This ones a little long but it’s asking to say what each letter on the graph represents? pls help?

State one important difference between a physical change and a chemical change?

Which states of matter have particles that move independently of one another with very little attraction?

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.