1. Dissolving ionic compounds in water

A. Maximizes the polar interactions between the ions and the water molecules

B. Minimizes the Coulombic attractions between the cations and the anions

C. Surrounds all cations with the partial negative charges of the water molecules

D. All of the above

E. None of the above

2. List the following compounds in order least soluble to most soluble

A. CaS < K₂S < KCl

B. KCl < K₂S < CaS

C. KCl < CaS < K₂S

D. K₂S < KCl < CaS

E. CaS < KCl < K₂S

3. Which orbital below has two planar nodes?

A. 2p

B. 1s

C. 2s

D. 4d

E. 4f

4. How many grams of ammonium sulfate are required to prepare 242.6 mL of a 0.583 M ammonium sulfate solution?

A. 18.69 g

B. 9.745 g

C. 0.00504 g

D. 6.03 g

E. 22.35 g

5. Assign oxidation numbers to each atom in indium nitrite, In(NO₂)₃

A. In = +3; N = -1; O = -2

B. In = +3; N = +1; O = -2

C. In = +3; N = +3; O = -2

D. In = 0; N = 0; O = 0

E. In = +2; N = -1; O = -2

6. Which equation best represents the net ionic equation for the reaction that occurs when aqueous solutions of potassium phosphate and copper (II) nitrate are mixed?

A. 2Cu²⁺ (aq) + 3PO₄^3-(aq) –> Cu₂(PO₄)₃ (s)

B. 3Cu²⁺ (aq) + 2PO₄^3- (aq) –> Cu₂(PO₄)₃ (s)

C. 6K⁺ + 2PO₄^3- (aq) + 3Cu²⁺+ 2NO_3-(aq) _–>Cu₃(PO₄)₂ (s) + 6K⁺ + 2NO₃ (aq)

D. 2K₃PO₄ (aq) + 3Cu²⁺(aq) –> Cu₃(PO₄)₂ (s) + 6K⁺(aq)

E. 2K⁺ (aq) + Cu(NO₃)₂(aq) –> 2KNO₃ (aq) + Cu²⁺(aq)

7. Which of the following statement(s) about exothermic and endothermic reactions is/are true?

A. In endothermic reactions, weaker bonds are broken and stronger bonds are formed

B. In exothermic reaction, energy is a product

C. In exothermic reactions, strong bonds are broken and weaker bonds are formed

D. In endothermic reactions, energy is a product

E. All of the abov

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