Question

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5. short answer question (30 words)

1) how does the movement of particles in solids, liquid and gas depend upon the kinetic energy.
2) how does the kinetic energy of the particles of a solid change when heated
3)define the law of conservation of mass also give an example to prove it
4) why do gases have low densities
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Answer 1

Answer:

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Explanation:

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Answer 2

Explanation:

1.The attractive force in solids need not be stronger than in liquids or gases. ... Attractive forces don't get weaker when a substance moves from the solid to the liquid to the gas state, rather the kinetic energy of the particles increases (implying faster motion), allowing them to overcome the attractive forces.

2.When a solid is heated, its atoms vibrate faster about their fixed points. ... Heat causes the molecules to move faster, (heat energy is converted to kinetic energy ) which means that the volume of a gas increases more than the volume of a solid or liquid

3.According to the law of conservation of mass, the mass of the reactants must be equal to the mass of the products for a low energy thermodynamic process.

It is believed that there are a few assumptions from classical mechanics which define mass conservation. Later the law of conservation of mass was modified with the help of quantum mechanics and special relativity that energy and mass are one conserved quantity. In 1789, Antoine Laurent Lavoisier discovered the law of conservation of mass.

Law of Conservation of Mass Examples

Combustion process: Burning of wood is a conservation of mass as the burning of wood involves Oxygen, Carbon dioxide, water vapor and ashes.

Chemical reactions: To get one molecule of H2O (water) with the molecular weight of 10, Hydrogen with molecular weight 2 is added with Oxygen whose molecular weight is 8, thereby conserving the mass.

4.Gases are less dense than solids and liquids because their molecules are far apart in comparison to solids and liquids. ... The greater the volumemass, the more dense the material is. Because the molecules of a gas are spread apart, they have the least volumemass, and are therefore less dense.