Qualititative Part 1

1. Qualititative Part 1 Sarah McCloskey Alyssa Moore

2. Differences between Chemical and Physical Reactions • Physical Properties • substance stays the same • it is reversible • Chemical Properties • irreversible • composition changes • Examples • tearing • cutting • breaking • melting • freezing • boiling • Examples • fizzing • bubbling • production of gas • formation • absorption of heat and light • production of a precipitate • rust

3. 3 1 4 Physical or Chemical? 2

4. Chemical Reaction

5. Differences between solids, liquids and gases • Solid • definite shape • definite volume • not easily compressed • Liquid • indefinite shape • definite volume • not easily compressed • Gas • indefinite shape • indefinite volume • easily compressed Gas is a form of matter that takes both the shape and volume of its container. Liquid is a form of matter that has an indefinite shape, flows, yet has a fixed volume. Solid is a form of matter that has a definite shape and volume.

6. Solid Liquid Or Gas? 3 1 4 2

7. Particle Movement and Kinetic Energy • The motion of the particles in a gas is rapid, constant and random. • The particles travel in straight-line paths until they collide with another particle, or another object, such as the wall of their container. • The particles change direction only when they rebound from collisions with one another or with other objects. • Particles are in random pattern and constant motion. • To speed up, they get faster and heat up. • This increases entropy (measure of randomness as it becomes a gas) • To slow down, it becomes stationary or a solid which lowers the temperature.