5. Which of the following compounds is a strong acid?
(A) HF
(B) HI
(C)HClO₂
(D) H₂SO₃
(E) HNO₂

1. How many significant figures does the difference 218.7201 – 218.61 contain? (A) 1 (B) 2 (C) 3 (D) 4 (E) 5

2. Which one of the following elements is most likely to form a 1+ ion? (A) aluminum (B) indium (C)thallium (D) boron (E) gallium

3. Name the compound CuSO4 (A) Copper (I) sulfate (B) Copper (II) sulfate (C)Copper (II) sulfite (D) Cobalt (II) sulfate (E) Cobalt (II) sulfite

4. A mass spectrometer works by ionizing atoms or molecules, and then accelerating them through oppositely charged plates. The mass is obtained by (A) measuring the force of impact on a detecting screen, and then calculating the mass using force = mass × acceleration. (B) suspending the ions in an applied electric field, and then calculating mass by the setting the downward gravitational force equal to the upward electrostatic force. (C)measuring the magnitude of deflection as the ions pass through a magnetic field to obtain the charge-to-volume ratio, and then calculating the mass from that ratio. (D) measuring the time it takes for the ions to hit the detector at a known distance to calculate the acceleration, and then calculating mass from force = mass × acceleration. (E) all are not correct.

6. How many total electrons are transferred in the following reaction? (A) 2 (B) 3 (C)4 (D) 6 (E) 12

7. A 45 mL sample of nitrogen gas is cooled from 135ºC to 15°C in a container that can contract or expand at constant pressure, what is the new volume of the nitrogen gas? (A) 64 mL (B) 5.0 mL (C)410 mL (D) 32 mL (E) 41 mL

8. Styrene, C8H8, is one of the substances used in the production of synthetic rubber. When styrene burns in oxygen to form carbon dioxide and liquid water under standard-state conditions at 25°C, 42.62 kJ are released per gram of styrene. Find the standard enthalpy (kJ/mol) of formation of styrene at 25°C. (Given: ) (A) ~141.28 (B) ~317.28 (C)~636.7 (D) ~4249 (E) ~8730

9. What is the maximum number of electrons in an atom that can have the following quantum numbers? n = 3 l = 2 (A) 18 (B) 10 (C)5 (D) 2 (E) 1

10. Which of the following make an isoelectronic pair: ? (A) (B) (C) (D) (E) None of the above.

11. The cobalt(III) complex, , has how many 3d electrons? (A) 0 (B) 7 (C)6 (D) 5 (E) 4