Experiment 4 – Stoichiometry RocketsName name Lab Section 432Lab Partner: nameResults Most of the observations that could be made during the lab are mainly qualitative. Reaction A with Deionized water, 3% Hydrogen Peroxide, and .5 grams of yeast would foam up and the foam is a whitish color. Reaction B with the zinc metal and the Hydrochloric Acid would fizz like a soft drink especially around the piece of metal. Also, after a long period of time both of these reactions would start to go up. After a certain period of time the reaction with Zinc and Hydrochloric acid will start to slow down and after adding more Hydrochloric acid it for the 3rd time the reaction will still be too slowso therefore we had to get another piece of Zinc to continue. Also, when the rockets are shot you can see how fast and far that they will shoot and the force of the rockets.Ratio and Distance TableDistance 3 4 4 3Units O21 2 3 4Units H25 4 3 2Calculations1unit O2*(2molH2/1molO2)=2unitsH2 5-2=3unitsH22unitsO2*(2molH2/1molO2)=4unitsH2 4-4=0unitsH23unitH2*(1molO2/2molH2)=1.5unitO2 3-1.5=1.5unitsO22unitH2*(1molO2/2molH2)=1unitO2 4-1=3unitsO2Balanced equationsZn(s)+2HCl(aq)ZnCl2(aq)+H2(g)H2O2(l)H2O(l)+O2(g)2H2(g)+O2(g)2H2O(g)Discussion and ConclusionThe balanced equation for the combustion reaction of hydrogen and oxygen to give water is 2H2(g)+O2(g) 2H2O(g). So the ideal ratio of oxygen to hydrogen is 1:2 in this balanced equation. This experiment showed that 2:4 and 3:3 were the ratios of oxygen to hydrogen that produced the most power tosend the rocket the farthest distance which was 4. The combustion reaction between hydrogen and oxygenis an exothermic reaction and also an oxidation-reduction reaction. What is needed in a combustion reaction is a fuel and an oxidizing agent. Heat can be this energy that helps create water vapor since heat is given off to it’s surroundings by the reaction. Endothermic is when the reactants absorbs the heat from it’s surroundings which this is not the case. By understanding exothermic and endothermic, we can better understand different reactions and in this case the combustion reaction between hydrogen and oxygen. Thedata in the table does indicate that when the ratio of oxygen to hydrogen is closer to the ideal that the rocket will travel farther. 2:4 and 3:3 is closer to the ideal of 1:2 than 1:5 or 4:2. When the ratio was 1:5 or4:2 the rocket only went 3 rather than 4 so therefore when it was farther from the optimal ratio the distancethe rocket went was shorter. Some possible sources of error is that we let some of the gases leak out whichwas why we had to redo the ratios 3:3 and 4:2. That time we left a little bit of liquid to help keep the gas in. Also, that we had to replace the piece of Zinc in Reaction B because we could not add any more Hydrochloric acid to the reaction due to it being too full. We could not however just continue using the reaction as it was because it was really slow and the gas was not traveling as fast anymore. Another error for everyone is that the increments are drawn onto the pipette bulb and therefore not exactly spaced out from each other. So everyone may be slightly off with the ratios. The conclusion is that yes when the ratio of oxygen to hydrogen is closer to the 1:2 ideal, then the rocket will travel farther. This is reflected by the data collected where the closer the ratio is to the ideal, such as the 2:4 ratio and the 3:3 ratio, the farther the rocket will go which is 4. The farther the ratio is to the ideal the shorter it’ll go which is the case with the 1:5 ratio and the 4:2 ratio that only traveled 3. This reaction is so important though to where it is commonly used to fuel rockets so it is important in the real world. If we didn’t figure out this combustion reaction then we can’t fuel our rockets with it. Although we had someissues with Reaction B and also with the gas leaking out, still when we fixed these issues the results still showed that the closer the ratio is to the ideal the farther it will go. This experiment also did show how important the stoichiometric coefficients are in chemical reactions and how important the correct ratio is as well. The results will not be the same if the ratio was wrong if let’s say a rocket was being fueled with itas shown by this experiment. We were able to see how Reaction A and Reaction B were different and how different ratios with the two reactions produced different