The elephant toothpaste demonstration was a great example of the use of potassium iodide as "catalyst". why did dr. hartings use potassium iodide in this demonstration?

to slow down the reaction

to speed up the reaction

to preserve the oxygen in the soap bubbles

to give color to the foam

ammonia is one of the most produced chemical compounds in the world today. which of the following is the main real-world use for ammonia? *

2 points

to maintain the level of of nitrogen in the air (78%)

to produce household cleaners

to produce nitric acid

to produce fertilizer for crops

Lab reagent, hypothesis test.a reference solution used as a lab reagent is purported to have a concentration of 5 mg/dl. six samples are taken from this solution and the following concentrations are recorded: (5.32, 4.88, 5.10, 4.73, 5.15, 4.75) mg/dl.these six measurements are assumed to be an srs of all possible measurements from solution.they are also assumed to have a standard deviation of 0.2, a normal distributin, and a mean concentration equal to the true concentration of the solution.carry out a significance test to determine whether these six measurements provide reliable evidence that the true concentration of the solution is actually not 5 mg/dl.