EjerciciosFyQ

General gas law (8316)

F_y_Q — 2024-09-17T02:52:07Z

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.

You will use the state equation of gases:

Solving for the value of :

Application of Graham's law: hydrogen diffusion rate (8308)

F_y_Q — 2024-09-12T04:06:10Z

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

Graham's law relates the diffusion rates of two gases to their molecular masses. If the gases are A and B, the relationship is:

For hydrogen and oxygen, both being diatomic, the molecular masses are:

The relationship between their diffusion rates will be:

This means hydrogen diffuses four times faster than oxygen, so the diffusion rate of hydrogen will be 0.5 minutes, or 30 seconds.

Is ethyl alcohol a mixture or a pure substance? (8287)

F_y_Q — 2024-08-13T03:54:10Z

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

Ethyl alcohol, or ethanol, falls under what we call "pure substances", so you should discard the idea that it is a mixture (except in the case mentioned at the end).

Within pure substances, you can find elements, which are made up of a single type of atom, and compounds, which are made up of more than one type of atom.

Ethyl alcohol is a compound (). As you can see, it contains carbon, hydrogen, and oxygen atoms.

However, if we refer to the alcohol that can be purchased in stores or pharmacies, we would be talking about a mixture because it is not pure alcohol; it contains water. This is why the label indicates that it is or , for example.

Calculation of the density of a sphere knowing its diameter (8285)

F_y_Q — 2024-08-12T14:03:58Z

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

To calculate the density of a system, you need to know its mass and volume. First, you must calculate the volume of the sphere using the volume equation:

Given that the diameter is provided, which is twice the radius, the radius of the sphere is 3 cm. Substitute and calculate:

Now you can calculate the density of the sphere by dividing the mass by the volume:

Density of a sample of solid (4502)

F_y_Q — 2018-04-18T05:49:51Z

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

You only have to use the density equation:

Density of a substance (3661)

F_y_Q — 2016-08-08T18:21:41Z

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

Density is defined by:

Knowledge review: True or false questions (3114)

F_y_Q — 2015-04-25T03:59:05Z

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.

a) FALSE. The density of a solution is equal to the mass of the solution divided by the volume of solution.

b) FALSE. The interaction between unlike charges is an attraction force.

c) TRUE.

d) FALSE. Distillation is the correct method to separate a mix of alcohol and water.

General gas law: final volume of a gas (1927)

F_y_Q — 2012-11-05T07:22:34Z

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.

First, isolate the final volume in the general gas equation:

Replace the given data in the equation. Remember that the temperature must be expressed on the Kelvin scale:

Download the problem statement and solution in EDICO format if needed.

Defining pressure, heat and the Molecular Kinetic Theory for gases

F_y_Q — 2012-11-05T07:22:32Z

Define, with your own words, the following concepts:

a) Pressure

b) Heat

c) Molecular Kinetic Theory for gases.

a) Pressure: It is the number of collisions of the particles of a system enclosed in a container, per unit area. It is measured in pascals (Pa) in the International System of Units (SI).

b) Heat: Heat is a form of energy that is transferred between systems or objects with different temperatures. It flows from the hotter object to the cooler one until thermal equilibrium is reached.

c) Molecular Kinetic Theory for gases: The Molecular Kinetic Theory for gases explains the behavior of gases in terms of the motion of their particles. It states that gas pressure is due to the collisions of molecules with the walls of the container, and the temperature of the gas is proportional to the average kinetic energy of the molecules.