Solids, liquids, and GasesFernanda Tome, Fuad Hasbun, Monique

Masso and Natalia Nufio

States of Matter

2. Liquids

•Liquids are a type of matter that have an undefined shape but definite volume.

A. Particles in a liquid

• The particles in a liquid are packed almos as closely as in a solid.

• Particles are free to move that’s why a liquid has no definite shape. But it has a definite volume.

•For this reason a liquid is also called a fluid “a substance that flows”

B. Properties of liquid

• Surface Tension is the result of an inward pull among the molecules of a liquid that brings the molecules on the surface closer together

•Viscosity is the liquid’s resistance to flowing.

3. Gases

•A gas is a different type of matter; it has an undefined volume and undefined shape.

•As they move, gas particles spread apart, filling all the space available. Thus, a gas has neither definite shape nor definite volume.

Changes of StateMelting Vaporization

Solid Liquid Gas

Freezing Condensation

Melting Point Boiling Poing

Sublimation

1. Changes Between Solid and LiquidA. Melting

•Melting is the change in state from a solid to a liquid

•Melting point: the specific point in which melting starts

•At its melting point, the particles of a solid substance are vibrating so fast that they break free from their fixed positions.

B. Freezing

•Freezing is the change in state from liquid to solid

•At its freezing temperature, the particles of a liquid are moving so slowly that they begin to form regular patterns

2. Changes Between Liquid and Gas

•Vaporization takes place when the particles in liquid gain enough energy to form a gas

•Vaporization is the change from a liquid to a gas.

A. Evaporation

•Evaporation is vaporization that takes place only on the surface of a liquid.

B. Boiling

•Boiling is a different kind of vaporization

C. Boiling Point and Air Pressure

•The boiling point of a substance depends on the pressure of the air above it.

D. Condensation

•Condensation is the opposite of vaporization; the change of state from a gas to liquid.

•Condensation occurs when particles in a gas lose enough thermal energy to form a liquid.

3. Changes Between Solid and Gas

•Sublimation is the change of state from a solid directly to a gas.

•During sublimation, particles of a solid do not pass through the liquid state as they form a gas.

Gas Behavior

1. Measuring Gases•When working with a gas, it is helpful to know its volume, temperature, and pressure.

A. Volume

• Volume is the amount of space that matter fills.

B. Temperature

• Temperature is a measure of the average energy of random motion of the particles of a substance.

C. Pressure

• The pressure of the gas is the force of its outward push divided by the area of the walls of the container.

2. Pressure and Volume

A. Boyle’s Law

• Boyle found that when the pressure of a gas at constant temperature is increased the volume of the gas decreases. When the pressure is decreased, the volume increases.

•The relationship between the pressure and the volume of a gas is called Boyle’s law.

3. Pressure and TemperatureA. Increasing Temperature Raises Pressure•When the temperature of a gas at constant volume is increased, the pressure of the gas increases. When the temperature is decreased, the pressure of the gas decreases.

B. Pressure and Temperature in Action

• In a tire if the pressure of the air inside the tire increases then the tire will burst.

4. Volume and TemperatureA. Charles’s Law

• Charles found that when the temperature of a gas is increased at constant pressure, its volume increases. When the temperature of a gas is decreased at constant pressure, its volume decreases, this principle is called Charles’s law.

GRAPHING GAS BEHAVIOR1. Temperature and Volume

A. Collecting Data

• Always record the information of your observation

B. Graphing the Results

• Oring in is the point called (0, 0)

• When a graph of two variables is a straight line passing through the origin, the variables are said to be directly proportional to each other.

•The graph of Charles’s law shows that the volume of a gas is directly proportional to its kelvin temperature under constant pressure.

2. Pressure and Volume

A. Collecting Data

• Inferring is important while you are collecting data

B. Graphing the Results

• When a graph of two variables forms this kind of curve, the variables are said to vary inversely with one another.

•The graph for Boyle’s law shows that the pressure of a gas varies inversely with its volume at constant temperature