Properties of Gases Lab Report Example | Topics and Well Written Essays - 1750 words

Properties of Gases - Lab Report Example When the water in the pipette bulb had been completely displaced by hydrogen, the pipette was removed in an inverted position, and a thumb was placed over its opening to keep any gaseous content from escaping. A match was lit, and a small portion of the pipette content was squeezed into the flame from a distance of about 1 cm. Observations were made, and the results were recorded. The wide-neck pipette bulb was marked with a marker pen on the outside into three equal parts. The marked pipette bulb was filled with water, inverted and was set onto the gas generation tube. When about two thirds of the bulb was occupied with the produced gas, the bulb was removed while in an inverted position. The pipette bulb was set with its mouth facing down into one of the wells of the 24-well plate for later use. The test tube was disassembled and was rinsed well with water. Preparation and test for oxygen gas Few pieces of Manganese metal were placed into a second test tube. Enough of 3% Hydrogen p eroxide was added to fill the test tube almost to the top. A rubber stopper with plastic gas delivery tube through its center was inserted into the test tube, and the test tube was placed into a well of the 24-well plate. The test tube was wedged into a straight position by use of a paper tissue. The reaction was observed, and the observation was recorded. A comparison was made between the reaction in the first part of the experiment and the reaction in the second part of the experiment. Another wide-neck pipette bulb was completely filled with water. The pipette was inverted and was placed on the delivery tube of the test tube. When the water had been completely displaced by the produced gas in the collection pipette,... The paper describes the procedure of preparation and test for such gases: Hydrogen, Oxygen, carbon Dioxide, Mixture of hydrogen and oxygen. Properties of gases were used to identify various gases. Hydrogen gas, carbon dioxide gas, and oxygen gas were prepared, and their properties were investigated in this experiment. The reaction of zinc metal and dilute hydrochloric acid produced hydrogen gas which was collected by the upward delivery method, over the surface of water. Hydrogen gas produced a ‘pop’ sound when it was burned in air. Hydrogen peroxide liquid decomposed into oxygen gas and water in the presence of manganese dioxide. Oxygen gas was collected by the downward displacement of water method, over the surface of water. Gas generator test tubes were filled with chemicals almost to the top to ensure that the generated gases were not mixed with air. The ability to relight a glowing splint was the major chemical property of oxygen that was used in its identification . The mixture of hydrogen and oxygen was found to burn explosively with the formation of water vapor. The reaction between sodium bicarbonate and white vinegar produced carbon dioxide gas and water. The gas was collected by down ward delivery method because it was heavier than air. Carbon dioxide gas formed a white suspension with limewater due to the formation of insoluble calcium carbonate. Carbon dioxide gas also extinguished a burning wooden toothpick which was evident that it does not support combustion. Carbon dioxide gas also turned the green Bromothymol blue into a yellow color.

Security assignment IT Essay Example | Topics and Well Written Essays - 1500 words

Security assignment IT - Essay Example information should retain its integrity both with time as well as user at that particular instance of time. Exposure to corruption, un-monitored changes and destructions disrupt the information to a corrupted or unauthentic state. Information can be corrupted while compilation or storage but in most of the cases it happens while transmission. Availability of information is that it is available for all the users at all the times, so that it can be reached by everyone and is received in an integral form. It also takes into context the positive as well as negative users of the information. This characteristic of information makes the information usability possible only for the purposes known to the data owner. Information is not protected from observation, it can be seen by everyone but it is usable only in the ways known to the author. Information systems have a basic characteristic of identification of the information requester. A system has this characteristic when it can identify the individual user while user sends the request for the information. When the process of identification and authentication is completed, it is checked that the requesting user has the authorization to the requested context and has been provided the authorization permissions from the proper authority. As if information is not confidential, a lot of important business decisions can leak from the strategic departments of the organization, which gives an organization’s strategic information to the competition, which is hazardous to any organization for its financial as well as strategic pursuits. Privacy, authentication and authorization are to make sure the integrity, availability and security of the system. In the lack of these characteristics, information is just a collection of content, which no one knows how to access and anyone can access it without any permissions taken from the owner of the