Unit A: Chemical Change

Lesson 2.1: Compounds and Chemical Change

Solutions are important because most chemical reactions happen in solution.  The concentration of solutes will determine the rate of reactions.  In this section you will calculate the amounts of reactants or products involved in a Chemical reaction. This lesson is a quick review of some parts of Science 10.  Look over the targets below.

  1. Recall how to balance equations
  2. Recall what a moles is.
  3. Use the coefficients from a balanced equation to setup a molar ratio
  4. Given a balanced equations and the moles of one reactant, calculate moles produced

  • Read page 58 - 60 for an overview.
  • Read page 61 - 62 and view the video below on the left to recall how to count atoms and balance equations.  Check to see that you can balance equations.  Then read page 62 and 63.  Work through the examples!  View the video below on the right.  A slight different way is used to explain and show your work.  choose the one you like best.  Do the practice problems on pages 63 and 65 and check your answers below

 

Science 20 Text.  Courtesy Alberta Education


The mole ratio is used to determine the number of moles of a product produced in a chemical reaction.  In the next investigation you will determine the number of moles of a product. You will then compare this value to the theoretical number of moles of the product determined from the equation.

  Investigation: Mole Ratios in Chemical Reactions


  • Read the entire investigation on pages 66 and 67 of the textbook.
If you have access to a supervised laboratory, do Path 1. If you do not have access to a supervised laboratory, do Path 2.

  • Follow the directions of the investigation.  Do the Prelab calculations.  Do analysis questions 6 and 7 and check below.

     

    Science 20 Text.  Courtesy Alberta Education



Use the Data in the Answers in Path 1 to Complete the analysis questions



  • Read “Using Chemistry to Preserve Artifacts” on page 68 of the textbook.

  • Read “2.1 Summary” on page 68 of the textbook. Then, complete “2.1 Questions” # 5 and 6 (7 if you need more practice) and check your answers below.

 

Science 20 Text.  Courtesy Alberta Education


Go to Assignment 2.1: Compounds and Chemical Change.