1) Which has the highest concentration? a) A b) D 2) Which has the highest concentration? a) F b) G 3) Which has the highest concentration? a) B b) C 4) Which has the highest concentration? a) C b) D 5) Which has the highest concentration? a) A b) B 6) Which has the highest concentration? a) F b) I 7) Which has the highest concentration? a) E b) F 8) Which has the highest concentration? a) B b) D 9) Which has the highest concentration? a) B b) C 10) Which has the highest concentration? a) G b) H

Concentration differences/gradients

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