States of Matter Lesson 13

Activator Cont. List the three types of matter with 3 examples of each Solid  Rock, wood, Gold Liquid  Water, mercury, soup Gas  Air, helium, CO2

Solids A Solid has a definite shape and a definite volume When you move it from place to place, it does not change It will keep its shape and volume in any position and in any container Particles is a Solid The particles that make up a solid are packed very close together Each particle is tightly fixed in that position This tightly packed arrangement of particles cause the solid to have a definite shape and volume

Types of Solids https://www.youtube.com/watch?v=dtxrtKd-Vao Two types Crystalline solids particles are in a repeating pattern Melts at specific temperature Ex. Salt, sugar, snow Amorphous solids Particles are not arranged in a regular pattern Does not melt at a distinct temperature  becomes softer or transforms Ex. Plastics, rubber https://www.youtube.com/watch?v=dtxrtKd-Vao Is glass a crystalline or amorphous solid?

Liquids Liquids have a definite volume but no shape of its own Constant volume Takes the shape of the container its in Particles more about freely Liquids are called fluids meaning “a substance that flows” Marbles in hand. Particles stay in contact with each other but are able to slide around each other

Properties of Liquids Surface Tension Viscosity Attraction between water molecules is strong Allows for surface tension Bugs walk on water Viscosity Liquids resistance to flowing Depends o size and shape of its particles and their attraction Ex. Honey  High viscosity Ex. Water  Low viscosity

Gases Gases have no definite shape or volume Particles more freely Can be contained but particles will spread once released

Reviewing Key Concepts 1. What are some general characteristics of solids 2. How do crystalline solids differ from amorphous 3. How many liquids be described in terms or shape and volume? 4. Explain why a sewing needle can float on the surface of water/ 5. Why does a gas have no definite shape or volume? Be prepared to share. This is a grade