Which sentence correctly sequences the underlined verbs? we will not receive the final pieces that we needed to complete the collection. we will not receive the final pieces that we had needed to complete the collection. we have not received the final pieces that we will need to complete the collection.

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.