Conservation Of Mass Lab
Conservation of Mass Lab
Author: Aubrey Bryant
Team Members: Elianna Chavez, Berkley BresemannDate of Experiment:
Date Report Submitted: September 30, 2014
Instructor: Josh GeisingerClass: Chemistry
Purpose:
The purpose of this experiment was to use the Law of Conservation of Mass and the Law of Definite Proportions to determine the quantity of zinc chloride that is produced in a chemical change from a given amount of zinc.
Background:
We used two important laws of chemistry in this lab. Firstly, the Law of Conservation of Mass states that matter is neither created nor destroyed during a chemical reaction and the mass of a system should therefore remain constant during any chemical process. In other words, the mass of any one …show more content…
Because this compound occurs in fixed proportions, for every one zinc atom, there are two chlorine atoms. The following formula can be used to determine the percentage of the mass of zinc chloride in zinc:
Mass of ZnMass of ZnCl2×100%=% mass of Zn (1)
The percentage of mass of zinc in ZnCl2 was then discovered by inserting the atomic massed of zinc and zinc chloride, which can be found on the periodic table, into formula 1.
65.39 amu65.39 amu+235.453 amu×100%=47.89% Zn According to these calculations, zinc should theoretically make up approximately 48% of the mass of ZnCl2.
In order to observe the law of conservation of mass and the law of definite proportions at work in this lab, we mixed zinc and hydrochloric acid, then we boiled the mixture to remove excess liquid which produced the compound zinc chloride. By altering formula 1, we predicted the amount of zinc chloride …show more content…
Next, we measured and recorded the mass of our flask and then zeroed the scale. We then obtained a sample of zinc from our instructor and added it to the flask. Afterward, we measured and recorded the mass of the zinc and the flask. We calculated the mass of the zinc by subtracting the mass of the flask and the zinc from the mass of the flask by itself. Making sure it was between 0.8g and 1.15g. We carefully measured 10mL of 4M hydrochloric acid (HCI) in our graduated cylinder. This we then poured into the to the flask and recorded our observations such as sight and smells. We then set aside the flask and waited five days for the reaction to complete. When we returned to the flask after the five days, we made and recorded observations about the reactions which had taken place. We turned on our hot plate and set it to 275o C. We set the flask on the hot plate and waited for the liquid to begin to boil. We recorded our observations throughout this step until the liquid had completely evaporated. After the flask cooled down, we observed and measured the mass of the flask and its contents on a zeroed balance. We then recorded this data and cleaned the flask with
Author: Aubrey Bryant
Team Members: Elianna Chavez, Berkley BresemannDate of Experiment:
Date Report Submitted: September 30, 2014
Instructor: Josh GeisingerClass: Chemistry
Purpose:
The purpose of this experiment was to use the Law of Conservation of Mass and the Law of Definite Proportions to determine the quantity of zinc chloride that is produced in a chemical change from a given amount of zinc.
Background:
We used two important laws of chemistry in this lab. Firstly, the Law of Conservation of Mass states that matter is neither created nor destroyed during a chemical reaction and the mass of a system should therefore remain constant during any chemical process. In other words, the mass of any one …show more content…
Because this compound occurs in fixed proportions, for every one zinc atom, there are two chlorine atoms. The following formula can be used to determine the percentage of the mass of zinc chloride in zinc:
Mass of ZnMass of ZnCl2×100%=% mass of Zn (1)
The percentage of mass of zinc in ZnCl2 was then discovered by inserting the atomic massed of zinc and zinc chloride, which can be found on the periodic table, into formula 1.
65.39 amu65.39 amu+235.453 amu×100%=47.89% Zn According to these calculations, zinc should theoretically make up approximately 48% of the mass of ZnCl2.
In order to observe the law of conservation of mass and the law of definite proportions at work in this lab, we mixed zinc and hydrochloric acid, then we boiled the mixture to remove excess liquid which produced the compound zinc chloride. By altering formula 1, we predicted the amount of zinc chloride …show more content…
Next, we measured and recorded the mass of our flask and then zeroed the scale. We then obtained a sample of zinc from our instructor and added it to the flask. Afterward, we measured and recorded the mass of the zinc and the flask. We calculated the mass of the zinc by subtracting the mass of the flask and the zinc from the mass of the flask by itself. Making sure it was between 0.8g and 1.15g. We carefully measured 10mL of 4M hydrochloric acid (HCI) in our graduated cylinder. This we then poured into the to the flask and recorded our observations such as sight and smells. We then set aside the flask and waited five days for the reaction to complete. When we returned to the flask after the five days, we made and recorded observations about the reactions which had taken place. We turned on our hot plate and set it to 275o C. We set the flask on the hot plate and waited for the liquid to begin to boil. We recorded our observations throughout this step until the liquid had completely evaporated. After the flask cooled down, we observed and measured the mass of the flask and its contents on a zeroed balance. We then recorded this data and cleaned the flask with