Starter ClueExample Change in color? Production of gas? Formation of precipitate? Copy the table. Think of an example representing each clue.

States of Matter Day 50

Describing Matter Materials can be classified as solids, liquids, or gases based on whether their shapes and volumes are definite or variable.

Solid State Molecules are fixed; they are close together; definite volume and definite shape

Liquid State Molecules slide past each other; definite volume but no definite shape

Gaseous State Molecules are freely moving; no definite shape or volume

Poetry in Motion Solids: Hold hands, cannot move feet –Shake back in forth in place Liquids: Hold hands, can move feet –Flow in and out Gases: Completely detached, move quickly in any random direction

Use the Force If molecules move, why stick together? Intramolecular Forces –Hold atoms together Intermolecular Forces –Keep molecules together

Phase Change A phase change is a reversible physical change that occurs when a substance changes from one state pf matter to another. Melting, freezing, vaporization, condensation, sublimation, and deposition are six common phase changes. The temperature of a substance does not change during a phase change

Phase Changes Directions: Identify as freezing, melting, condensation, vaporization. a. c. d.b.

What causes change of state? Adding energy in the form of heat will overpower intermolecular forces and cause ice to turn to water, and eventually steam.

Phase Change Energy is either absorbed or released during a phase change The system is considered endothermic, if it absorbs energy from its surroundings. The system is considered exothermic, if it releases energy to its surroundings.

Draw the Phase changing Diagram on the Right. Ga s Solid

Explain Directions: Label the following intervals of the graph. With one of the following terms: gas, solid, liquid, liquid to gas, solid to liquid, ice, steam, melting, evaporating. 1. A-B= 2. B-C= 3. C-D= 4. D-E= 5. E-F=

States of Matter

Exit Slip Directions: In a paragraph explain why ice melts, then turns into a liquid, and then turns into a gas. Use the following terms gain heat, lose heat, kinetic energy, molecules, melting, evaporating, solid, liquid, gas.