Chapter 2 Lesson 1 Thursday, May 09, 2013 States of Matter States of Matter Prepared by: Taqwa Taisir- Al-Bashair Private School
Objectives of the lesson • Describe the properties shared by particles of all matter. • Describe three stats of matter. • Explain the differences between the states of matter.
States of Matter • We saw three states of matter: • Solid Liquid Gas • The state of matter: the physical form in which a substance can exist. • Example: Water exists in three forms: • Solid (ice) • Liquid (water) • Gas (steam)
Particles of Matter • Matter is made of tiny particles called atoms and molecules. • Atoms and molecules are always in motion. • The particles interact with each other, and the way they interact helps determine the state of the matter.
Solids • State of matter that has definite “fixed” volume and shape. • Particles of solids are very close together. • The attraction between them is stronger than in liquid or gaseous state. • Particles’ movement: • Each particle vibrates in place.
Liquids • State of matter that has a definite volume but not a definite shape. • The liquid takes the shape of its container. • Particles’ movement: • The particles slide past each other and move fast.
Liquids • Unique characteristics of liquids: • 1. Surface tension: • It is the force that acts on the particles at the surface of a liquid. • Different liquids have different surface tensions. • Example: gasoline has a very low surface tension and forms flat drops. • It causes some liquids to form spherical drops.
Liquids • 2. Viscosity: • It is the liquid’s resistance to flow. • The stronger the attraction betweenmolecules of the liquid, the more viscous the liquid is. • Examples: • Honey flows more slowly than water, so, honey has a higher viscosity than water.
Gases • State of matter that has no definite shape or volume. • Particles’ movement: • The particles move quickly, because there is less attraction between the particles.