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Are the molecules in a gas in constant motion?
Yes, the molecules of a gas are constantly in a random motion if the gas temperature is more than 0 degree kelvin. This random motion determines the average kinetic energy of the molecules which is equal to the temperature of the gas. I hope this answers your question.
What is the most appropriate to express number of molecules per volume?
Avogadro's number is the number of molecules in a mole of a substance. This is expressed as 6.022 141 29 E23 /mol. This is defined as the number of atoms in 12 grams of carbon12. A mole of any gas has this number of molecules. Any fraction of that mole must be divided into the number.
How did avogadro calculated his number?
Amedeo Avogadro did not directly calculate Avogadro's number, but he contributed to the concept of the mole and the relationship between gas volumes and the number of molecules. He proposed that equal volumes of gases, at the same temperature and pressure, contain an equal number of molecules, known as Avogadro's law. This idea laid the groundwork for later scientists, like Jean Perrin, who experimentally determined Avogadro's number by using methods such as Brownian motion in suspensions to relate molecular sizes to macroscopic quantities. Ultimately, Avogadro's number, approximately (6.022 \times 10^{23}), quantifies the number of atoms, ions, or molecules in one mole of a substance.
Four states of matter?
the four states of matter are a solid, liquid ,gas, and plasma the molecules in a solid are tightly packed together in a liquid they take the shape of its container a gas the molecules move freely and in plasma the molecules attract each other positive and negative
What does th 2 in 4h2 mean?
In the chemical formula 4H₂, the "2" indicates that there are two hydrogen atoms in each molecule of hydrogen gas (H₂). The "4" in front signifies that there are four molecules of hydrogen gas, resulting in a total of eight hydrogen atoms (4 x 2 = 8). This notation is part of the molecular formula that represents the composition of a substance.
What is related to the motion of atoms or molecules in a substance?
The motion of atoms or molecules in a substance is related to its temperature, with higher temperatures leading to increased motion. This motion affects the state of matter (solid, liquid, gas) that the substance is in, as well as its properties such as density and viscosity. In gases, the motion of atoms or molecules creates pressure.
How does the molecular motion of a substance change as it transitions from liquid to gas?
As a substance transitions from liquid to gas, the molecular motion increases. In the liquid state, molecules move more freely but are still close together. When the substance becomes a gas, the molecules move even more rapidly and are much farther apart.
In which phases will the molecules of a substance fill whatever size container they are placed in?
In the gas phase, molecules will evenly fill the size of the container they are placed in. This is because gas molecules have high kinetic energy and are in constant motion, spreading out to fill the available space.
Molecule of a substance are in a motion?
Molecules of a substance are in constant motion. Whether you have a solid, liquid, or gas, the particles are moving (but the speed and amount they move differs). Particles of a solid move the least (they basically vibrate), particles of a liquid can flow around one another, and particles of a gas have a lot of space between them because they move in random, constant motions.
Is hydrogen gas a pure substance?
Yes, hydrogen gas is a pure substance because it consists of only hydrogen atoms. It is a homogeneous mixture of identical molecules, making it a pure substance.
Why the motion of gas molecules is also called thermal motion?
The motion of gas molecules is called thermal motion because it is directly related to the temperature of the gas. As the temperature increases, the gas molecules move faster and collide more frequently, leading to an increase in thermal energy and the overall temperature of the gas.
Is a hydrogen gas an example of a mixture?
Hydrogen gas is not an example of a mixture as it consists of only hydrogen molecules. It is a pure substance.
What do you know about gases molecules?
Molecules of a gas are in permanent motion.
How molecular motion changes as a substance changes from one state to another?
As a substance changes from a solid to a liquid, the molecular motion increases as the intermolecular bonds break and the molecules can move past each other more freely. When a substance transitions from a liquid to a gas, the molecular motion increases further as the molecules have enough energy to overcome intermolecular forces entirely and move independently.
Are the molecules in a gas in constant motion?
Yes, the molecules of a gas are constantly in a random motion if the gas temperature is more than 0 degree kelvin. This random motion determines the average kinetic energy of the molecules which is equal to the temperature of the gas. I hope this answers your question.
What is the ability of the gas to completely spread out and mix with other substance?
This is entropy, the tendency for an ordered system to move to a state of lower energy (every thing evenly spread out). Brownian motion (haphazard random motion of molecules) accounts for the motion.
Does gas molecules are constantly in motion?
Yes they do!
