sucture of particles Flashcards
(17 cards)
what is an element
contains only one type of atom and cannot be split by any chemical means
what is a compound
2 or more elements that are chemically combined
what is a mixture
2 or more elements NOT chemically combined
what is a pure substance
contains only 1 type of material. e.g 1 compound
or
e.g 1 element
what type of boiling point does a pure substance have
a fixed boiling point
will NOT boil over a range of temperatures
how to separate soluble solute from solvent
evaporation
tripod and evaporating basin
excess water boils off
left behind w salt
how to separate 2 immiscible liquids (don’t mix eg oil and water)
a separating funnel
how to separate liquids of different boiling points
simple distillation
liquid w smaller boiling point evaporates first
how to separate liquids with many different boiling points
fractional distillation
such as crude oil
what is a molecule
two or more atoms bonded together
what is the atomic number
number of protons
what is mass number
number of protons and neutrons
what’s an isotope
atoms of the same element with same number of protons but different number of neutrons
what is relative atomic mass definition
the ratio of the average mass of an element when compared with 1 atom of carbon12
what does the group number show
number of electrons in the outer shell
what do period numbers refer to (going down table)
how many shells of electrons there are in
what is an ion
a charged particle made from gaining/ losing an electron
