Chapter 1, Lesson 4 Multimedia
Particles of a Solid
- The atoms of a solid are strongly attracted to each other
- Solids keep their shape because of these strong attractions
- The atoms vibrate but do not move past each other
Comparing Solid and Liquid
- The atoms of a solid are so attracted to each other that they vibrate and don't move past each other.
- The molecules of a liquid are attracted to each other, but move more freely than the atoms of a solid. The molecules of a liquid are able to move past one another.
Heating and Coooling a Metal Ball
- At room temperature, the ball fits through the ring.
- When the metal ball is heated enough, it will not fit through the ring.
- When the ball is cooled back to room temperature, it fits through the ring again.
Heating and Cooling a Solid
- When a solid is heated, the particles move faster and move slightly further apart
- When a solid is cooled, the particles move slower and move slightly closer together
Molecules in a Room Temperature and Hot Metal Ball
- At room temperature, the atoms in the ball vibrate but do not move past each other
- When the metal ball is heated, the atoms vibrate faster. Their motion competes with their attractions and the move a little further apart
- Lesson 1: Water is a Polar Molecule
- Lesson 2: Surface Tension
- Lesson 3: Why Does Water Dissolve Salt?
- Lesson 4: Why Does Water Dissolve Sugar?
- Lesson 5: Using Dissolving to Identify an Unknown
- Lesson 6: Does Temperature Affect Dissolving?
- Lesson 7: Can Liquids Dissolve in Water?
- Lesson 8: Can Gases Dissolve in Water?
- Lesson 9: Temperature Changes Dissolving
- Lesson 1: What is a Chemical Reaction?
- Lesson 2: Controlling the Amount of Products in a Chemical Reaction
- Lesson 3: Forming a Precipitate
- Lesson 4: Temperature and the Rate of a Chemical Reaction
- Lesson 5: A Catalyst and the Rate of Reaction
- Lesson 7: Energy Changes in Chemical Reactions
- Lesson 8: pH and Color Change
- Lesson 9: Neutralizing Acids and Bases
- Lesson 10: Carbon Dioxide Can Make a Solution Acidic
- Lesson 12: Natural Resources & Synthetic Materials