1.2 Estados de agregación y cambios de estado
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This section discusses the different states of matter and their cohesive forces.
States of Matter
- Solids have high cohesive forces, leading to molecules being tightly packed. Liquids have weaker cohesive forces, allowing for more movement between molecules. Gases have negligible cohesive forces, resulting in dispersed molecules.
- Solids have defined shape and volume due to high cohesion. Liquids take the shape of their container but have a constant volume. Gases expand to fill their container.
- Solid state has low kinetic energy and little freedom of movement. Liquid state has higher kinetic energy, allowing molecules to flow. Gas state has high kinetic energy with complete molecular dispersion.
States Transition and Temperature Effects
This section explains how temperature affects state transitions.
State Transitions
- Heating solid turns it into liquid (fusion). Cooling gas turns it into liquid or solid (condensation). Examples include ice melting and water evaporating.
- Gas turning directly into a solid is sublimation (e.g., dry ice). Liquid turning into a solid is solidification (e.g., freezing water).
- Gas turning directly into a solid without becoming a liquid is crystallization (e.g., snowflakes forming due to low temperatures).
Temperature Effects
- Changing temperature alters states; heating converts solids to liquids or gases, while cooling changes gases or liquids back to solids.