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

Since the gas in your graduated cylinder is a mixture of butane and water vapor, you must determine the partial pressure of the butane, pbutane, alone. to do this, consult a reference and record the partial pressure of the water vapor, pwater, at the temperature you recorded. use the following formula to compute the partial pressure of the butane. pbutane = atmosphere - pwater use the following combined gas law formula and compute the volume that the butane sample will occupy at stp. (hint: convert both temperatures to kelvin.) pbutane x voriginal = pstandard x vfinal troom tstandard use the following ratio and proportion formula to determine the mass of butane needed to occupy a volume of 22.4 l at stp. grams of butane you used “x” grams of butane ml of butane corrected to stp = 22,400 ml compute the theoretical molar mass of butane based on its formula and the atomic masses on the periodic table. compare your experimental results from #3 to the theoretical value of #4, computing a percent error of your findings using this formula: % error = measured value - accepted value x 100 accepted value use the following ratio and proportion formula to determine the mass of butane needed to occupy a volume of 22.4 l at stp. need asap

Given the following equation: 2a1 + 3mgcl2 --> 2alcl3 + 3mg how many moles of aluminum chloride are produced from 2.5 moles of magnesium chloride?

How do limiting factors most affect population size? ostop population growthrestrict population growthincrease population sizeresult in positive impactso