15. 一條截面積為圓型的長直導線，其長度幾近無窮長、横截面的半徑為?，如下圖。有電流?均勻 分佈其中。和横截面中心的距離r，其磁場大小為B(r)。問：B(r< R) =？
(A)
(B)
(C)
(D)

1. An unknown substance dissolves readily in water but not in benzene (a nonpolar solvent). Molecules of what type are present in the substance? (A) neither polar nor nonpolar (B) polar (C) either polar or nonpolar (D) nonpolar (E) none of these

2. Which of the following is a strong acid? (A) HF (B) KOH (C) HClO4 (D) HClO (E) HBrO

3. In the reaction C(s) + O2(g) → CO2(g) carbon is __________. (A) the reducing agent (B) the electron acceptor (C) reduced (D) the oxidizing agent (E) more than one of these

4. Which gas has the highest density? (A) He (B) Cl2 (C) CH4 (D) NH3 (E) all gases the same

5. If M is the molar mass, R the gas constant, T the temperature, and P its pressure, which of the following expressions represents the density of a gas? (A)\( \frac{PM}{RT} \) (B)\( \frac{RM}{PT} \) (C)\( \frac{RMP}{T} \) (D)\( \frac{RTM}{p} \) (E)\(\frac{RT}{PM} \)

6. A gas absorbs 0.0 J of heat and then performs 15.8 J of work. The change in internal energy of the gas is (A) 31.6 J (B) 15.8 J (C) –31.6 J (D) –15.8 J (E) none of these

7. Calculate the work associated with the expansion of a gas from 42.0 L to 79.0 L at a constant pressure of 14.0 atm. (A) 518 L·atm (B) –518 L·atm (C) –1.11 × 103 L·atm (D) 588 L·atm (E) 1.11 × 103 L·atm

8. What is the specific heat capacity of a metal if it requires 169.6 J to change the temperature of 15.0 g of the metal from 25.00°C to 32.00°C? (A) 0.619 J/g°C (B) 11.3 J/g°C (C) 24.2 J/g°C (D) 1.62 J/g°C (E) 275 J/g°C

9. Choose the correct equation for the standard enthalpy of formation of CO(g), where ΔHf° for CO = –110.5 kJ/mol (gr indicates graphite).  (A) 2C(gr) + O2(g) → 2CO(g), ΔH° = –110.5 kJ (B) C(gr) + O(g) → CO(g), ΔH° = –110.5 kJ (C) C(gr) + O2(g) → CO(g), ΔH° = –110.5 kJ (D) C(gr) + CO2(g) → 2CO(g), ΔH° = –110.5 kJ (E) CO(g) → C(gr) + O(g), ΔH° = –110.5 kJ

10. Which of the following statements best describes the Heisenberg uncertainty principle? (A) The exact position of an electron is always uncertain. (B) The velocity of a particle can only be estimated. (C) It is impossible to accurately know both the exact location and momentum of a particle. (D) The location and momentum of a macroscopic object are not known with certainty. (E) The location and momentum of a particle can be determined accurately, but not the identity of the particle.

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