Chemistry Lab 3 Properties of Gases

Dex Cimino 3/24/2013 CHE101, Tamburro Lab 3 Properties of Gases Data Table Experiment Results Gas Flamereaction Glowingsplint Limewaterreaction Bromothymolblue reaction Hydrogen pa annihilate brownish green Oxygen Brighter reignite redish blue Hydrogen & oxygen exothermic extinguish brownish Blue-green Carbon dioxide extinguish extinguish Milky yellow Alka Seltzer - - - - Breath None extinguish none blue I did not have any alka seltzer =/ Questions A.Give two reasons why we fill the gas generator test tubes almost to the top with chemicals? The first reason is because we want to obtain pure gas and by minimizing the amount of contrast in the top this will maximize the gases purity. Also some gases may react differently with air. Minimizing contact with air assures a better outcome. B. What happens to the zinc in the hydrogen generation experiment? It dissolved and formed hydrogen and zinc chloride. C. What happens to the manganese in the oxygen generation experiment? The manganes e seemed like a catalyst because it sped up the rate of the chemical reaction.Read this Practice Test Chem 105D. Write a balanced equation for the reaction between O2 and H2. 2H2 + O2 == 2H2O E. What is the function/ persona of the bromothymol blue in the CO2 experiment? The Bromothymol blue changed color from clue to green and then it turned yellow. After the CO2 was mixed with water, I regain carbonic acid was formed. This can measure the amount of CO2 present, a lot of CO2 will show yellow and very little or no CO2, the bromothymol will remain blue. F. Bromothymol blue is blue in the presence of basic solutions, and yellow in the presence of acidic solutions.If your solution is a soggy green, what might you assume about the solution? I would assume that the solution is neutral if it is a murky green. With acidic solution, the blue turns yellow. Flow Chart 1. assemble four test tubes with ? distilled water. 2. Add 2-3 drops of bromthymol blue to each test. give 1 Oxygen 3. Add a small amount of manganese dioxide in an avoid test tube. Then add a small amount of Hydrogen Peroxide. 4. Immediately stopper the test tube. 5. Take the stopper out. 6. Repeat these steps for Part 2 Hydrogen and Part 3 Carbon. 7. Record data and answer questions.