Chemistry Vocabularies

Ø Substance             : A type of matter with a fixed composition.

Ø Element                 : If all the atoms in a substance has the same identity it becomes {blank}.

Ø Compound     : A substance in which the atoms of 2 or more elements are combined.

Ø Heterogeneous Mixture  : Mixture in which different materials can easily be distinguished.

Ø Homogeneous Mixture     : Contains 2 or more gases, liquids, or solids substances blended evenly.

Ø Solution                 : Homogeneous mixture with particles so small that they cannot be seen with a microscope.

Ø Colloid                    : Type of mixture with particles that are larger than those in solutions, but not heavy enough to settle out.

Ø Tyndall Effect      : Scattering of light by colloidal particles.

Ø Suspension   : Heterogeneous mixture containing a liquid where visible particles settle.

Ø Physical Property  : Characteristic of a material you can observe without changing the identity.

Ø Physical Change    : A change in size, shape, or state.

Ø Distillation            : A process for separating substances by evaporating a liquid and recondensing its vapor.

Ø Chemical Property : Characteristic of a substance that indicates whether it can undergo a chemical change.

Ø Chemical Change   : A change of one substance to another.

Ø Law of Conservation and Mass : The mass of all substances that are present before a chemical change equals the mass of all the substances after the change.

Ø Kinetic Theory      : Explanation of how particles in matter behave.

Ø Melting Point        : The point in temperature when the solid starts to liquefy.

Ø Heat of Fusion      : The energy required to change a substance from a solid to a liquid at its melting point.

Ø Boiling Point : The point in temperature when the liquid starts to boil.

Ø Heat of Vaporization     : Amount of energy required for a liquid to become a gas.

Ø Diffusion               : Spreading of particles throughout a given volume until they are distributed.

Ø Buoyancy               : Ability of a fluid to exert an upward force on an object immersed in it.

Ø Pressure               : Force exerted per area. (Formula)

Ø Viscosity               : The resistance to flow by a fluid.

Ø Pascal                 : Used to measure pressure.

Ø Atom                    : Element composed of one type, the {blank}.

Ø Nucleus                 : The center of a atom.

Ø Protons                 : Particles in a atom with a positive charge.

Ø Neutrons               : Particles in a atom with no charge.

Ø Electrons               : Particles in a atom with a negative charge.

Ø Quarks                  : Smaller particles in neutrons and protons.

Ø Electron Cloud       : Area around a nucleus where electrons are mostly found.

Ø Atomic Number     : Number of protons in an atom is equal to a number called {blank}.

Ø Mass Number        : This number is the sum of the number of protons and neutrons.

Ø Isotopes               : Atoms of the same element that have different numbers of neutrons.

Ø Average Atomic Mass    : Is the weighted average mass of its isotopes.

Ø Periodic Table       : A table filled with elements in order of atomic numbers, etc.

Ø Groups                  : The vertical columns in the periodic table.

Ø Electron Dot Diagram     : Uses the symbol of the element and dots to represent electrons.

Ø Periods                  : Horizontal rows of elements.