Question 39 Answer and Explanation _ACT January 2009 Form 61F Science Section

39. Consider only the data for C₄H₁₀ and CH₃Cl. These data are inconsistent with which of the following hypotheses about thermal conductivity?

A. For C₄H₁₀, as the temperature increases, the thermal conductivity increases.

B. For CH₃Cl, as the temperature increases, the thermal conductivity increases.

C. At a given temperature, as molecular mass increases, the thermal conductivity increases only.

D. At a given temperature, as molecular mass increases, the thermal conductivity decreases only.

Answer and Explanation

Your Answer is

Correct Answer is D

Explanation

The molecular mass of C₄H₁₀ in the two substances is greater, but at the same temperature, its thermal conductivity is also greater, so option D is wrong