During a lab, we take the initial volume of water in a graduated cylinder to be 23.4 ml. After adding a screw to the water, it then raises to 27.6 ml. If the mass of the screw was found to be 7.1 grams- what would the density of the screw to be in g/ml? A) 3.89
B) 29.8
C) 3.40
D) 1.7

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.