Matter Flashacrds Flashcards
Substance
A type of matter with a fixed composition.
Element
When all atoms in a substance have the same identity.
Compound
A substance in which the atoms of two or more elements are combined in a fixed proportion.
Heterogeneous Mixture
A mixture in which different materials can be distinguished easily.
Homogeneous Mixture
Contains two or more gaseous, liquid, or solid substances blended evenly throughout.
Solution
A homogeneous Mixture of particles so small that they cannot be seen with a microscope and will never settle in the bottom of their container.
Colloid
A type of mixture with particles that are larger than those in the solution.
Tyndall effect
Scattering of light by colloidal particles.
Suspension
When a heterogeneous Mixture containing a liquid in which visible particles settle.
Physical Property
Any characteristic of a material that you can observe without changing the identity of the substances that make up the material.
Physical Change
A change in size, shape, or state of matter.
Distillation
The process for separating substances in a mixture by evaporating liquid and recondensing its vapor.
Chemical Property
A characteristic of a substance that indicates whether it can undergo a certain chemical change.
Chemical Change
A change of one substance to another.
Law of Conservation of Mass
Matter is not created, nor destroyed during a chemical change.
Kinetic Theory
An explanation of how particles in matter behave.
Melting Point
The temperature in which a solid begins to liquefy.
Heat of Fusion
The amount of energy required to change a substance from the solid phase to the liquid phase.
Boiling Point
The temperature at which the pressure of the vapor in the liquid is equal to the external pressure acting on the surface of a liquid.
Heat of Vaporization
The amount of energy required for the liquid at its boiling point to become a gas.
Diffusion
The spreading of particles throughout a given volume until they are uniformly distributed.
Plasma
Matter consisting of positively and negatively charged particles.
Thermal Expansion
AN increase in the size of a substance when the temperature is increased.
Buoyancy
The ability of a fluid or liquid or a gas to exert an upward force on the object’s weight.
Pressure
Force exerted per unit area.
Viscosity
The resistance to flow by a fluid.
Pascal
The unit pressure is measured in.
