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
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 element at the beginning of a reaction will equal the mass of that element at the end of the reaction (1). Secondly, the Law of Definite Proportions states that a chemical compound always contains exactly the same proportion of elements by mass. For example, if oxygen makes up 8/9 of the mass of pure water, then hydrogen must make up the remaining 1/9 of the mass (2). We used two main substances in this lab, zinc (Zn) and hydrochloric acid (HCI). Hydrochloric acid is a clear, colorless, highly pungent compound which is composed of a hydrogen atom and a chorine atom. It is highly corrosive and is known to break down many metals including aluminum, zinc, calcium, magnesium, and iron to generate flammable hydrogen gas (3). In these reactions, a colorless gas is emitted and the metal seems to disappear. This colorless gas produced in the reaction is hydrogen gas. Zinc is a silver gray chemical element which is dense, brittle, and solid at room temperature. We have previously seen the reaction between zinc and hydrochloric acid and therefore know it bubbles and breaks down the zinc. The formula representing the reaction of the two substances is as follows: Zn + 2 HCI = ZnCl2 + H2
This equation shows the law of conservation of...
References: "The Conservation of Mass." Nature.com. Nature Publishing Group, n.d. Web. 28 Sept. 2014.
"Law of Definite Proportions." Princeton University. N.p., n.d. Web. 27 Sept. 2014.
"Hydrochloric Acid (Hydrogen Chloride)." EPA. Environmental Protection Agency, n.d. Web. 30 Sept. 2014.
Please join StudyMode to read the full document