39.下列與強制對流熱傳     無關     的無因次群是何者？
(A) 雷諾數 Re ( Reynolds number )
(B) 奈塞數 Nu ( Nusselt number )
(C) 普蘭特數 Pr ( Prandtl number )
(D) 葛拉修夫數 Gr ( Grashof number )

40.已知有一物體在 500 ℃ 時之輻射強度為 100 kW/m2 ，試推算此物體在 1000 ℃時之輻射 強度為多少 kW/m2 ？ (A) 200 (B) 400 (C) 736 (D) 1600

1. When the following equation is balanced, what is the coefficient for H2O? Ca(OH)2(aq) + H3PO4(aq) → Ca3(PO4)2(s) + H2O(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 : \[ \text{Cu(NO}_3)_2\text{(}\textit{aq}\text{)} + 2\text{NaOH(}\textit{aq}\text{)} \rightarrow \text{Cu(OH)}_2\text{(s)} + 2\text{NaNO}_3\text{(}\textit{aq}\text{)} \] (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. \( \text{Cu(NO}_3)_2\text{(aq)} + 2\text{NaOH(aq)} \rightarrow \text{Cu(OH)}_2\text{(s)} + 2\text{NaNO}_3\text{(aq)} \)Which one is the net ionic equation?(A) \( \text{Cu}^{2+}\text{(aq)} + 2\text{NO}_3^-\text{(aq)} \rightarrow \text{Cu(NO}_3)_2\text{(aq)} \)(B) \( \text{Cu}^{2+}\text{(aq)} + 2\text{OH}^-\text{(aq)} \rightarrow \text{Cu(OH)}_2\text{(s)} \)(C) \( 2\text{NO}_3^-\text{(aq)} + 2\text{Na}^+\text{(aq)} \rightarrow 2\text{NaNO}_3\text{(aq)} \)(D) \( \text{Na}^+\text{(aq)} + \text{OH}^-\text{(aq)} \rightarrow \text{NaOH(s)} \)

6. How many electrons are transferred in the following redox reaction?  Zn(s) + 2AgNO3(aq) → Zn(NO3)2(aq) + 2Ag(s) (A)1 (B)2 (C)3 (D)4

7. Finish and balance the neutralization reaction: HClO4 (aq) + Ba(OH)2 (aq) → (A) H2O (l) + BaCl2 (aq) (B) H2O (l) + Ba(ClO4)2 (s) (C) H2O (l) + Ba(ClO4)2 (aq) (D) BaO (s) + Cl2 (g) + H2O (l)

8. Al(s) + I2(g) → AlI3(s). Which one is correct? (A) I2 is oxidized (B) Al is reduced (C) Al is a reducing agent (D) I2 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) \(6.47 \times 10^{45}\) g/mol(C) \(6.02 \times 10^{23}\) g/mol(D) \(9.31 \times 10^{-23}\) g/mol

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