Matter and gas laws

Calculate the final temperature of a gas enclosed in a volume of 2 L at 1 atm, if we reduce its volume to 0.5 L and its pressure increases to 3.8 atm.

Determine the diffusion rate of hydrogen, knowing that the diffusion rate of oxygen is 2 minutes.

Is ethyl alcohol an element, a compound, or a mixture?

Determine the density of a sphere with a diameter of 6 cm, given that its mass is 250 g.

A 15 mL sample of a solid is weighed, and the recorded mass is 29 g. What is the density of the solid?

The volume of 200 g of a substance is 10 L. What is its density?

Decide if these sentences are true or false and rewrite the false sentences correctly. Be careful because each mistake discounts a right answer:
a) The density of a solution is equal to the mass of the solute divided by the volume of the solvent.
b) The interaction between unlike charges is a repulsion force.
c) Distillation is the method to separate miscible liquids.
d) Decantation is the correct method to separate a mix of alcohol and water.

Calculate the final volume of a gas at and 1.1 atm, when its volume is 3 L and the temperature and pressure are increased to and 1.3 atm.

Define, with your own words, the following concepts:
a) Pressure
b) Heat
c) Molecular Kinetic Theory for gases.