The particle model of matter explains that everything around us – solids, liquids, and gases – is made up of tiny particles that are constantly moving. These particles can be atoms or molecules. The way these particles are arranged and how they move determines whether something is a solid, liquid, or gas. In solids, particles are tightly packed and vibrate in fixed positions. In liquids, particles are close together but can move around each other. In gases, particles are far apart and move freely.
Match the terms with their correct definitions:
| Term | Definition |
|---|---|
| 1. Solid | A. Particles are far apart and move freely. |
| 2. Liquid | B. The basic unit of matter. |
| 3. Gas | C. Particles are close together but can move around. |
| 4. Atom | D. Two or more atoms held together by chemical bonds. |
| 5. Molecule | E. Particles are tightly packed and vibrate in fixed positions. |
(Answers: 1-E, 2-C, 3-A, 4-B, 5-D)
Use the words in the box to complete the paragraph. (particles, solid, liquid, gas, motion)
The particle model of matter describes the arrangement and ______ of ______ in different states. In a ______, the particles are tightly packed. In a ______, they are close but can move. In a ______, they are far apart.
(Answers: motion, particles, solid, liquid, gas)
Explain how the particle model of matter helps us understand why a balloon filled with air takes up more space than the same amount of air squeezed into a small container.
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