3. You are given a compound with the formula MCl2, in which M is a metal. You are told that the metal ion has 26 electrons. What is the identity of the metal?
(A) Fe
(B) Al
(C) Zn
(D) Co
(E) Ni

4. All of the following are in aqueous solution. Which is incorrectly named? (A) HC2H3O2, acetic acid (B) HBr, bromic acid (C) H2SO3, sulfurous acid (D) HNO2, nitrous acid (E) HClO3, chloric acid

5. A substance, A3B, has the composition by mass of 60% A and 40% B. What is the composition of AB3 by mass? (A) 40% A, 60% B (B) 50% A, 50% B (C) 14% A, 86% B (D) 25% A, 75% B (E) none of these

6. A 2.80-g sample of an oxide of bromine is converted to 4.698 g of AgBr. Calculate the empirical formula of the oxide. (molar mass for AgBr = 187.78 g/mol) (A) BrO3 (B) BrO2 (C) BrO (D) Br2O (E) none of these

7.For the reaction \( 4\text{FeCl}_2(aq) + 3\text{O}_2(g) \rightarrow 2\text{Fe}_2\text{O}_3(s) + 4\text{Cl}_2(g) \), what volume of a \( 0.760\ M \) solution of \( \text{FeCl}_2 \) is required to react completely with \( 6.36 \times 10^{21} \) molecules of \( \text{O}_2 \)? (A) \( 5.26 \times 10^3\text{mL} \) (B) \( 10.7\text{ mL} \) (C) \( 10.4\text{ mL} \) (D) \( 18.5\text{ mL} \) (E) \( 6.02\text{ mL} \)

8. Four identical 1.0-L flasks contain the gases He, Cl2, CH4, and NH3, each at 0°C and 1 atm pressure. Which gas has the highest density? (A) He (B) Cl2 (C) CH4 (D) NH3 (E) all gases the same

9. Order the following in increasing rate of effusion: F₂, Cl₂, NO, NO₂, CH₄ (A) Cl₂ < NO₂ < F₂ < NO < CH₄ (B) Cl₂ < F₂ < NO₂ < CH₄ < NO (C) CH₄ < NO₂ < NO < F₂ < Cl₂ (D) CH₄ < NO < F₂ < NO₂ < Cl₂ (E) F₂ < NO < Cl₂ < NO₂ < CH₄

10. Consider the following specific heats of metals. The Specific Heat (J/(g°C)) for Zinc, Magnesium, Iron, Silver, and Lead are 0.387, 1.02, 0.450, 0.237, 0.127, respectively. If the same amount of heat is added to 25.0 g of each of the metals, which are all at the same initial temperature, which metal will have the highest temperature? (A) Zinc (B) Magnesium (C) Iron (D) Silver (E) Lead

11. Consider the following processes: | Processes | 3B → 2C + D | (1/2)A → B | E + A → D | | --- | --- | --- | --- | | ΔH (kJ/mol) | -125 | 150 | 350 | Calculate ΔH for: B → E + 2C (A) 325 kJ/mol (B) 525 kJ/mol (C) -175 kJ/mol (D) -325 kJ/mol (E) none of these

12. What is the wavelength of light that is emitted when an excited electron in the hydrogen atom falls from n = 5 to n = 1? (h = 6.626×10⁻³⁴ J·s) (A) 1.05 × 10⁷ m (B) 9.50 × 10⁻⁸ m (C) 2.09 × 10⁻¹⁸ m (D) 9.12 × 10⁻⁸ m (E) none of these

13. Consider the following orderings. I. Na⁺ < Mg²⁺ < Al³⁺ < Si⁴⁺ II. Be < Mg < Ca < Sr III. I < Br < Cl < F IV. Al < Si < P < Cl Which of these give(s) a correct trend in ionization energy? (A) III (B) II, IV (C) I, IV (D) I, III, IV (E) none of them

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