Question | Answer |
2 or more substances combined, but not chemically joined | mixtures |
mixtures can be organized by ... | ordinary ways |
each substance in a mixture keeps ... | its own properties |
2 or more elements that are chemically joined (stuck together) | compounds |
compounds must have ... | different properties than the substances that make them up |
compounds must have bonds broken in order to ... | separate the elements |
a certain compound always has the same ...(ex. sodium chloride is NaCl) | chemical formula |
some compounds exist as ... | molecules |
a molecule is ... | when atoms join by sharing electrons with eachother, they join in ratios |
what can show how atoms in a compound are connected? | a sketch |
bond length | the distance between the nuclei of two bonded atoms/the angle formed by 2 bonds to the same atom |
does the structure of a compound affect the properties of the compound? | yes |
strong structures are made of ... | bonded ions |
high or low melting point?-compounds made of bonded ions have ( ) melting points ex.-salt | high |
there are 2 main types of bond's between atoms, and which type it is depends on ... | its electonegativity |
how much an atom attracts electrons in a bond | electron electonegativity |
one atom steals electrons from another atom | ionic bond |
opposites ( ) and ( ) together. | attract, stick |
what do ionic compounds conduct when they are melted or dissolved in water? | electricity |
ionic compounds stick together in ( ) not as ( ) molecules. they always ( ) eachothers charges. | networks, individual, balance |
ionic compounds have very ( ) melting points | high |
two atoms share electrons is called | covalent bonds |
atoms may share (2 words) of electrons or ( ) than one pair of electrons. | one pair, more |
O=O is a... | double covalent bond (it shares 4 electrons) |
H-H is a ... | single covalent bond |
a triple covalent bond shows ( ) lines | 3, it shares 6 electrons |
atoms may ( ) we call these polar covalent bonds. | not share electrons equally |
some covalent bonds have a ( ) or a ( ) charge. these are called ( ) | positive, negative, poly atomic ions |
covalent compounds have ( ) melting points than ionic compounds do. | lower |
we dont hear much about this bond | metallic bond |
( ) bond is similar yet different from the main 2 types of bond we just talked about(ionic and covalent) | metallic |
a bond formed by positively charged metal ions in an "ocean" or "soup" of electrons | metallic bond |
what can slide around in the "soup" of electrons from one nucleus to the next? | ions |
this type of bonding allows metals to conduct ( ) well. | electricity |
long molecules made of many smaller molecules bonded together. the smaller molecules that make them up are called monomers.(ex.- cotton, wool, rubber, plastics, DNA) | polymers |