Qualititative

Part 1

Sarah McCloskeyAlyssa Moore

Differences between Chemical and Physical

ReactionsPhysical Properties• substance stays the

same• it is reversibleExamples• tearing• cutting• breaking• melting• freezing• boiling

Chemical Properties• irreversible• composition

changes

Examples• fizzing• bubbling• production of gas• formation• absorption of heat and

light• production of a

precipitate• rust

Physical or Chemical?

14

3

2

Chemical Reaction

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

Solid is a form of matter that has a

definite shape and volume.

Liquid is a form of matter that has an indefinite shape,

flows, yet has a fixed volume.

Gas is a form of matter that takes both the shape

and volume of its container.

1

2

3

4

SolidLiquid

Or Gas?

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.