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Physical Science Ch. 5 Review
NCKnights
32
Science
9th Grade
03/29/2009

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Term
empirical formula
Definition
the composition of a compound in terms of the relative #s and kinds of atoms in the simplest ratio
Term
molecular formula
Definition
a chem formula tht shows # & kinds of atoms in a molecule, but dont show the arr. of the atoms
Term
structural formula
Definition
shows structures of comp.s using dashes 2 rep. bonds
Term
network structure
Definition
a rep. composition where atoms are conn by bonds
Term
hydrogen bond
Definition
the attraction of a H atom 2 a neighboring molecule
Term
chemical structure
Definition
the arr of atoms in a substance
Term
proteins
Definition
organic comp tht is made of 1/more chains of amino acids & tht is a principle component of all cells
Term
chemical bond
Definition
attractive force tht holds atoms or ions 2gether
Term
metallic bond
Definition
bond formed by attraction btw pos charged metal ions and electrons around them
Term
chemical formula
Definition
tells ratio of ions in a comp
Term
bond length
Definition
dist btw 2 bonded atoms at their min potential energy , avg dist btw nuclei of 2 bonded atoms
Term
electric current
Definition
moving of charges
Term
300 deg. C
Definition
melting pt of ionic comp is often above wat temp b/c the charged ions arent free 2 move
Term
ionic bond
Definition
strongest type of bond
Term
molecules
Definition
covalent bonds make wat tht ionic bonds do not make
Term
amino acid
Definition
any 1 of 20 diff organic molecules tht contain a carboxyl and an amino group & tht combine 2 form proteins
Term
covalent bond
Definition
bond formed when 2 pairs of electrons are shared
Term
ionic bond
Definition
a bond formed by attraction btw 2opp charged ions
Term
polyatomic ions
Definition
an ion made of 2 or more atoms
Term
polar covalent bond
Definition
a bond tht results when electrons are shared unequally
Term
-ite
Definition
the ending for a polyatomic ion used 2 name the ion w/ 1 less O atom
Term
polymer
Definition
a large molecule tht is formed by more than 5 monomers or small units
Term
Hydrocarbon
Definition
a compound made of only C and H atoms
Term
alkanes
Definition
hydrocarbons tht only hav single covalent bonds whether they are 2 another C or 2 O.
Term
alkenes
Definition
hydrocarbons tht hav at least 1 double covalent bond btw C atoms
Term
alcohols
Definition
compounds made of C , H and O
Term
glucose
Definition
a sugar tht provides energy 2 living things
Term
starch
Definition
carb made of many glucose molecules tht are bonded
Term
double helix
Definition
DNA is shaped like twisted ladder called wat
Term
Covalent bond, ionic bond, metallic bond
Definition
3 major types of bonds
Term
rubber, wood cotton, wool
Definition
4 examples of nat. polymers
Term
plastics, fibers
Definition
2 ex. manmade/synthetic polymers
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