U1.1: Intro to the particulate nature of matter Flashcards
Define Atom
Smallest particle of an element
What is matter?
Anything that takes up space
Define what a pure substance is
It has definite and constant composition - it will look and remain the same
Define an Element
A substance that can’t be broken down by chemical means into simpler substances
Define a Molecule
2 or more elements that are chemically joined together
Define a Compound
2 or more elements chemically joined together in a fixed ratio
Define a Mixture
Contains more than 1 element or compound in no fixed ratio which are not chemically bonded and so can be separated by physical methods
Define a homogeneous mixture
They are the same mixtures throughout hence, they will have a uniform composition
Define a heterogeneous mixture
They have a different mixture throughout hence, they will have visibly different substances or phases throughout and therefore, a non-uniform composition
Define a Chemical Formula
Uses a combination of chemical symbols of its constituent elements
What separation technique is used to separate components of a mixture
Paper Chromatography
What separation technique is used to separate a mixture of liquids according to their boiling points
Distillation
What separation technique is used to separate mixtures according to their solubility
Filtration
What separation technique is used to separate compounds according to different, high boiling points
Fractional Distillation
What separation technique is used to separate and remove impurities that are mixed in with a solid
Recrystallisation
