chem lab act 6 Flashcards
the temperature at which its solid form is in equilibrium with its liquid state
Melting point
usually has a sharp melting point that melts completely over a short temperature range
Pure crystalline organic substance
its melting point is influenced by the forces that hold each particle
pure substance
these are the forces that hold particles
electrostatic force and intermolecular force
the attractive or repulsive force between two electrically charged objects
electrostatic force
the force that mediates interaction between molecules
intermolecular force
the stronger the forces
the higher the melting point
bigger molecules have higher melting points compared to small molecules due to
surface area
these are fastened to a thermometer and heated in a well-stored oil bath
capillary
four classifications of chemical reactions
synthesis, decomposition, single replacement, double composition and combustion
involves the union of two or more elements or compounds to produce only one product
Direct combustion or synthesis
occurs when a single compound decomposes, generally through heating, into two or more elements or compounds
Decomposition reaction
occurs when an element, either metal or nonmetal, replaces another element in a compound producing a new compound and an element which was replaced
replacement reaction
the element that will replace the element in a single replacement reaction should be ____________________ for it to displace the element
more active
happens when two ionic compounds exchange their cation and anion parts forming at least one product that is a precipitate
double decomposition or precipitation
