A Balanced Chemical Equation by Experiment Essay Example for Free

A Balanced Chemical Equation by Experiment Essay Introduction The purpose is to use the mole relationships to prove the validity of the balanced chemical equation and that the final product of the experiment would confirm the balanced equation. The hypothesis made is that the experiment would in fact confirm the balanced equation. This is because, by balancing the equation two products that do exist are hypothetically formed. By the end of this experiment it will be seen whether the products calcium carbonate and sodium chloride will be made upon mixing calcium chloride and sodium carbonate together. The dependent variables are the amount and the chemical composition of the product formed and the independent variables are the individual amounts of deionized water, calcium chloride and sodium carbonate. Therefore, if calcium chloride and sodium carbonate are mixed together, then the reaction will produce calcium carbonate salt and sodium chloride. Materials * Stirring rod * Electronic balance * Fine filter paper * Deionized water * 2 small beakers * Sodium carbonate * Erlenmeyer flask * Graduated cylinder * Calcium chloride * Safety glasses * Funnel Procedure 1. The groups name was marked in pencil on the rim of the filter paper. 2. The mass of the filter paper was measured and recorded. 3. A clean dry small beaker was put on the electronic balance and was tarred. 2.138 grams of sodium carbonate crystals were added and the exact mass was recorded. 4. A different beaker was then put on the electronic balance and was tarred. 1.040 grams of calcium chloride was added to and the exact mass was recorded. 5. Approximately 25 mL of deionized water was added separately to each of the beakers. Each beaker was stirred with different ends of a stir rod until the solids were dissolved. 6. The calcium chloride solution was poured into the sodium carbonate solution. 7. The funnel was rested in a tall Erlenmeyer flask and the liquid was poured through into the filter paper which lined the inside of the funnel. This collected the solid. 8. Two separate 10 mL quantities of deionized water was poured through the filter paper. 9. The beakers and stir rods were cleaned and returned to their appropriate places. 10. When dried, the mass of the filter paper and soil was measured and recorded and discarded into the garbage. Results Quantitative Results Na2CO3 2.138 grams CaCl2 1.040 grams Final Substance (Na2CO3 + CaCl2 ) 2.125 grams Filter Paper Qualitative Results Na2CO3 * When mixed with water, foam appeared at the side and the surface of the solution * There was also a white flaky substance that formed CaCl2 * When mixed with water, the solution fogged up with foamy substance at the sides of the solution * Tiny bubble like substance also formed at the side Final Substance (Na2CO3 + CaCl2 ) * When the two substances mixed together, a white powdery precipitate was formed. * The flakes of powder were easily broken down. Calculations Conclusion The initial hypothesis stated can now be proved correct as after completing the experiment, the statement, which stated that the experiment would prove the balanced chemical equation true. As in the balanced equation CaCO3 was formed, this is in fact calcium carbonate, which is the salt that was produced. It is known that a chemical reaction took place because a precipitate was formed, one of the indications of a chemical equation. Also, this is a double displacement reaction. The information given by coefficients in a balanced equation can be understood to represent the relative number of molecules of that substance and as the relative number of moles involved in the reaction. Equations must be balanced because: Law of Conservation of Matter: Atoms can be neither created nor destroyed in an ordinary chemical reaction, so there must be the same number of atoms on both sides of the equation. The mass of all the reactants (the substances going into a reaction) must equal the mass of the products (the substances produced by the reaction). By using the percent yield, the success of the experiment can be determined. The higher the number of the percent yield (closer to 100%) is an indication that the experiment was more successful. The percent yield of this experiment is 99.68% 100.32%, which indicates that the reaction was successful, but the change of 0.32% is also to be noted. This change may have been caused because of incorrect mass data. Possible errors that could have occurred involve an inaccurate measure in mass of the final substance. When pouring the calcium chloride into the sodium carbonate, there was a residue left in the beaker that held the calcium chloride therefore not all of the substance was poured into the sodium carbonate. This also occurred when the final solution was poured through the filter paper. This would have led to a change in the mass data of the initial products to produce the insoluble calcium carbonate salt. Another error that could have occurred includes the fact that the product produced was kept overnight exposed to dust particles which may have mixed with the product and changed the mass data or the chemical composition of it. Also, there may have been impurities within the instruments used to perform the experiment. As other classes also use the same instruments, it can be determined how well they were cleaned and what chemical residue may have been left on the instruments. Modifications to the procedure of this lab that can lead to fewer errors include and more reliable results would be to check the utensils used for the experiment very well and to clean them with a cleaning agent to cancel out the possibilities of chemical residues left on them. Also, leaving the filter paper with the product in an airtight container or other vessel that would allow for steady temperatures and not let any substances in or out of the vessel.

What it means to be an American Essay -- Patriotism United States Amer

What does it mean to be an American? The soil of the middle-east stained with the blood of our American soldiers just so we can not take advantage of our right to vote. Though sometimes questionable, America's overall image portrayed to other countries is an honorable one. America is known for its democracy and as well as being a land of opportunities and many freedoms. America's assortment of ethnicities and cultures is proof that our country is a desirable one. Wars are being fought at this very moment to defend these freedoms. There are many battles that have dictated what America is and stands for today. Some of these battles were literal fights and others were ones of a societal nature. For example, The Civil War was a pivotal battle in American history that freed African-Americans from slavery which was led and won politically by Abraham Lincoln. Following this was Dr. Martin Luther King?s work which led to the end of segregation also against African-Americans. Currently, America is fighting a war on terrorism against several countries. America?s origin will truly tell why ...

Human Resource Management Essay

1. What do you think is causing some of the problems in the bank’s home office and branches? ANSWER: Attrition or employee turnover was high during past eight years, as a result supervisors tried to find a suitable employee to replace the worker who had quit. We know that employee turnover is very costly especially in lower paying job roles, for which the employee turnover rate is highest. There was no standardization of recruitment process in organization. Absence of effective communication process is also apparent because all branch office hired employees without communicating with their home office. Bank’s local supervisor failed to train their employees properly. They didn’t spend much time for their employees. A rigorous performance evaluation system wasn’t also in place. 2. Do you think setting up an HR unit in the main office would help? ANSWER: Of course I think it would. Since there are HR-related problems both in the home office and in the branches, it is clear that if an HR office were set up, it would help coordinate the HR activities in the branches more effectively. 3. What specific functions HR units carry out? What HR functions would then be carried out by supervisors and other line managers? What role should the internet play in the new HR organization? ANSWER: Core functions of HR unit  should be recruitment, training and development, employee relations, compensation and benefits, performance evaluation etc. Core functions of supervisors and other line managers would consist of: day-to-day people management managing operational efficiency providing technical expertise allocating work monitoring work and checking quality Measuring operational performance. HR may use the Internet to reach candidates and communicate with them, to create and use an up-to-date employee database, measure the employee’ abilities, communicate with them, train them and monitor them

The Origins Of The Oldest Civilization - 1233 Words

The oldest civilization was in Mesopotamia between two rivers. Mesopotamia means â€Å"the land between the rivers.† Hence the name, Mesopotamia is found in the Fertile Crescent between the Tigris and the Euphrates Rivers, which is now known as Iraq. Since the land was very fertile in Mesopotamia, the crops grew incredibly well and that helped lead to the development of civilizations. Mesopotamia had eight civilizations: Sumer, Akkad, Babylon, Hittites, Assyria, New Babylon, Phoenicians, and Israel. Sumer lasted from 3200 b.c. until 1900 b.c. Sumer was ruled by a king who had the responsibility of maintaining the city walls and the irrigation systems. Once the king passes, his power is then passed down to the next eligible son in the family which is known as hereditary rule. Sumer was a Theocracy, meaning that the religious leaders were in charge of the government and ruling system. The officials or ruler of Sumer kept records, led armies into war, enforced laws, and collect ed taxes. 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