The best replacement for chemical is physical change.

The best alternatives to chemical are rated as following:
★★★★★  physical change
★★★★  physical properties
★★  mechanical digestion
★★  mechanical weathering
★★  physical sunscreen
★★  physical
★★  mechanical engineering
★  physical property
★  organic fertilizer
★  physical reactions
★  physical weathering
★  petroleum engineering
★  biomedical engineering
★  physical reaction
★  electrical synapse
★  physical changes
  steam carpet cleaning
  natural fertilizers
  natural fertilizer
  organic fertilizers
  physical sunscreens
  mineral sunscreen
  biological
  nuclear reaction
  electrical synapses
  physical sunblock
  clastic sedimentary rocks
  physical adsorption
  steam cleaning carpets
  organic farming

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Google Trends

Scale is based on the average worldwide traffic of chemical in all years. Click on graph for more.
chemical
physical change
physical properties