(a modified student lab activity derived from the Introductory Physical Science Text (5th ed.)
Purpose: This lab activity will have three objectives. First, we will determine the ratio of zinc to zinc chloride formed when zinc is made to react chemically with HCl. Second, we will measure the temperature of the water to determine the amount of heat absorbed or released during the course of this chemical reaction. Last, we will attempt to capture and identify the gas created as a product of this chemical reaction. Independent variable: Reacting the zinc and hydrochloric acid. Dependent variable: The result of the hydrochloric acid and zinc.
I hypothesize that the ratio of zinc(reactant) …show more content…
2. What does this ratio have to do with the Law of Conservation of Matter?
It shows that the zinc metal, which was one of the reactants, got bonded with chlorine, and they made the zinc chloride.
3.Was energy gained or lost by this chemical reaction? Gained 4.What is the correct term for this energy transfer?
5.What is the correct term for the transfer of energy in the splint test of the captured gas? Exergonic
6.What do you think is the name of the gas that was captured? Hydrogen
7.What reason do you have for identifying this gas? I know it was hydrogen because of the demonstration that we had done during class with splitting the hydrogen from water and we put it in a test tube and did the splint test exactly like what was done in this experiment, and there was an identical result.
8.Does the chemical reaction that occurred involve ionic bonding or covalent bonding? Ionic bonding Why?(how do you know this?) I know this because the zinc atom loses an electron, making it have a positive charge, while the chlorine atom gains an electron, making it have negative charge. Those opposite charges attract each other to make an ionic