Science - Chemistry
Standard 4 Objective 1
1 class periods of 60 minutes each
Students will bake a cake, brownies, cookies etc. This will be used to introduce chemical reactions and writing balanced equations.
Put the students in groups the previous class and have them divvy up the materials they will need to bring.
They can cook their "cake" in a crucible on the Bunsen burner. Almost everyone brings their materials because others in their group are counting on them.
This requires about two twenty minute increments of time with a ten minute introduction during one class period (my students did an activity to study for their final between this lab). Take fifteen minutes the previous class to give the students planning time.
Have some hot pads to get the pans out of the oven.
This is meant to be an introductory lab so no prior knowledge is required.
#1. List your reactants. What was your product? Write your chemical reaction. Explain that this will look something like 2C flour + 2 tsp water ⃗ Double fudge cake.
#2. If there are the same number of atoms before and after a chemical reaction (the heat of the oven), then why does the cake weigh less than the mixture of all the ingredients? The next day after the lab, explain that some of the atoms leave the cake as they are heated (evaporation etc.). But if the reaction took place inside a closed container the mass would be the same before and after.
#3. Name the catalyst(s) of the experiment. Talk about catalysts and have the students write the definition of a catalyst: something that speeds up a reaction but is not consumed in the reaction.
#4. List all the signs you can think of that showed that a chemical reaction took place.
Give the students points for making a "product" and for finishing the lab write up.
Lesson Design by Jordan School District Teachers and Staff.