calorimeter. A precipitate forms and the temperature rises to 29.7 degrees Celsius. Assume that no heat was lost to the surroundings, the volumes were additive, the specific heat capacity of the solution was 4.184 j/gal and the density of the solution was 1.00 g/mL. A) this reaction could be represented as a complete ionic or a net ionic equation. Write the balanced chemical equation that should be used in association with the value for this reaction.
B) find the amount of the heat that was last or gained by the solution in the calorimeter.
C) find the heat of reaction
D) is the reaction endothermic or exothermic?

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.

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