Question

14 multiple choice 1 point what happens to particles in matter when thermal energy is absorbed? the average speed of the particles increases. strong attractions are formed between particles. the particles get larger. the particles move closer together. 15 formula 1 point if 8.2 liters of helium at 24.1 °c is allowed to expand to 13.5 liters, what must the new temperature, in k, be to maintain constant pressure? round to 1 decimal place answer

Explanation:

Step1: Convert initial temperature to Kelvin

$T_1 = 24.1+273.15=297.25\ K$

Step2: Apply Charles's Law ($\frac{V_1}{T_1}=\frac{V_2}{T_2}$)

$\frac{8.2}{297.25}=\frac{13.5}{T_2}$

Step3: Solve for $T_2$

$T_2=\frac{13.5\times297.25}{8.2}$
$T_2=\frac{4012.875}{8.2}\approx489.4\ K$

When matter absorbs thermal energy, the kinetic energy of its particles increases. Kinetic energy is related to the speed of particles, so the average speed of the particles increases.

Answer:

489.4