Flyne Anderson Experiment done – 30 September 2012 Report submitted – 02 October 2012 Chemistry 111 – Experiment 4 : Properties of Gasses Purpose: The purpose of the experiment is to learn about the properties of gasses, and identify them by their physical and chemical properties by combining different elements and observing how they react with each other, and outside in? uences. Materials/Procedure: I gathered my materials from the material list and set up my data table. I combined the zinc and HCl, then captured the Hydrogen that was produced and observed the combustion reaction with a ? me. I then captured more hydrogen to use later in the experiment. I combined manganese with hydrogen peroxide which bubbled much the same as the zinc and HCl to produce oxygen. I observed the reaction of the oxygen with a burning ember. I then captured more oxygen in the bulb with the hydrogen, and observed it? s reaction of extinguishing the ? ame. I then produced carbon dioxide in a few different ways. Put lime water in a well, mixed baking soda and vinegar, and observed the limewater turning murky and grey, an indication of CO2.
Then did the same with a well of bromothymol blue which indicated an acid. I exposed this gas to a ? ame and the ? ame extinguished immediately. I then combined alka-seltzer and water, and inserted the gas into the lime water again. I then tested the CO2 from my breath with the lime water. Data Table: Gas Hydrogen Flame reaction Loud pop and ? ame extinguished Glowing splint Limewater reaction Bromothmol blue reaction X burst of red ember Oxygen X X X X X Data Table: Hydrogen & Oxygen loud pop and ? ame extinguished no reaction, ? ame went out
Carbon dioxide X X X bubbling, turned murky grey, formed CO2 X bubbled, turned black/ green, then after a bit started sucking yellowish substance up into tube Alka Seltzer X X vigorously bubbled, water turned murky, then lime water turned very clear after a long period of time it gets very murky X Breath X X Questions: X In lab questions: 1G. Observations: the mossy zinc formed bubbles on the surface. 2B. Observations: much the same as the zinc and HCl, the combination of Mn and H2O2 formed bubbles on the surface of the metal. 4Part1E.
The Ca(OH)2 in the lime water reacts with CO2 to form what I believe is the white precipitate calcium carbonate. 4Part 3F. It means the reaction of the Alka Seltzer and water forms CO2, which reacts with the lime water again to make the water murky. 4Part 5C. We exhale CO2, and exhaling into the straw emits CO2 and reacts to limewater, and again gets murky/grey. A. Give two reasons why we ? ll the gas generator test tubes almost to the top with chemicals. We would want to ? ll the gas generator almost to the top with chemicals to obtain pure gases.
By reducing the amount of air in the top you will maximize the purity of the gases, and some gases might react with air to produce something else instead of the intended outcome. And maximizing the amount of reactants will again aide in having a pure reaction. B. What happens to the zinc in the hydrogen generation experiment? The zinc dissolves and forms hydrogen and zinc chloride. C. What happens to the manganese in the oxygen generation experiment? Nothing, the manganese is a catalyst and does not change. D. Write a balanced equation for the reaction between O2 and H2? H2 + O2 —> 2H2O E. What is the function/purpose of the bromothymol blue in the CO2 experiment? Bromothymol blue does not react with basic solutions but turns yellow in the presence of acidic solutions. This is to identify if the reaction of Vinegar and Baking soda produces an acid or a base. And since the reaction produces CO2, and CO2 is an acid, the bromothymol blue turning yellow in the gas tube indicates the gas is an acid. F. Bromothymol blue is blue in the presence of basic solutions, and yellow in the presence of acidic solutions.
If your solution is a murky green, what might you assume about the solution? If bromothymol blue turned murky green in the presence of a solution, it would indicate the pH of the solution was neutral. Conclusion: I learned to identify gases by their physical and chemical properties. By combining elements and observing their reactions. It was interesting to see invisible gases being produced, and then reacting to things I can see with my eyes. Using my own breath as one of the products was great! It gave me a better grasp of these chemicals/compound that we usually don? t see.