particle model

Question 1

describe the arrangement of particles in a solid

Answer 1

• strong forces of attraction hold the particles close together in a fixed, regular arrangement
• particles don’t have much energy so can only vibrate about their fixed positions
• density is generally highest as particles are closest together

Question 2

describe the arrangement of particles in a liquid

Answer 2

• weaker forces of attraction between particles
• particles are close together but can move past each other, and form irregular arrangments
• more energy than solid
• move in random directions at low speeds

Question 3

describe the arrangement of particles in a gas

Answer 3

• almost no forces of attraction between particles
• more energy than solid or liquid
• free to move
• move in random direction at high speeds
• lowest density as less packed