1. The empirical formula of styrene is CH; its molar mass is 104.1 g/mol. What is the molecular formula of styrene?
(A) C₂H₄
(B) C₈H₈
(C) C₁₀H₁₂
(D) C₆H₆

3. The empirical formula of styrene is CH； its molar mass is 78.1. What is the molecular formula of styrene? (A) C6H6 (B) C8H8 (C) (D) (E)

2. What type of reaction always produce water? (A) Precipitation (B) Acid-Base (C) Decomposition (D) Synthesis

3. Which of the following statements about quantum theory is incorrect? (A) No two electrons can have the same four quantum numbers. (B) The energy and position of an electron cannot be determined simultaneously. (C) Lower energy orbitals are filled with electrons before higher energy orbitals. (D) When filling orbitals of equal energy, two electrons will occupy the same orbital before filling a new orbital. (E) All of these are correct.

4. Sodium losing an electron is an ________ process, and fluorine losing an electron is an _______ process. (A) exothermic, endothermic (B) endothermic, exothermic (C) exothermic, exothermic (D) endothermic, endothermic (E) More information is needed.

5. Which of the following compounds will NOT show the precipitation? (A) AgNO3 + HCl (B) Hg(NO3)2 + HCl (C) Pb(NO3)2 + Na2S (D) Hg(NO3)2 + Na2S

6. Which of the following atoms or ions has three unpaired electrons? (A) N (B) O (C) Al (D) S2 – (E) I3 –

7. If n = 3, how many orbitals are possible? (A) 3 (B) 4 (C) 8 (D) 9 (E) 6

8. Equilibrium is reached in chemical reactions when: (A) All chemical reactions stop. (B) The concentrations of reactants and products become equal. (C) The rates of the forward and reverse reactions become equal. (D) The temperature shows a sharp rise. (E) The forward reaction stops.

9. Which of the following bonds is least polar? (A) C—O (B) H—C (C) Cl—Cl (D) S—Cl (E) They are all nonpolar.

10. Which of the following is the empirical formula of glucose, C6H12O6? (A) C3H6O3 (B) C6H12O6 (C) CH4O (D) CH2O

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