Look at the table. What word completes label 2 for the right hand column? Enter your answer (1) (2) Examples Separation Composition Joined or not? concrete, air, sea water each substance within it is separated easily variable - you can vary the amount of each substance in it the different substances (3)_ chemically joined water, carbon dioxide, sodium chloride only separated using chemical reactions definite - you can't vary the amount of each element in it the different elements (4) chemically joined C​