istry ▁are ▁distinct . ▁Physics ▁is ▁concerned ▁with ▁nature ▁from ▁a ▁very ▁large ▁scale ▁( the ▁entire ▁universe ) ▁down ▁to ▁a ▁very ▁small ▁scale ▁( sub atomic ▁particles ). ▁All ▁physical ▁phen omena ▁that ▁are ▁meas urable ▁follow ▁some ▁behavior ▁that ▁is ▁in ▁accord ance ▁with ▁the ▁most ▁basic ▁principles ▁studied ▁in ▁physics . ▁ ▁Physics ▁is ▁involved ▁with ▁the ▁fundamental ▁principles ▁of ▁physical ▁phen omena ▁and ▁the ▁basic ▁forces ▁of ▁nature , ▁and ▁also ▁gives ▁insight ▁into ▁the ▁aspects ▁of ▁space ▁and ▁time . ▁Physics ▁also ▁de als ▁with ▁the ▁basic ▁principles ▁that ▁explain ▁matter ▁and ▁energy , ▁and ▁may ▁study ▁aspects ▁of ▁atomic ▁matter ▁by ▁following ▁concepts ▁derived ▁from ▁the ▁most ▁fundamental ▁principles . ▁ ▁Chem istry ▁focus es ▁on ▁how ▁subst ances ▁interact ▁with ▁each ▁other ▁and ▁with ▁energy ▁( for ▁example ▁heat ▁and ▁light ). ▁The ▁study ▁of ▁change ▁of ▁matter ▁( chem ical ▁re actions ) ▁and ▁synth esis ▁lies ▁at ▁the ▁heart ▁of ▁chem istry , ▁and ▁gives ▁rise ▁to ▁concepts ▁such ▁as ▁organ ic ▁functional ▁groups ▁and ▁rate ▁laws ▁for ▁chemical ▁re actions . ▁Chem istry ▁also ▁studies ▁the ▁properties ▁of ▁matter ▁at ▁a ▁larger ▁scale ▁( for ▁example , ▁ast ro chem istry ) ▁and ▁the ▁re actions ▁of ▁matter ▁at ▁a ▁larger ▁scale ▁( for ▁example , ▁technical ▁chem istry ), ▁but ▁typically , ▁explan ations ▁and ▁predictions ▁are ▁related ▁back ▁to ▁the ▁underlying ▁atomic ▁structure , ▁giving ▁more ▁emphas is ▁on ▁the ▁methods ▁for ▁the ▁identification ▁of ▁mole cules ▁and ▁their ▁mechan