# KINETIC MOLECULAR THEORY OF MATTER

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1 KINETIC MOLECULAR THEORY OF MATTER The kinetic-molecular theory is based on the idea that particles of matter are always in motion. The theory can be used to explain the properties of solids, liquids, and gases in terms of the energy of particles and the forces that act between them. The Kinetic- of Gases An ideal gas is a hypothetical gas that perfectly fits all the assumptions of the kinetic-molecular theory. The kinetic-molecular theory of gases is based on the following five assumptions: 1. Gases consist of large numbers of tiny particles that are far apart relative to their size. Most of the volume occupied by a gas is empty space

2 2. Collisions between gas particles and between particles and container walls are elastic collisions. An elastic collision is one in which there is no net loss of total kinetic energy. 3. Gas particles are in continuous, rapid, random motion. They therefore possess kinetic energy, which is energy of motion. 4. There are no forces of attraction between gas particles. 5. The temperature of a gas depends on the average kinetic energy of the particles of the gas. The kinetic energy of any moving object is given by the following equation: 1 KE m 2 2 GASES

3 The Kinetic- and the Nature of Gases All gases at the same temperature have the same average kinetic energy. At the same temperature, lighter gas particles, have higher average speeds than do heavier gas particles. Hydrogen molecules will have a higher speed than oxygen molecules. The Kinetic- and the Nature of Gases The kinetic-molecular theory applies only to ideal gases. Many gases behave nearly ideally if pressure is not very high and temperature is not very low. Expansion Gases do not have a definite shape or a definite volume. They completely fill any container in which they are enclosed. The Kinetic- and the Nature of Gases, Expansion Gas particles move rapidly in all directions (assumption 3) without significant attraction between them (assumption 4). Fluidity Because the attractive forces between gas particles are insignificant (assumption 4), gas particles glide easily past one another. Because liquids and gases flow, they are both referred to as fluids.

4 The Kinetic- and the Nature of Gases Low Density The density of a gaseous substance at atmospheric pressure is about 1/1000 the density of the same substance in the liquid or solid state. The reason is that the particles are so much farther apart in the gaseous state (assumption 1). Compressibility During compression, the gas particles, which are initially very far apart (assumption 1), are crowded closer together. The Kinetic- and the Nature of Gases Diffusion and Effusion Gases spread out and mix with one another, even without being stirred. The random and continuous motion of the gas molecules (assumption 3) carries them throughout the available space. Such spontaneous mixing of the particles of two substances caused by their random motion is called diffusion. The Kinetic- and the Nature of Gases Diffusion and Effusion, continued Effusion is a process by which gas particles pass through a tiny opening. The rates of effusion of different gases are directly proportional to the velocities of their particles. Molecules of low mass effuse faster than molecules of high mass.

5 LIQUIDS Properties of Liquids and the Kinetic- A liquid can be described as a form of matter that has a definite volume and takes the shape of its container. The attractive forces between particles in a liquid are more effective than those between particles in a gas. This attraction between liquid particles is caused by the intermolecular forces: dipole-dipole forces London dispersion forces hydrogen bonding Properties of Liquids and the Kinetic-, The particles in a liquid are not bound together in fixed positions. Instead, they move about constantly. A fluid is a substance that can flow and therefore take the shape of its container. Relatively High Density At normal atmospheric pressure, most substances are hundreds of times denser in a liquid state than in a gaseous state.

6 Properties of Liquids and the Kinetic- Relative Incompressibility Liquids are much less compressible than gases because liquid particles are more closely packed together. Ability to Diffuse Any liquid gradually diffuses throughout any other liquid in which it can dissolve. The constant, random motion of particles causes diffusion in liquids. Properties of Liquids and the Kinetic- Ability to Diffuse Diffusion is much slower in liquids than in gases. Liquid particles are closer together. The attractive forces between the particles of a liquid slow their movement. As the temperature of a liquid is increased, diffusion occurs more rapidly. Properties of Liquids and the Kinetic- Surface Tension A property common to all liquids is surface tension, a force that tends to pull adjacent parts of a liquid s surface together, thereby decreasing surface area to the smallest possible size. The higher the force of attraction between the particles of a liquid, the higher the surface tension. The molecules at the surface of the water can form hydrogen bonds with the other water, but not with the molecules in the air above them.

7 Properties of Liquids and the Kinetic- Surface Tension Capillary action is the attraction of the surface of a liquid to the surface of a solid. This attraction tends to pull the liquid molecules upward along the surface and against the pull of gravity. The same process is responsible for the concave liquid surface, called a meniscus, that forms in a test tube or graduated cylinder. Chapter 10 Section 2 Liquids Properties of Liquids and the Kinetic-, continued Evaporation and Boiling The process by which a liquid or solid changes to a gas is vaporization. Evaporation is the process by which particles escape from the surface of a nonboiling liquid and enter the gas state. Boiling is the change of a liquid to bubbles of vapor that appear throughout the liquid. Evaporation occurs because the particles of a liquid have different kinetic energies. Properties of Liquids and the Kinetic- Formation of Solids When a liquid is cooled, the average energy of its particles decreases. The physical change of a liquid to a solid by removal of energy as heat is called freezing or solidification.

8 SOLIDS Section 3 Solids Properties of Solids of Solids and and the the Kinetic- Kinetic- Theory The particles of a solid are more closely packed than those of a liquid or gas. All interparticle attractions exert stronger effects in solids than in the corresponding liquids or gases. Attractive forces tend to hold the particles of a solid in relatively fixed positions. Solids are more ordered than liquids and are much more ordered than gases. Properties of Solids and the Kinetic-, continued There are two types of solids: crystalline solids and amorphous solids. Most solids are crystalline solids they consist of crystals. A crystal is a substance in which the particles are arranged in an orderly, geometric, repeating pattern. An amorphous solid is one in which the particles are arranged randomly.

9 Properties of Solids and the Kinetic- Definite Shape and Volume Solids can maintain a definite shape without a container. Crystalline solids are geometrically regular. The volume of a solid changes only slightly with a change in temperature or pressure. Solids have definite volume because their particles are packed closely together. Properties of Solids and the Kinetic- Definite Melting Point Melting is the physical change of a solid to a liquid by the addition of energy as heat. The temperature at which a solid becomes a liquid is its melting point. At this temperature, the kinetic energies of the particles within the solid overcome the attractive forces holding them together. Properties of Solids and the Kinetic- Definite Melting Point, Amorphous solids have no definite melting point. example: glass and plastics Amorphous solids are sometimes classified as supercooled liquids, which are substances that retain certain liquid properties even at temperatures at which they appear to be solid. These properties exist because the particles in amorphous solids are arranged randomly.

10 Properties of Solids and the Kinetic- High Density and Incompressibility In general, substances are most dense in the solid state. The higher density results from the fact that the particles of a solid are more closely packed than those of a liquid or a gas. For practical purposes, solids can be considered incompressible. Properties of Solids and the Kinetic- Low Rate of Diffusion The rate of diffusion is millions of times slower in solids than in liquids Crystalline Solids Crystalline solids exist either as single crystals or as groups of crystals fused together. The total three-dimensional arrangement of particles of a crystal is called a crystal structure. The arrangement of particles in the crystal can be represented by a coordinate system called a lattice. The smallest portion of a crystal lattice that shows the three-dimensional pattern of the entire lattice is called a unit cell.

11 Unit Cells Crystalline Solids A crystal and its unit cells can have any one of seven types of symmetry. Binding Forces in Crystals Crystal structures can also be described in terms of the types of particles in them and the types of chemical bonding between the particles. Crystalline Solids Binding Forces in Crystals 1. Ionic crystals The ionic crystal structure consists of positive and negative ions arranged in a regular pattern. Generally, ionic crystals form when Group 1 or Group 2 metals combine with Group 16 or Group 17 nonmetals or nonmetallic polyatomic ions. These crystals are hard and brittle, have high melting points, and are good insulators.

12 Crystalline Solids, Binding Forces in Crystals, Covalent network crystals In covalent network crystals, each atom is covalently bonded to its nearest neighboring atoms. The covalent bonding extends throughout a network that includes a very large number of atoms. The network solids are very hard and brittle, have high melting points and are usually nonconductors or semiconductors. Crystalline Solids Binding Forces in Crystals 3.Metallic crystals The metallic crystal structure consists of metal cations surrounded by a sea of delocalized valence electrons. The electrons come from the metal atoms and belong to the crystal as a whole. The freedom of these delocalized electrons to move throughout the crystal explains the high electric conductivity of metals. Crystalline Solids Binding Forces in Crystals Covalent molecular crystals The crystal structure of a covalent molecular substance consists of covalently bonded molecules held together by intermolecular forces. If the molecules are nonpolar, then there are only weak London dispersion forces between molecules. In a polar covalent molecular crystal, molecules are held together by dispersion forces, by dipole-dipole forces, and sometimes by hydrogen bonding.

13 Crystalline Solids 4.Covalent molecular crystals, continued Covalent molecular crystals have low melting points, are easily vaporized, are relatively soft, and are good insulators. Amorphous Solids The word amorphous comes from the Greek for without shape. Unlike the atoms that form crystals, the atoms that make up amorphous solids are not arranged in a regular pattern. Possible Changes of State Next CHANGE OF STATE

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