24. What is the electron configuration of the Sc(I) ion?
(A)[Ar] 4s¹4d¹
(B)[Ar] 3d²
(C)[Ar] 3d¹3a¹
(D)[Ar] 4s²

25. Which is a possible product of the chlorination of butane in the presence of light? (A)C4H9Cl (B)C4H7Cl (C)C4H10Cl2 (D)C4H6Cl2

1. When the following equation is balanced, what is the coefficient for H₂O? $$\text{Ca(OH)}_2(aq) + \text{H}_3\text{PO}_4(aq) \rightarrow \text{Ca}_3(\text{PO}_4)_2(s) + \text{H}_2\text{O}(l)$$ (A)2 (B)3 (C)4 (D)6

2. A substance that, when dissolved in water, produces a solution that conducts electric current very efficiently is called (A) a strong electrolyte (B) a weak electrolyte (C) a strong ion (D) an electrical solute

3. Classify the reaction : $$\text{Cu(NO}_3)_2(aq) + 2\text{NaOH}(aq) \rightarrow \text{Cu(OH)}_2(s) + 2\text{NaNO}_3(aq)$$ (A) formation of a solid (B) formation of a gas (C) formation of water (D) transfer of electrons

4. The equation 2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O is an oxidation-reduction reaction. Which statement is true? (A) the carbon is reduced, and the oxygen is oxidized (B) the carbon is oxidized, and the hydrogen is reduced (C) the carbon is oxidized, and the oxygen is reduced (D) it is a decomposition reaction

5. $$\text{Cu(NO}_3)_2(aq) + 2\text{NaOH}(aq) \rightarrow \text{Cu(OH)}_2(s) + 2\text{NaNO}_3(aq)$$ Which one is the net ionic equation? (A) $$\text{Cu}_2^+(aq) + 2\text{NO}_3^-(aq) \rightarrow \text{Cu(NO}_3)_2(aq)$$ (B) $$\text{Cu}_2^+(aq) + 2\text{OH}^-(aq) \rightarrow \text{Cu(OH)}_2(s)$$ (C) $$2\text{NO}_3^-(aq) + 2\text{Na}^+(aq) \rightarrow 2\text{NaNO}_3(aq)$$ (D) $$\text{Na}^+(aq) + \text{OH}^-(aq) \rightarrow \text{NaOH}(s)$$

6. How many electrons are transferred in the following redox reaction? $$\text{Zn}(s) + 2\text{AgNO}_3(aq) \rightarrow \text{Zn(NO}_3)_2(aq) + 2\text{Ag}(s)$$ (A)1 (B)2 (C)3 (D)4

7. Finish and balance the neutralization reaction: $$\text{HClO}_4(aq) + \text{Ba(OH)}_2(aq) \rightarrow$$ (A) $$\text{H}_2\text{O}(l) + \text{BaCl}_2(aq)$$ (B) $$\text{H}_2\text{O}(l) + \text{Ba(ClO}_4)_2(s)$$ (C) $$\text{H}_2\text{O}(l) + \text{Ba(ClO}_4)_2(aq)$$ (D) $$\text{BaO}(s) + \text{Cl}_2(g) + \text{H}_2\text{O}(l)$$

8. $$\text{Al}(s) + \text{I}_2(g) \rightarrow \text{AlI}_3(s)$$. Which one is correct? (A) $$\text{I}_2$$ is oxidized (B) Al is reduced (C) Al is a reducing agent (D) $$\text{I}_2$$ is a reducing agent

9. Calculate the molar mass of a sample with a single molecule weighs $$9.31 \times 10^{-23}$$ g. (A) 56.1 g/mol (B) $$6.47 \times 10^{41}$$ g/mol (C) $$6.02 \times 10^{23}$$ g/mol (D) $$9.31 \times 10^{-23}$$ g/mol

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