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science 8th grade
review
15
Science
8th Grade
04/03/2013

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Term
valence electrons
Definition
those electrons that have the highet energy level  and are geld most loosely
Term
electron dot diagram
Definition
represents the number or valence electrons of an atom.  it includes the symbol for the element surrounded by dots.each dot stands for one valence electron.
Term
ionic bond
Definition
the force or attraction between two positive and negative ions. they are formed as a result of the attraction.
Term
ionic compound
Definition
a compound that consist of positive and negative ions
Term
covalent bonds
Definition
the chemical bond formed when two atoms share electrons
Term
molecular compound
Definition
a compound that is composed of molecules
Term
chemical equation
Definition
is a short easy way to show a chemical reaction
Term
conservation of matter
Definition
mass stays the same in this chemical reaction
Term
three types of chemical reactions
Definition
synthesis decomposition replacement
Term
what are the physical properties of metals?
Definition
luster, malleability, ductility, and conductivity
Term
thermal conductivity
Definition
the ability of an object to transfer heat
Term
electical coductivity
Definition
the ability to transfer electric current
Term
what are the four classes of organic compounds required by living things ?
Definition
carbohydrates, protein, lipuds, nucleic acids
Term
what is a carbohydrate?
Definition
an energy rich organic comund made of ekements carbon, hydrogen and oxygen
Term
what is glucose?
Definition

sugar found in your body

 

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