Indicate whether the following change in the physical state require heating or cooling.

Liquid to gas

State the term that applies to each of the following changes of physical state:

(a) A refrigerant changes from a gas to a liquid.

(b) Water changes from a liquid to a solid.

(c) Iodine vapor changes from a gas to a solid.

A steel cylinder containing air is heated from $25^{\circ} \mathrm{C}$ to $50^{\circ} \mathrm{C}$. State the change in each of the following:

(a) kinetic energy of the gas

(b) motion of air molecules

Write the chemical formula for vitamin $B_6$, which is composed of 8 carbon atoms, 11 hydrogen atoms, 1 nitrogen atom, and 3 oxygen atoms.

A sample of fluorine gas occupies 855 mL at 710 mm Hg and 155 degree celcius. What is the mass of the sample?

What volume (in liters) is occupied by 3.38 X 10$^{22}$ nitrogen molecules at 100 degree celsius and 255 mm Hg?

If 1.25 mol of helium gas occupies 5.00 L at 2.25 atm, what is the temperature in degrees Celsius?

How many moles of helium gas occupy 5.00 L at 373 K and 1.75 atm?

How many moles of helium gas occupy 10.0 L at 100 K and 3.50 atm?

A sample of ammonia gas has a volume of 50.0 mL at STP. What is the Celsius temperature if the volume is 350.0 mL at 350 mm Hg?

A 100.0-mL sample of air is collected at 21 degree celsius and 772 mm Hg. What is the volume of air at STP?

A 25.0-mL sample of neon gas at 455 mm Hg is cooled from 100$\degree$C to 10$\degree$C. If the volume remains constant, what is the final pressure?

A 2.50 L sample of nitric oxide gas at 100$\degree$C is cooled to 20$\degree$C. If the pressure remains constant, what is the final volume?

A sample of air at 15.0 psi compresses from 555 mL to 275 mL. If the temperature remains constant, what is the final pressure in psi?