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: In an [[Open System|open system]] [[mass]] can enter and leave. This may affect a [[Chemical Reaction|chemical reaction]]s taking place in that [[system]].
: In [[Open System|open system]]s the laws of [[Conservation of Energy]] and [[Conservation of Mass]] cannot be observed.
===References===
====Edexcel====
:[https://www.amazon.co.uk/gp/product/1292120215/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120215&linkCode=as2&tag=nrjc-21&linkId=8f96ddb76196848bafdb124354e4cf77 ''Open systems, page 94, GCSE Chemistry, Pearson, Edexcel '']