Question 4 (1 point) \begin{tabular}{|l|}\hline Which usten \\ Which of the following is an amphiprotic substance? \\ H3PO4 \\ PO43- \\ HPO42- \end{tabular}

(a) Write the systematic names for the following (i) \( \mathrm{CH}_{3} \mathrm{CH}\left(\mathrm{CH}_{3}\right)-\mathrm{CH}_{2}\left(\mathrm{CH}_{3}\right) \mathrm{CH}_{2} \mathrm{CH}_{3} \) (ii) \( \mathrm{CH}_{3} \mathrm{CH}\left(\mathrm{C}_{2} \mathrm{H}_{5}\right) \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{Cl} \) (iii) \( \mathrm{CH}_{3} \mathrm{C}\left(\mathrm{CH}_{3}\right)=\mathrm{CH}_{2} \) (iv) \( \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{C} \equiv \mathrm{CCH}_{2} \mathrm{CH}_{3} \) (v) \( \mathrm{CHBr}_{3} \)

\( \mathrm{X}_{2}\left(\mathrm{SO}_{4}\right)_{3} \) Weak base 1- Mention two different methods to dissolve the ppt. (A). 2- Find the mass of ppt. (A) + solution (B) which is produced from 26 g of \( \left.\mathrm{X}_{2}\left(\mathrm{NO}_{3}\right)_{2}\right)_{2} \).

6. How does the ground state electron configuration of the hydrogen atom differ from that of a ground state helium atom? a. Hydrogen has one electron in a higher energy level. b. Hydrogen has two electrons in a lower energy level. \( \begin{array}{l}\text { c. Hydrogen contains a half-filled orbital. } \\ \text { d. Hydrogen contains a completely filled orbital. }\end{array} \) \( \begin{array}{l}\text { 7. Which electron configuration represents an atom in an excited state? } \\ \begin{array}{ll}\text { a. } 1 s^{2} 2 s^{2} 2 p^{6} & \text { c. } 1 s^{2} 2 s^{2} 2 p^{5} \\ \text { b. } 1 s^{2} 2 s^{2} 2 p^{5} 3 s^{1} & \text { d. } 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{1}\end{array} \\ \begin{array}{ll}\text { 8. Which of the following represents an impossible electron configuration? } \\ \begin{array}{ll}\text { a. } 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{5} & \text { c. } 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{3} 3 p^{6} 4 s^{2} 3 d^{2}\end{array} \\ \text { b. } 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{1} & \text { d. } 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6}\end{array}\end{array} \).

b) Write structural formulae for the following compounds (i) \( 2,3,3,4 \) - tetra methyl pent - 1 - ene (ii) Tetralodo methane (iii) 2,5, di methyl hexane (iv) Heptane (v) Pent- 2 - yne

(a) Write the systematic names for the following: (i) \( \mathrm{CH}_{3} \mathrm{CH}\left(\mathrm{CH}_{3}\right)-\mathrm{CH}_{2}\left(\mathrm{CH}_{3}\right) \mathrm{CH}_{2} \mathrm{CH}_{3} \) (ii) \( \mathrm{CH}_{3} \mathrm{CH}\left(\mathrm{C}_{2} \mathrm{H}_{5}\right) \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{Cl} \) (iii) \( \mathrm{CH}_{3} \mathrm{C}\left(\mathrm{CH}_{3}\right)=\mathrm{CH}_{2} \) (iv) \( \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{C}=\mathrm{CCH}_{2} \mathrm{CH}_{3} \) (v) \( \mathrm{CHBr}_{3} \)