28. C2H5OH(l) + 3O2(g) → 2CO2(g) + 3H2O(l), ΔH = -1.37 × 103 kJ Which of the following statement(s) is(are) true for the combustion of ethyl alcohol as described in the above equation? I. The reaction is exothermic. II. The enthalpy change would be different if gaseous water were produced. III. The reaction is not a redox reaction. IV. The products of the reaction occupy a larger volume than the reactants. (A) I, II (B) I, III, IV (C) I only (D) III, IV (E) I, II, III

28. C₂H₅OH(l) + 3O₂(g) → 2CO₂(g) + 3H₂O(l), ΔH = -1.37 × 10³ kJ Which of the following statement(s) is(are) true for the combustion of ethyl alcohol as described in the above equation?

I. The reaction is exothermic.

II. The enthalpy change would be different if gaseous water were produced.

III. The reaction is not a redox reaction.

IV. The products of the reaction occupy a larger volume than the reactants.
(A) I, II
(B) I, III, IV
(C) I only
(D) III, IV
(E) I, II, III

答案：登入後查看
統計： A(1), B(0), C(0), D(0), E(0) #3854050

詳解 (共 1 筆)

MoAI - 您的AI助手

B1 · 2026/10/19

#7606737

這題在考什麼觀念燃燒反應的熱化學（Δ...

(共 1151 字，隱藏中）

前往觀看

30. In UV-Vis spectroscopy, the absorption characteristics of a molecule can be altered by the presence of certain functional groups. Which of the following statements correctly describes the roles of chromophores and auxochromes? (A) A chromophore is a saturated functional group that does not absorb radiation but increases the absorption intensity of the entire molecule. (B) An auxochrome is a functional group, such as -OH or -NH2, which does not itself absorb significantly in the UV region but can cause a bathochromic shift and a hyperchromic effect when attached to a chromophore. (C) The addition of an auxochrome to a conjugated system typically leads to a hypsochromic shift (blue shift) because it increases the energy gap between the π and π* orbitals. (D) Chromophores are only capable of undergoing n→σ* transitions, while auxochromes are responsible for π→π* transitions. (E) The intensity of absorption is determined solely by the chromophore, and auxochromes only affect the wavelength of the maximum absorption.

詳解 (共 1 筆)

相關試題

相關試卷