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elements compound and mixtures - Coggle Diagram
elements compound and mixtures
elements
all substances which are composed of
only one atom
are called an element
elements are the building blocks of matter
there are 177 known elements
about 92 of them occur naturally on earth
they are displayed on the periodic table
elements can exist as a single atom
they are called monatomic elements
or molecules of elements
each element has its own unique physical properties
hence, we can use the following methods to identify an element
melting point
boiling point
density
elements can be classified as
metals
non-metals
metalloids
compounds
when different elements combine together chemically
they form a compund
the formation of a compound requires a chemical reaction
energy change is usually involved
either giving out or taking in
a compound has its own physical and chemical properties
the properties are different from its constituents elements
a compound is made up of atoms if different elements chemically combines in a fixed ratio
the constituent elements in a compound
have a fixed proportion by mass
when 2 elements
a metal and a non-metal
combines together to form a compound
the name of the compounds ends with '-ide'
each compound has its own unique physical properties
hence we can use the following physical properties to identify a compound
melting point
boiling point
density