A hairdryer being used on wet hair

What is the most common reason for matter changing its state?

When did stem cell research become known ? who discovered stem cell? what experiments or studies have been conducted so far?

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.