Flashcards
Particle model
Cards in this deck (23)
- 1What are the three states of matter?Solid, liquid and gas
- 2Particle model for solids & properties?-Strong forces of attraction hold the particles close together in a fixed, regular arrangement.
-The particles don't have much energy so they can only vibrate about their fixed positions.
-The density is generally higher in this state as the particles are closest together. - 3Particle model for liquids & properties?-There are weaker forces of attraction between particles.
-The particles are closer together, but can move past each other, and for irregular arrangements.
-Liquids have more energy than solids, but less than gases.
-They move in random directions at low speeds.
-Liquids are less dense than solids. - 4Particle model for gases & properties?-There are almost no forces of attraction between the particles.
-Gases have more energy than solids or liquids.
-They are free to move, and travel at random directions and at high speeds.
-Gases have low densities. - 5What is density?Density is a measure of the 'compactness' of a substance. It's how much mass is packed into a given volume.
- 6The units for density?The units for density is: kg/m3.
-The mass is in kg.
-The volume is in m3. - 7Formula for density?Density (kg/m3) = Mass (kg) / Volume (m3).
- 8Density facts-The density of an object depends on what it's made of.
-A dense material has its particles packed tightly together. The particles in a less dense material are more spread out. If you compressed the material, its particles would move closer together, and it will become more dense. - 9What is internal heat?The internal heat of a system is the total energy that its particles have in their kinetic and potential energy stores.
- 10Is a change of state a physical or chemical change?A physical change, which means you don't end up with a new substance (it's the same substance as you started with, just in a different form).
- 11Does mass stay the same when a substance changes state?Yes.
- 12Changing from solids to liquids?Melting
- 13Changing from liquids to gases?Boiling or evaporating
- 14Changing form gases to liquids?Condensing
- 15Changing from liquids to solids?Freezing
- 16Changing from solids to gases?Sublimating
- 17Melting or boilingWhen a substance is melting or boiling, you're still putting in energy. So the internal energy is increasing but is using up all the energy in breaking up the intermolecular bonds instead of increasing the temperature. This is represented by flat spots on graphs.
- 18Condensing or freezingWhen a substance is condensing or freezing, bonds are forming between particles, which releases energy. This means that the internal energy is decreasing, but the temperature stays constant until all the substance has turned to liquid (condensing) or a solid (freezing). This is represented by flat spots on graphs.
- 19What is specific latent heat?The specific latent heat of a substance is the amount of energy needed to change 1kg of it from one state to another without changing its temperature.
- 20Specific latent heat of fusionThe specific latent heat of fusion is the change of state from solids to liquids.
- 21Specific latent heat of vaporisationThe specific latent heat of vaporization is the change of state from liquids to gases.
- 22The units for specific latent heat?The units for specific latent heat is: J/kg.
-The energy is in J.
-The mass is in kg. - 23Formula for specific latent heat?SLH (L) = Energy (E) / Mass (Kg)
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- 3º de ESO Física (Topic 3: Particle Model of Matter) Flashcards on Particle model, created by Carmen Diaz on 24/04/2018.
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- Carmen Diaz
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