Changes of State
2 guided lessons · 18 checks · 5. Solids, Liquids and Gases → Changes of State
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Naming the state changes and their energy flows
Six named transitions connect the three states, three driven by heating and three by cooling. Each transition carries an energy signature: taken in while bonds loosen, released while bonds tighten.
What you know already
Heating does not always show up on a thermometer. Supplied energy can push a substance up in temperature, or it can be spent rearranging particles as the substance melts, evaporates or boils. This note names every state change, tracks the energy in and out, and separates heat from temperature.
Key points of understanding
- Melting turns a solid into a liquid; freezing turns a liquid into a solid.
- Evaporation and boiling turn a liquid into a gas; condensation turns a gas into a liquid.
- Melting, evaporation and boiling are endothermic — energy is absorbed from the surroundings.
- Freezing and condensation are exothermic — energy is released to the surroundings.
- Sublimation turns a solid directly into a gas without passing through the liquid state.
Changing the temperature of a solid, liquid or gas changes its state
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1.Naming the state changes and their energy flows
Six named transitions connect the three states, three driven by heating and three by cooling. Each transition carries an energy signature: taken in while bonds loosen, released while bonds tighten.
Changing the temperature of a solid, liquid or gas changes its state
Key points
- Melting turns a solid into a liquid; freezing turns a liquid into a solid.
Guided content from the SME authoring corpus — note rn_tq52Kk7NNvjdsnPx, pinned at 8788fc85a2c1 · promoted SyllabAI/syllabai-resources b3caaaa90c5e
