Please make sure to perform any labs under the supervision of a knowledgeable adult and use all safety precautions and proper waste disposal! Be safe and have fun!
Ammonium Dichromate Volcano Lab
MUST USE CHEMICAL HOOD AND PROFESSIONAL SUPERVISION FROM A KNOWLEDGEABLE INSTRUCTOR!
Oxidation‐reduction (aka REDOX) reactions are some of the most important chemical reactions. They produce energy by the passing of one or more electrons from one species to another.
What color(s) did you see if the flame? ________________________________
What color(s) did you observe in the ash? ______________________________
What did the lava look like? ________________________________________
Questions (HINT: Ammonium Dichromate has the chemical formula, (NH4)2Cr2O7. )
What is the chemical formula or ammonium?
What is the chemical formula for dichromate?
How many nitrogen atoms are in ammonium dichromate?
How many hydrogen atoms are in ammonium dichromate?
How many chromium atoms are in ammonium dichromate?
How many oxygen atoms are in ammonium dichromate?
How many atoms altogether are there is ammonium dichromate?
Everything that goes into a reaction MUST come out the other side. Chemical equations show chemical reactions as reactants à products.
Write the full chemical equation for the reaction from group one.
Write the full chemical equation for the reaction from group two.
Write the full chemical equation for the reaction from group three.
MOLAR MASS AVOGADRO'S NUMBER
MASS <---> MOLES <---> ATOMS
1. Calculate the number of moles in 31.4 g of Fe. (HINT: The nice thing about the timeline is that we can see where we are starting (step #1), see where we are going (step #2), and find the appropriate conversion factors to get from step #1 to step #2 (step #3))
2. Calculate the number of moles in 5.0 x 108 atoms of 14C. (HINT: So, if we look at our timeline, we are starting on the right-hand side (atoms) and we want to get to the middle (moles). The conversion factor that allows us to do this is Avogadro's Number.)
3. Calculate the mass (in grams) of 1.0 x 10^32 molecules of water, H2O. (HINT: if we look at our timeline, we are starting on the right-hand side (molecules) and we want to get to the left-hand side (mass). Now, we will need two conversion factors. The first conversion factor, Avogadro's Number, will convert molecules to moles. Then we need the conversion factor between moles and mass which is molar mass.