Which of the following are properties of ionic compounds? A. hard solids with high melting and boiling points.

B. soft and good conductors of electricity.

C. both A and B

D. good conductors of electricity, but only when dissolved in water

Answer asap need it by wednesday morning calculate the ph of 0.02m hcl best answer will be brainliest

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.

Why is it that 85.48 rounded to two significant figures is 85 and not 86?