Properties of Gases - Chem Labpaq Essay

3. Removed the test tube from the flame and places a piece of moistened litmus paper in the mouth of the test tube. Identified any odor that is readily apparent by wafted the fumes toward your nose. Caution: Do not sniff

The main objective of this experiment is to differentiate between a physical change and a chemical change.

The experiment first started by the calculation of the net oxygen production under white light, it started by putting the Elodea in a volumeter tube containing 3% sodium bicarbonate solution, which was assembled to the volumeter by covering the tube with the plug/pipet/syringe assembly (a 1-2cm air space between the bicarbonate solution and the top rubber cover of the volumeter tube should be left.) Then, clamp the volumeter onto the clamp stand using the tube clamp and fill 2000ml beaker with cold tap water. The beaker should be placed on the clamp stand between the volumeter tube and the light lamp. A five minutes stabilization

Flame test uses the differences of energy levels of an element. When the flame, from the micro burner used, excites the electrons in their ground state, the electrons absorb the energy and move to a higher energy level. Yet since the ground state is preferred, the electrons tend to move down the energy level and emit the extra energy absorbed. This type of energy is emitted through photon and wavelength, a characteristic of light. Thus, each element emits a certain type light which can be used to identify it by consulting a chart with all the documented flame test results. In Particular for this experiment, the test for ammonia and Magnesium is conducted with the addition of sodium hydroxide and the observing for the presence of the odor of ammonia for ammonia or precipitate for magnesium.

Please Note: This lab involves a lot of waiting for the gas collection. Make sure you allot yourself the full three hours to perform the experiments.

Place the test tube containing cold water in a test tube clamp and hold the test tube above the burning alcohol. Observe the outside of the test tube for evidence of product formation.

The luminous yellow flame is smoky because no air is entering the burner and hydrocarbon is converted into carbon dioxide

5.Position gas collecting hose so it runs from reaction vessel through gas collecting box to opening of the graduated cylinder. The idea is that any gas coming through the tube will rise in the graduated cylinder and displace the water in it.

A more detailed explanation of procedures can be found in the lab packet.1 To summarize, samples of benzoic acid and naphthalene were combusted using the Parr 1341 Calorimeter with a Parr oxygen bomb. A massed benzoic acid pellet was placed onto the center of the combustion pan and 10 cm of nickel alloy fuse wire was massed and then threaded through both electrodes on the head of the bomb so that it lay firmly against the acid pellet. 1mL of distilled water was then placed in the bottom of the bomb in order to ensure that all the water produced by the

XI. Inside the fume hood, add a good amount of Hydrochloric Acid, HCl(aq), to the solution in the 250 ml beaker to remove excess zinc. (accelerate reaction by heating if the reaction appears slow)

1.) Transfer the distillate to separatory funnel. Fluid didn’t seem very clear but sufficient to finish our lab on time.

After the mixture finished refluxing, the flask was then cooled on ice. A sulfuric acid solution was then prepared by pouring 4.5 mL of concentrated H2SO4 over 50 grams of ice and then diluted to 75 mL by adding enough tap water to reach 75 mL. The sulfuric acid solution was then cooled on ice.

1 ml of water should be added to the first test tube and make a note. In the second test tube, 1 ml of methyl alcohol should be added. In the third test tube, 1 ml of hexane must be added. Lastly, the fourth test tube will be a control.

8. In order confidently determine what substance my “G9R” was I would have to do over the boiling point experiment a couple of more times. I would turn the gas off and take the Bunsen burner away from the apparatus when the stream of bubbles started coming out from the mouth of the capillary tube. This would allow me to correctly determine when the atmospheric pressure was equal to the vapour pressure.

Molecular sieves adsorb the highest amount of water, produce the lowest water dew points and sweeten (remove hydrogen sulfide) and dry the natural gas.