18. Calculate the pH of a solution prepared by mixing 50 mL of a 0.10 M solution of HF with 25 mL of a 0.20 M solution of NaF. \(pK_a\) of HF is 3.14.
(A)3.14
(B)10.80
(C)5.83
(D)7.35
(E)12.00

1. The element rhenium (Re) exists as two stable isotopes and 18 unstable isotopes. Rhenium-185 has in its nucleus. (A)75 protons, 75 neutrons. (B)75 protons, 130 neutrons. (C)130 protons, 75 neutrons. (D)75 protons, 110 neutrons. (E)not enough information is given.

2. What is the correct formula for iron(II) sulfate? (A)Fe2SO4 (B)FeSO4 (C)Fe(SO4)2 (D)FeSO3 (E)Fe2SO3

3. Which of the following formulas is not the correct? (A)Al(OH)3 (B)MgCl2 (C)K2CrO4 (D)(NH4)2PO4 (E)Li2CO3

4. Consider the element indium, atomic number 49, atomic mass 114.8 g. The nucleus of an atom of indium-112 contains (A)49 protons, 63 neutrons, 49 electrons. (B)49 protons, 49 neutrons. (C)49 protons, 49 alpha particles. (D)49 protons, 63 neutrons. (E)49 protons, 112 neutrons.

5. A metal M forms an oxide M2O3, containing 68.4% metal by mass. Calculate the atomic mass of the metal. (A)51.9 g/mol (B)68.4 g/mol (C)106 g/mol (D)23.9 g/mol (E)45.6 g/mol

6. What mass of styrene (molar mass 104.1 g/mol) contains \(4.50 \times 10^{20}\) molecules of styrene? (A)\(7.48 \times 10^{-4}\) g (B)\(7.48 \times 10^{-3}\) g (C)\(7.78 \times 10^{-2}\) g (D)0.00778 g (E)\(7.48 \times 10^4\) g

7. Which of the following solutions contains the greatest total ion concentration? (A)One mole of potassium chloride dissolved in 1.0 L of solution. (B)One mole of iron(II) nitrate dissolved in 1.0 L of solution. (C)One mole of potassium hydroxide dissolved in 1.0 L of solution. (D)One mole of sodium phosphate dissolved in 1.0 L of solution. (E)At least two of the above solutions have an equal number of ions, and these contain the greatest total ion concentration.

8. You have 100.0 mL of a 0.2500M solution of NaCl sitting in a beaker. After several days you test the solution and find that it has a concentration of 0.3125 M. How much water must have evaporated? (A)10.0 mL (B)20.0 mL (C)80.0 mL (D)90.0 mL (E)The concentration will not change due to evaporation.

9. In the reaction Cu (s) + AgNO3 (aq) \(\rightarrow\) Cu(NO3)2 (aq) + Ag (s), identify the oxidizing agent. (A)Cu (B)AgNO3 (C)Cu(NO3)2 (D)Ag (E)none of these

10. The volume of a balloon is 1.20 liters at 24.0°C. The balloon is heated to 48.0°C. Calculate the new volume of the balloon. (A)1.20 L (B)1.30 L (C)1.70 L (D)2.10 L (E)2.40 L

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