Change Of State
Muhtasari
Heat a block of ice steadily and something remarkable happens: the temperature rises, pauses, rises again, pauses once more, then climbs a third time. Those pauses mark the moments when the substance is changing state, and understanding why the thermometer stalls is the key to unlocking this entire topic.
This lesson takes you through the particle model of solids, liquids and gases, explains every change of state, introduces specific heat capacity and the equation that links energy to temperature change, and shows you how to read and interpret heating curves. These ideas appear regularly across both Edexcel Papers 1 and 2.
Malengo
- Explain why heating a system will change the energy stored within the system and raise its temperature or produce changes of state
- Describe the changes that occur when a solid melts to form a liquid, and when a liquid evaporates or boils to form a gas
- Describe the arrangement and motion of particles in solids, liquids and gases
- Obtain a temperature-time graph to show the constant temperature during a change of state
- Know that specific heat capacity is the energy required to change the temperature of an object by one degree Celsius per kilogram of mass
- Use the equation: change in thermal energy = mass x specific heat capacity x change in temperature
- Investigate the specific heat capacity of materials including water and some solids
Maelezo ya Somo
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Tathmini ya Somo
Hongera kwa kukamilisha somo la Change Of State. 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 statement correctly describes the particles in a liquid? A) They vibrate about fixed positions B) They are far apart and move randomly C) They are close together and can slide past each other D) They are arranged in a regular pattern Answer: C
- During boiling, the temperature of a pure substance: A) Increases steadily B) Decreases steadily C) Stays constant D) Fluctuates up and down Answer: C
- What is the specific heat capacity of a substance? A) The energy needed to melt 1 kg of the substance B) The energy needed to raise 1 kg by 1 degree Celsius C) The temperature at which the substance changes state D) The energy stored in the bonds of the substance Answer: B
- A flat section on a heating curve indicates that: A) The heater has been switched off B) The substance has reached its maximum temperature C) A change of state is occurring D) The substance is cooling down Answer: C
- Which process is the reverse of melting? A) Boiling B) Evaporation C) Condensation D) Freezing Answer: D
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Pakua programu ya Green Bridge CBT kwenye simu yako au kompyuta yako ili kupata maelezo kamili ya masomo, maswali ya mazoezi, na mengi zaidi.
Vitabu Vinavyopendekezwa
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