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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.

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Presentation on theme: "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."— Presentation transcript:

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3 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 thats 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

4 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 liquids 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.

5 MeltingVaporization Solid Liquid Gas Freezing Condensation Melting Point Boiling Poing Sublimation

6 1. Changes Between Solid and Liquid A. 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.

7 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

8 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.

9 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.

10 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.

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12 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.

13 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. Boyles 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 Boyles law.

14 3. Pressure and Temperature A. 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 Temperature A.Charless 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 Charless law.

15 1. 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 Charless law shows that the volume of a gas is directly proportional to its kelvin temperature under constant pressure.

16 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 Boyles law shows that the pressure of a gas varies inversely with its volume at constant temperature


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