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Heating and cooling graphs of state changes
Particle model of matter • Internal energy and heat
Key concepts
What you'll likely be quizzed about
- Heating and cooling graphs plot temperature against time, illustrating how a substance transitions between different states of matter.
- When a solid is heated, its temperature rises until it reaches its melting point.
- At this stage, the solid transforms into a liquid.
- The graph shows a plateau where temperature remains constant as energy is used for melting rather than increasing temperature.
- As heating continues, the temperature of the liquid rises until it reaches the boiling point, where it again plateaus while the liquid changes to gas.
- This plateau indicates that all energy input is used for breaking the intermolecular bonds in the liquid.
- During cooling, the reverse process occurs: temperature drops until the substance reaches its freezing point, where it changes back to a solid.
Flashcards
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Key notes
Important points to keep in mind