What are the two main ideas of the kinetic molecular theory of matter?
The simplest kinetic model is based on the assumptions that: (1) the gas is composed of a large number of identical molecules moving in random directions, separated by distances that are large compared with their size; (2) the molecules undergo perfectly elastic collisions (no energy loss) with each other and with the …
What does the kinetic theory explain heat is due to?
a theory that the temperature of a body is determined by the average kinetic energy of its particles and that an inflow of heat increases this energy.
What decreases as the motion of particles in a substance increases?
As the motion of particles increases, particles move further apart. The attractive forces between particles get weaker. The spaces between them increase and the particles can slip past one another.
What determines the state of matter of a substance?
The amount of energy in molecules of matter determines the state of matter. Matter can exist in one of several different states, including a gas, liquid, or solid state. A gas is a state of matter in which atoms or molecules have enough energy to move freely.
How is the kinetic energy of the constituent particles of matter affected by change in temperature?
Particles in all states of matter are in constant motion and this is very rapid at room temperature. A rise in temperature increases the kinetic energy and speed of particles; it does not weaken the forces between them. Individual particles in liquids and gases have no fixed positions and move chaotically.
How is the kinetic energy of the constituent?
How is the kinetic energy of the constituent particles of any matter affected by a change in temprature? Because the change in temperature makes some kind of pressure inside the atoms and they start to vibrate so it results to be called kinetic energy.
What happens to molecules when their kinetic energy decreases?
When the average kinetic energy of the molecules goes up (a rise in temperature), the average speed of the molecules increases. And lower average kinetic energy of the molecules means they have lower speed. The substance can experience a rise in temperature.
How can you say that one substance is different from other?
Different substances have different properties; density is one property that can be used to tell two substances apart. Density is a property that does not depend on the shape or size of an object.
Are heat and temperature the same thing?
Heat, qstart text, q, end text, is thermal energy transferred from a hotter system to a cooler system that are in contact. Temperature is a measure of the average kinetic energy of the atoms or molecules in the system.
Which factor determines the physical state of matter in which a substance exists?
Two factors determine whether a substance is a solid, a liquid, or a gas: The kinetic energies of the particles (atoms, molecules, or ions) that make up a substance. Kinetic energy tends to keep the particles moving apart. The attractive intermolecular forces between particles that tend to draw the particles together.
What are the two most important properties of matter?
Matter can be defined or described as anything that takes up space, and it is composed of miniscule particles called atoms. It must display the two properties of mass and volume.
How many physical properties of matter are there?
three physical states
What are physical properties of matter?
Physical properties are properties that can be measured or observed without changing the chemical nature of the substance. Some examples of physical properties are: color (intensive) density (intensive)
What are three physical properties of matter?
Physical properties are typically things you can detect with your senses. Examples of physical properties of matter include melting point, color, hardness, state of matter, odor, and boiling point.
What is the physical and chemical properties of matter?
A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance. Physical properties include color, density, hardness, and melting and boiling points. A chemical property describes the ability of a substance to undergo a specific chemical change.
Is density a physical property of matter?
Density is a physical property of matter that expresses a relationship of mass to volume. The more mass an object contains in a given space, the more dense it is. Density is also affected by the atomic mass of an element or compound.