States of Matter

Contrast what is the difference between crystalline and amorphous solids?

• Crystalline solids have a well-ordered structure, while amorphous solids do not.

• Crystalline solids are always transparent, while amorphous solids are opaque.

• Crystalline solids are softer than amorphous solids.

• Crystalline solids have a random arrangement of atoms, while amorphous solids have a fixed pattern.

Key Concept Check: Which statement best describes the movement of particles in a liquid and the forces between them?

• Particles in a liquid move freely and are not attracted to each other.

• Particles in a liquid are tightly packed and do not move.

• Particles in a liquid move randomly and are attracted to each other by weak forces.

• Particles in a liquid move in a fixed pattern and are strongly attracted to each other.

Key Concept Check 12. Describe: How do particles move and interact in a gas?

• Particles in a gas move randomly and collide with each other.

• Particles in a gas move in a fixed path without colliding.

• Particles in a gas are stationary and do not interact.

• Particles in a gas move in a circular motion and attract each other.

Unscramble the word: ovarp.

• vapor.

• prova

• parvo

• vorap

Other descriptions, such as mass or volume, are _______.

• Other descriptions, such as mass or volume, are undefined.

• Other descriptions, such as mass or volume, are measurable.

• Other descriptions, such as mass or volume, are irrelevant.

• Other descriptions, such as mass or volume, are constant.

Molecules at the surface of a liquid also have __________, which involves the uneven forces acting on the particles on the surface of a liquid.

• surface tension

• viscosity

• buoyancy

• capillarity

The gas state of a substances that is usually a solid or a liquid at room temperature is called a(n) __________.

• vapor

• gas

• mist

• steam

Read the statement: 'Particles of matter have both potential energy and kinetic energy.' Decide whether you agree or disagree with it. Place an A in the Before column if you agree with the statement or a D if you disagree. After you've read this lesson, reread the statement to see if you have changed your mind.

• Agree

• Disagree

When a solid melts, thermal energy is removed from the solid. Decide whether you agree or disagree with it. Place an A in the Before column if you agree with the statement or a D if you disagree.

• Agree

• Disagree

Reading Check: Infer what must be added to matter to change it from a solid to a liquid?

• Heat

• Cold

• Pressure

• Light