Solids, Liquids And Gases
Übersicht
Put an ice cube on a warm plate and you watch a solid with a fixed shape turn into a liquid that flows into every dent in the china, and then into a gas you cannot see at all. Nothing has been added and nothing has been taken away. The same water particles are there at the end as at the start. All that has changed is how closely those particles are held and how freely they can move.
This lesson gives you the model chemists use to explain that, and then makes you use it. You will describe how particles sit and travel in each of the three states, name every one of the changes between them, learn to say which of those changes takes energy in and which gives it out, work out why a thermometer stops climbing halfway through melting even though the flame is still on, and explain what creates the pressure inside a sealed container of gas. It is a short list of ideas, and almost every question you will ever be asked about matter is answered from it.
Ziele
- Matter can be classified in terms of the three states of matter. Students should be familiar with states of matter and be able to name each inter-conversion process. They should be able to describe and explain their inter-conversion in terms of how the particles are arranged and their movement. They should understand the energy changes that accompany changes of state.
Mindmap
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Unterrichtsbewertung
Herzlichen Glückwunsch zum Abschluss der Lektion über Solids, Liquids And Gases. Jetzt, da Sie die wichtigsten Konzepte und Ideen erkundet haben,
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- Which description matches the particles in a liquid? A. Held in a fixed regular pattern and able only to vibrate B. Close together but disordered, sliding past one another C. Far apart and moving rapidly and randomly in all directions D. Far apart and held in a fixed regular pattern Answer: B
- Which process changes a solid directly into a gas without a liquid forming? A. Condensation B. Evaporation C. Sublimation D. Freezing Answer: C
- A pure solid is heated steadily. Why does its temperature stay constant while it is melting? A. No energy is being supplied during that time B. The energy supplied is used to overcome the forces of attraction between particles C. The particles stop moving completely while melting D. The thermometer responds too slowly to record the change Answer: B
- During which change of state do particles move from a fixed regular arrangement into a disordered arrangement in which they are still touching one another? A. Freezing B. Melting C. Boiling D. Condensing Answer: B
- A gas is sealed in a rigid container and then warmed. Why does its pressure increase? A. The individual gas particles become larger B. The particles strike the walls more often and with greater force C. The number of gas particles in the container increases D. The container contracts as it is warmed Answer: B
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