SCH4U - Chemistry 12 (2024-25) - A

SCH4U-25A

*3-3F: Hess's Law Lab [5%]

This page is part of the content downloaded from *3-3F: Hess's Law Lab [5%] on Monday, 3 March 2025, 9:20 AM. Note that some content and any files larger than 50 MB are not downloaded.

Description

Overall Expectations & Learning Goals

  1. I am demonstrating scientific investigation skills (related to both inquiry and research) in the four areas of skills (initiating and planning, performing and recording, analysing and interpreting, and communicating). (A1.) 

  1. I am analysing technologies and chemical processes that are based on energy changes, and evaluating them in terms of their efficiency and their effects on the environment (D1.) 

  1. I am investigating and analysing energy changes and rates of reaction in physical and chemical processes, and solving related problems. (D2.) 

  1. I am demonstrating an understanding of energy changes and rates of reaction. (D3.) 

Success Criteria:

  1. I can use appropriate terminology related to energy changes and rates of reaction, including, but not limited to: enthalpy, activation energy, endothermic, exothermic, potential energy, and specific heat capacity [C] 

  1. I can solve problems involving analysis of heat transfer in a chemical reaction from experimental data, using both the Q and Enthalpy Change equations together.  [K, T/I] 

  1. I can conduct an inquiry to calculate, using a calorimeter, the heat of reaction of a substance (e.g., the heat of solution of ammonium nitrate, or of combustion of a hydrocarbon), compare the actual heat of reaction to the theoretical value, and suggest sources of experimental error [K, T/I] 

  1. I can calculate energy changes in a chemical reaction from experimental data, using Hess’s law [K, T/I] 

  1. I can conduct an inquiry to test Hess’s law (e.g., measure heats of reaction from the combustion of magnesium, and combine them to yield the ΔH value of the reaction) [T/I] 

  1. I can calculate the heat of reaction for a formation reaction, using a table of standard enthalpies of formation and applying Hess’s law [T/I] 

  1. I can explain how mass, heat capacity, and change in temperature of a substance determine the amount of heat gained or lost by the substance [K, A} 

  1. I can state Hess’s law, and explain, using examples, how it is applied to find the enthalpy changes of a reaction [K, A] 

   

Instructions:

In this assignment you will use Calorimetry, Standard Enthalpies of Formation, and Hess’s Law to calculate the enthalpy change for the combustion of magnesium.  You will then use your knowledge of thermodynamics to answer questions related to your calculations. Please ensure that you have reviewed the learning activities for 3-3 before attempting this lab. 

 

Task 

Step 1: Download the Assignment 

 

Step 2: Complete the Hess’s Law Lab  

  • Read the introduction to the lab.  

  • Open the virtual lab here: Rosedale Academy Virtual Lab

  • Follow the instructions and procedure for the lab as outlined in the virtual lab and the procedure.  

 

Step 3: Complete the Analysis and Apply your Understanding Questions 

  • Answer all of the questions on the assignment sheet. Show your work.  

 

Step 4: Submit your Lab 

  • Submit your complete lab as a pdf file. Make sure to include your name on any pages you submit. 

 

Submission Requirements 

  • Submit your lab as a pdf file.