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(also called or polypropylene) colourless transparent thermoplastic used where a flexible material is required.
this consists of three separate layers of the Earth â the crust, the mantle and the core.
a diagram that shows the electrons in the outermost occupied shell of an atom as dots or crosses...
a solution to which a little acid has been added to a lot of water.
the difference between the energy absorbed to break bonds and the energy transferred to the...
substances such as elements or compounds, that cannot be broken down into simpler substances by...