4 Multiple Choice CHEM QUESTIONS!?
#1. Which of the following does not follow the kinetic molecular theory?
A-Gas molecules have negligible volume.
B-Gas molecules do not have mass.
C-The average kinetic energy of gas molecules is proportional to the temperature of the gas molecules.
D-Gas molecules possess no attraction or repulsion to one another.
#2. If the Kelvin temperature of a substance has doubled, we can say:
A- the kinetic energy of the substance has been halved
B- the kinetic energy of the substance is tripled
C- the kinetic energy of the substance has doubled
D- the kinetic energy of the substance is unaffected
#3. The average kinetic energy of 1 mole of a gas at 0 Kelvin is:
A- 1.237 x 101 J
B- 5.543 x 100 J
C- 0 J
D- 8.314 x 100 J
#4. The average kinetic energy of 1 mole of a gas at standard temperature is:
A- 0 J
B- 3.40 x 103 J
C- 1.51 x 103 J
D- 3.36 x 101 J
- pisgahchemistLv 71 month agoFavorite Answer
Kinetic molecular theory.
1. The KMT does not say that molecules have no mass.
2. Doubling absolute T doubles the KE..... KE = 3/2RT
3. 0K cannot be reached. As T approaches 0K, KE approaches 0
4. KE = 3/2 (8.314 J/molK) x 273.15K = 3406 J/mol
The average kinetic energy can be expressed in two ways:
.... KE = 3/2RT
.... KE = ½mv² ............ KE = ½Mu² ..... where u is the RMS speed
Which gives rise to ....
3/2 RT = 1/2 mv²
3RT = Mu²
u = √(3RT/M) ........... speed of the molecules is directly proportional to the absolute temperature and inversely proportional to the molar mass
At absolute zero molecular motion reaches a minimum, not zero (it's a quantum theory thing). Absolute zero cannot be reached, only approached. As absolute zero is approached, matter can become an exotic condensed state.
- oeman50Lv 71 month ago
#1. B. Kinetic theory does not have mass as a factor.
#2 C. Kinetic energy is directly proportional to temperature.
#3 C. All molecular motion stops at 0K.