2. Which process is endothermic? A) Water condenses on the outside of a cold sod

Question

2. Which process is endothermic? A) Water condenses on the outside of a cold soda can. B) The melted wax hardens after a candle is extinguished. C) Water vapor forms ice crystals in the upper atmosphere. D) Gasoline spilled on the ground evaporates very quickly E) none of the above 3. Which molecule will undergo only London dispersion forces when interacting with other molecules of the same kind? A) HF B) CH2CI2 C) C4H10 D) NaC2H302 E) C2HSOH 4. Which of the assumptions of the kinetic-molecular theory best explains the observation that a balloon collapses when exposed to liquid nitrogen (which is much colder than a cold winter day!!)? A) Gas molecules move at random with no attractive forces between them B) The velocity of gas molecules is proportional to their Kelvin temperature. C) The amount of space occupied by a gas is much greater than the space occupied by the actual gas molecules. D) In collisions with the walls of the container or with other molecules, energy is conserved E) Collisions with the walls of the container or with other molecules are elastic. 5. A 65 mL sample of argon gas has a temperature of 325 C. What will the temperature be in °C when the volume of the gas is decreased to 25 mL at constant pressure? A) 65 B) 125 C)-43°C D) 1280°C E)641

Explanation / Answer

2)

A) gas to liquid change is exothermic

B) liquid to solid change is exothermic

C) liquid to solid change is exothermic

D) liquid to gas change in endothermic

Answer: D

3)

HF is polar due to presence of

CH3Cl2 is polar due to presence of Cl

NaC2H3O2 is ionic

C2H5OH is polar due to presence of O

C4H10 is non polar because it has all C and H

So, Only London force will be present here

Answer: c

Only 1 question at a time please

Related Questions

Navigate

• Browse (All)
• Browse 2
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.