A certain first order reaction has a rate constant K= 2.75 x 10^-2 s^-1 at 20 C

a. What is the half life for this reaction?

b. If the initial concentration is 1.50 M, what will be the concentration after 6.00 minutes?

c. What is the value of the rate constant at 60 C if the activation energy is 75.0 kJ/mol?

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

can you attach the

56 moles of   lieter in chemistry

answer seismograph;