mixtures elements and compounds Flashcards
what is an element?
it is a substance that cannot be broken down into simpler forms by physical or chemical means
what is an atom?
it is the smallest particle of an element
what is a compound
it is a substance that consists of atoms of two or more elements that are chemically joined together
importance of package labeling
the quantity
expiry date
handling of products
usage of products
disposal
storage conditions
what are intermolecular forces
forces that hold the particles together
properties of solids
definate shape
fixed volume
in-compressible
does not flow
higher density than liquid and gas
propeties of liquids
indefinate shape
fixed volume
hard to compress
flows
higher density than gas
properties of gas
indefinate shape
no fixed volume
easy to compress
flow
lower density than that of liquids and solids
what is a mixture
the combination of two substances
effects of impurities on pure substances
cause rise in temperature of boiling point
causes fall of melting point of substances
what is diffusion
the movement of particles from a highly concentrated region to a region of low concentration
what colour does hydrated copper(II)sulphate change into when heated
white
what is the colour of hydrated cobalt(II)chloride
pink
what gases does copper(II)nitrate create when heated
copper(II)oxide
nitrogen(IV)oxide
oxygen
characteristics of permanent change
the change is irriversable
new substances are formed
change in mass
heat change
