Presentation on theme: "Solids, Liquids and Gases"— Presentation transcript:
1Solids, Liquids and Gases KS3 ChemistrySolids, Liquids and Gases
27G Solids, Liquids and Gases Contents7G Solids, Liquids and GasesIntroducing states of matterThe particle modelProperties of solids, liquids and gasesDiffusionSummary activities
3Different substancesWhat are the names of the substances described in this table?(The first letters spell out another word for ‘substance’.)Liquid metalSolid used in aircraftSolid used to coat steel cansIntoxicating liquidRadioactive solidSolid that rustsUnreactive gasSolid used by Roman plumbersMercuryAluminiumTinEthanolRadiumIronArgonLeadAluminiumLeadEthanolRadiumWhat different types of materials are there?ArgonMercuryIronTin
4solid liquid gas Three states of matter At room temperature most substances exist in one of three physical states.solidliquidgas
77G Solids, Liquids and Gases Contents7G Solids, Liquids and GasesIntroducing states of matterThe particle modelProperties of solids, liquids and gasesDiffusionSummary activities
8particle model The particle model The difference between solids, liquids and gases can be explained by the…particle modelAll substances are made up of particles.The particles are attracted to each other. Some particles are attracted strongly to each other and others weakly.The particles move around. They are described as having kinetic energy.The kinetic energy of the particles increases with temperature.
157G Solids, Liquids and Gases Contents7G Solids, Liquids and GasesIntroducing states of matterThe particle modelProperties of solids, liquids and gasesDiffusionSummary activities
16How do smells spread out? Where is the smell coming from and how does it spread out?
17What is diffusion?Diffusion is the movement of particles that allows them to spread out and mix with other particles.For example, the smell of aftershave or perfume diffuses and is detected by people on the other side of the room.Use the particle model to explain these facts about diffusion:Diffusion occurs in liquids and gases but hardly at all in solids.Diffusion happens more quickly for gases than for liquids.Diffusion happens more quickly at warm temperatures than at cooler temperatures.
20Diffusion experimentIn this experiment, two gases diffuse towards each other in a sealed glass tube.gasesmeetherecotton wool soaked in ammonia solutioncotton wool soaked in concentrated hydrochloric acidWhen the gases meet, they react to form a ring of ammonium chloride which is closer to one end of the tube than the other.Which gas particles diffuse faster, ammonia or acid, and why?By the time the gases meet, the ammonia particles have travelled further down the tube so they must have diffused at a faster speed.
217G Solids, Liquids and Gases Contents7G Solids, Liquids and GasesIntroducing states of matterThe particle modelProperties of solids, liquids and gasesDiffusionSummary activities
22Glossarydiffusion – Particles spreading out and mixing in the gas or liquid state.gas – The state of matter in which particles move quickly in all directions and rarely touch each other.liquid – The state of matter in which particles are randomly arranged and touch each other.matter – The stuff that everything is made of.particle – The smallest unit of matter.pressure – The force produced when particles move against a surface.solid – The state of matter in which particles are in a fixed arrangement and touch each other.
24Crossword Across: 2. Change from liquid to solid 5. Force caused by collisions of particles6. Arranged in a 3-dimensional pattern9. Spacing of particles in solids and liquids10. All substances are this state at very low temperatures11. Only liquids and gases do this1234567891011Down:1. Closely packed particles 6. Particles are close but disorganised3. Change from gas to liquid 7. Particles widely spread out4. Change from solid to liquid 8. Change from liquid to gas