WGU D425 CHEMISTRY KEY CONCEPTS WITH
VERIFIED SOLUTIONS!!
Matter Classification - ANSWER Pure substances and mixtures
Avogadro's Number - ANSWER Number of representative particles in a mole, 6.02 X
10^23
Element - ANSWER A substance that cannot be broken down into simpler substances
Compound - ANSWER Pure substance that contains more than one element and can be
broken down into chemically simpler components
Mixture - ANSWER A physical blend of two or more pure substances where each retains
its own identity and properties in the mixture
Phases of Matter - ANSWER Solid, liquid, gas
Composition of Matter - ANSWER Atoms
Energy Transfer - ANSWER Heat and work
Motion of Energy - ANSWER Kinetic energy
Resting Energy - ANSWER Potential energy
Molecule - ANSWER A group of two or more atoms held together by chemical bonds
, Physical Changes - ANSWER Do not alter the composition of matter
Chemical Changes - ANSWER Transform matter in such a way that the identity or
chemical substance changes
Law of Conservation of Mass - ANSWER Matter can neither be created nor destroyed
Bonding Electron Pair - ANSWER Two electrons shared between atoms
Core Electrons - ANSWER Inner electrons in the core shell
Covalent Bonds - ANSWER Bond formed by the sharing of electrons between nonmetals
Valence Electrons - ANSWER Electrons in the outermost shell
Noble Gases - ANSWER The elements in Group 8A of the periodic table
Octet Rule - ANSWER An atom will be more stable when surrounded by eight electrons
in the valence shell
Ion - ANSWER An atom or molecule with a net electric charge due to the loss or gain of
one or more electrons
Base Unit Measurements - ANSWER Length, Mass, Temperature, Time, Amount of a
substance, Electric current, Luminous intensity
Ionic Bonds - ANSWER Bonds that occur between a metal and non-metal
VERIFIED SOLUTIONS!!
Matter Classification - ANSWER Pure substances and mixtures
Avogadro's Number - ANSWER Number of representative particles in a mole, 6.02 X
10^23
Element - ANSWER A substance that cannot be broken down into simpler substances
Compound - ANSWER Pure substance that contains more than one element and can be
broken down into chemically simpler components
Mixture - ANSWER A physical blend of two or more pure substances where each retains
its own identity and properties in the mixture
Phases of Matter - ANSWER Solid, liquid, gas
Composition of Matter - ANSWER Atoms
Energy Transfer - ANSWER Heat and work
Motion of Energy - ANSWER Kinetic energy
Resting Energy - ANSWER Potential energy
Molecule - ANSWER A group of two or more atoms held together by chemical bonds
, Physical Changes - ANSWER Do not alter the composition of matter
Chemical Changes - ANSWER Transform matter in such a way that the identity or
chemical substance changes
Law of Conservation of Mass - ANSWER Matter can neither be created nor destroyed
Bonding Electron Pair - ANSWER Two electrons shared between atoms
Core Electrons - ANSWER Inner electrons in the core shell
Covalent Bonds - ANSWER Bond formed by the sharing of electrons between nonmetals
Valence Electrons - ANSWER Electrons in the outermost shell
Noble Gases - ANSWER The elements in Group 8A of the periodic table
Octet Rule - ANSWER An atom will be more stable when surrounded by eight electrons
in the valence shell
Ion - ANSWER An atom or molecule with a net electric charge due to the loss or gain of
one or more electrons
Base Unit Measurements - ANSWER Length, Mass, Temperature, Time, Amount of a
substance, Electric current, Luminous intensity
Ionic Bonds - ANSWER Bonds that occur between a metal and non-metal
