Particle model presentation
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This document discusses the particle model of matter and the three states of matter - solid, liquid, and gas. It describes the characteristics of each state in terms of the forces between particles and how they move. Changes between the states are explained, such as how solids expand with heat and contract with cold, liquids expand more than solids with heat, and water is unique in expanding as it cools until freezing. Examples are given to illustrate these concepts, such as gaps left in rails for expansion, water rising in a glass tube when heated, and how hot air balloons are able to float.
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- In solids, particles are closely packed in a fixed shape and volume. Liquids have a fixed volume but no shape, and particles can move around each other. Gases have no fixed shape or volume, and particles move independently at high speeds.
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Presentation for junior high school science.
Topic: States of Matter: Solids, Liquids and Gases.
Comprehensive 33-slide presentation designed for self-directed learning, although equally useful as a classroom presentation.
Neatly laid out with clear and detailed explanations.
Covers:
• Properties of Solids, Liquids and Gases
• Particles in Solids, Liquids and Gases
• Heat Energy and State Changes
• Expansion and Contraction in Solids, Liquids and Gases
There are several digital and print worksheets available that accompany this presentation.
<a />www.GoodScienceWorksheets.com</a>
*Presentation is in Adobe Acrobat format. View in full screen mode (Ctrl L) and scroll through slides with arrows; Esc to get out of full screen view, navigate through slides using Page Thumbnails on left side of page, just like a PowerPoint presentation.
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- Reflection - Light bounces off surfaces at the same angle it hits. Smoother surfaces reflect better.
- Refraction - Light bends when passing through different materials, changing speed. This causes dispersion into colors.
- Color - Each color has a different wavelength. Color perceived is the wavelength reflected, others are absorbed.
- Vision - Eyes have rods and cones that detect light and send signals to the brain for color and shape recognition.
- Light sources - Incandescent bulbs heat a filament, fluorescent uses phosphors and gas, neon signs use colored gases, lasers emit synchronized waves.
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Particle model presentation
- 2. In our world, matter exists in three states: Solid Liquid Gas
- 3. Solid o Strong forces hold the particles together o The particles only move a little o They do not change position, but vibrate to and fro in one position
- 4. Liquid o The forces that hold the particles together are weaker than in solids o The particles can change position by sliding over each other
- 5. Gas o The forces holding the particles are very small o The particles can travel in all direction
- 6. Changes in Temperature Solid Condensation Liquid Gas Evaporation
- 7. Changes in Solids When a solid is heated, it expands and when it cools it contracts. E.G Railways: There are gaps between the end of the rails. In hot weather, the rail will expand and will buckle up.
- 8. Changes in Liquids When liquids are heated, they expand much more than solids for a given temperature. E.G When water get hot, it expands and rises up the glass tube. While when the water is cool, the level of the water in tube falls
- 9. Strange fact about water! When water cooled, it expands again when it’s temperature drops below 4 degree celcius. After 4 degree celcius, it will start to expand until it reaches 0 degree celcius.
- 10. Changes in Gas o Gases expand when they are heated o Contract when they are cooled E.G. Hot air balloons: When the air in the balloon is heated, it expands and fills the balloon. The density of the air falls and it becomes less dense than the air around it. The surrounding area exerts an upthrust force which is greater than the weight on it.
- 11. Thank You For Paying Attention !!!