1. which of the following is an example of a physical change to matter?
a. rusting
b. digestion
c. freezing
2. which of the following is an example of a chemical change?
a. melting a stick of butter
b. dissolving salt in water
c. using magnesium to displace hydrogen gas from water

Consider the reaction of a(g) + b(g) + c(g) => d(g) for which the following data were obtained: experiment initial [a], mol/l initial [b], mol/l initial [c], mol/l initial rate, mol/l.s 1 0.0500 0.0500 0.0100 6.25 x 10^-3 2 0.100 0.0500 0.0100 2.50 x 10^-2 3 0.100 0.100 0.0100 1.00 x 10^-1 4 0.0500 0.0500 0.0200 6.25 x 10^-3 what is the rate law for the reaction?

Why is the melting of ice a physical change ?

What is the oxidation state of each individual carbon atom in c2o42−?