The rate law for the decomposition of phosphine (PH3) is Rate= [PH3]/t = k [PH3]

It takes 140s for 1.00 M to decrease to 0.200 M. How much time is required for 2.00 M to decrease to a concentration of 0.350 M?

Which of the following is an indication that a substance has undergone a chemical change? a. no new product has been formed. b. the color of the substance has not changed. c. the original constitute has not changed. d. the molecular structure has changed.

What the blanks in these lines are ?

When hydrogen peroxide (h2o2) is added to potassium iodide (ki) solution, the hydrogen peroxide decomposes into water (h2o) and oxygen (o2). the chemical equation for the decomposition reaction is: 2h2o2—> 2h2o + o2. what is the role of the potassium iodide in this reaction? a. reactant. b. product. c. precipitate. d. catalyst.