Solids, Liquids And Gases
Muhtasari
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, work out why a thermometer stops climbing halfway through melting even though the flame is still on, explain what creates the pressure inside a sealed container of gas, and read the evidence that particles are real and moving from three diffusion experiments you can watch happen on a bench.
Malengo
- 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.
- Evidence for the existence of particles can be obtained from simple experiments. Students should be familiar with simple diffusion experiments such as Br2/air, NH3/HCl, KMnO4/water.
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Maelezo ya Somo
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Tathmini ya Somo
Hongera kwa kukamilisha somo la Solids, Liquids And Gases. Sasa kwa kuwa umechunguza dhana na mawazo muhimu, ni wakati wa kuweka ujuzi wako kwa mtihani. Sehemu hii inatoa mazoezi mbalimbali maswali yaliyoundwa ili kuimarisha uelewaji wako na kukusaidia kupima ufahamu wako wa nyenzo.
Utakutana na mchanganyiko wa aina mbalimbali za maswali, ikiwemo maswali ya kuchagua jibu sahihi, maswali ya majibu mafupi, na maswali ya insha. Kila swali limebuniwa kwa umakini ili kupima vipengele tofauti vya maarifa yako na ujuzi wa kufikiri kwa makini.
Tumia sehemu hii ya tathmini kama fursa ya kuimarisha uelewa wako wa mada na kubaini maeneo yoyote ambapo unaweza kuhitaji kusoma zaidi. Usikatishwe tamaa na changamoto zozote utakazokutana nazo; badala yake, zitazame kama fursa za kukua na kuboresha.
- 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
- In the ammonia and hydrogen chloride experiment, the white ring forms nearer the hydrochloric acid end of the tube. Why? A. Ammonia particles have a greater relative molecular mass B. Hydrogen chloride is denser than the air in the tube C. Ammonia particles have a smaller relative molecular mass and so diffuse faster D. Hydrogen chloride is released more slowly from the cotton wool Answer: C
- 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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