In this lesson students learn about limiting reactants, excess reactants, theoretical yield, actual yield, and percent yield.
For this lesson there is an activity in the engage section for which students need a ziploc bag filled with nuts and bolts. I use 18 nuts and 7 bolts.
To begin the lesson I have students perform an activity with their groups where they have a chance to figure out what a limiting reactant is using everyday materials.
This section is the main part of the lesson where I do notes with my students. I present the notes using the Unit 5 lecture 6 PowerPoint and students fill in the notes on their Unit 5 Lecture 6 Notes Graphic Organizer. The lesson is set up where I first explain the material and then students perform examples.
In this final section of the lesson students perform practice questions.
The questions are found on the Unit 5 lec 6 homework- limiting reactant paper.
I give students about 40 minutes of class time to start the questions so that they can get help from their partners and so that I can walk around and help them out. If students do not complete the questions in class I expect them to complete the questions for homework.
There was a typo on number 4 in the homework so that they theoretical is 0.37 grams and the actual is 2.50 grams which makes a very high percent yield. I changed the problem so that next year the actual yield with be 0.25 grams. Here is a copy of the fixed practice questions.
This is one student's filled in homework.
I check the homework for completion the following day by giving students a stamp and then go over the answers with the answer key. I make sure to take time to go over HOW to answer the questions, especially 3 and 4 which are tricky (and #4 which had the mistake).