Asolution contains one or more of the following ions: ag+, ca2+, and cu2+. when sodium chloride is added to the solution, no precipitate forms. when sodium sulfate is added to the solution, a white precipitate forms. the precipitate is filtered off and sodium carbonate is added to the remaining solution, producing a precipitate. write net ionic equations for the formation of each of the precipitates observed.

Cl⁻ + Ag⁺ → ClAg ↓

CO₃⁻² + Ca²⁺  →  CaCO₃ ↓

CO₃⁻² + Cu²⁺  →  CuCO₃ ↓

Explanation:

The cations in solution are Ag⁺, Ca²⁺, and Cu²⁺

When sodium chloride is added to the solution, no precipitate forms.

FALSE

NaCl → Na⁺ + Cl⁻

Cl⁻ + Ag⁺ → ClAg ↓

When sodium sulfate is added to the solution, a white precipitate forms.

FALSE - No precipitate formed

The precipitate is filtered off and sodium carbonate is added to the remaining solution, producing a precipitate.

When you filtered off the precipitate (we mean AgCl), in solution there's still remain Ca²⁺ and Cu²⁺

Na₂CO₃ → 2Na⁺  +  CO₃⁻²

CO₃⁻² + Ca²⁺  →  CaCO₃ ↓

CO₃⁻² + Cu²⁺  →  CuCO₃ ↓

answer by yourhope:

how do models compare to real-world objects?

d. most models represent a real-world object in a simpler way.

: )

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.