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:

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.The law of conservation of mass states that matter cannot be created or destroyed in a chemical reaction. For example, when wood burns, the mass of the soot, ashes, and gases, equals the original mass of the charcoal and the oxygen when it first reacted. So the mass of the product equals the mass of the reactant.

4.Gases have lower density than other states of matter, such as solids and liquids. ... When more gas particles enter a container, there is less space for the particles to spread out, and they become compressed. The particles exert more force on the interior volume of the container.

Answer 2

Answer:

1) The particle which us free to move have highest kinetic energy

Gas has highest kinetic energy followed by liquid and solid

2) When a solid is heated, its particles vibrate faster. Due to heat the particle converted into kinetic energy

3) It states that matter neither can be created nor be destroyed. It can change from one form to another form

eg- When wood burns, the soot, ashes and gases equal to the original mass of the charcoal and oxygen when it was reacted. So mass of product equal to mass of reactant

4) Gases are less dense than solid and liquid because their molecules are far apart in comparison to solid and liquid, they have the least volume and therefore less dense