The table shows the concentration of a reactant in the reaction mixture over a period of time. Reactant Concentration Time Concentration 0 s 1.8 M 210 s 1.2 M 450 s 0.8 M 580 s 0.6 M 720 s 0.4 M What is the average rate of the reaction over the entire course of the reaction? (3 points) Group of answer choices 1.6 x 10−3 1.9 x 10−3 2.0 x 10−3 2.2 x 10−3

Two changes are described below. a green banana turns yellow and ripens. a layer of rust forms on an iron nail. which statement is true about the two changes? a) both are chemical changes because new substances are formed. b) both are physical changes because only the physical state of the substances change. c) a is a physical change due to a change of state, but b is a chemical change because new molecules are formed. d) a is a chemical change due to a change of state, but b is a physical change because new molecules are formed.