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15. Which statements describe the particles of a metal?
I. particles are packed in a regular arrangement.
II. particles are randomly arranged
III. Particles move past each other.
IV. particles vibrate in fixed points.
a. I and II only
b. II and III only
c. I and IV only
d. II and IV only​

Sagot :

YseCiahidn

Answer:

The correct answer is c. I and IV only. Here's why:

  • Metals are solids: Solids have a fixed shape and volume. This means their particles are tightly packed together.
  • Regular arrangement: Metals have a crystalline structure, meaning their particles are arranged in a regular, repeating pattern. This gives metals their characteristic properties like strength and conductivity.
  • Vibrations: While the particles in a solid are tightly packed, they do vibrate in fixed positions. This vibration increases with temperature.
  • Limited movement: The particles in a solid do not move past each other freely like in a liquid or gas.

Let's look at why the other options are incorrect:

II. Particles are randomly arranged: This is characteristic of liquids and gases, not solids.

III. Particles move past each other: This is also characteristic of liquids and gases, not solids.

Therefore, only statements I and IV accurately describe the particles of a metal.

Explanation:

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