Teacher Notes
Prepare bags of 5 bolts, 8 nuts. Can be reused from year to year.
Nuts and Bolts can be purchased by the pound at Tractor Supply.
Stoichiometry Introduction Inquiry Activity
Name________________________
Part I – Nut Bolts
1.) Examine the contents of your bag.
a. How many nuts do you have?
b. How many bolts do you have?
2.) Assemble a Nut-Bolt (NB) from a nut (N) and a bolt (B). Make as many NB’s as you can.
a. How many NB’s did you make?
b. What was used up first?
3.) Write a balanced equation for the synthesis of a Nut-Bolt (NB) from a nut (N) and a bolt (B).
a. What is ratio of N to NB? (in other words, how many nuts will it take to make a nut-bolt)
b. If you had 20 N’s and an unlimited number of nuts, how many NB’s could you make?
4.) Assemble a Nut-Bolt (N2B) from nuts (N) and a bolt (B). Make as many N2B’s as you can.
a. How many N2B’s did you make?
b. What was used up first?
5.) Write a balanced equation synthesis of a Nut-Nut-Bolt (N2B) from a nut (N) and a bolt (B).
a. What is the ratio of N to N2B?
b. What is the ratio of B to N2B?
c. If you had 20 N’s and an unlimited number of nuts, how many N 2B’s could you make?
d. If you had 20 N’s and 30 B’s, how many N2B’s could you make? What would you run out of
first?
e. If you had 20 N’s and 8 B’s, how many N2B’s could you make? What would you run out of first?
Part II – Chemistry Mole Ratios
In chemical reactions, substances react based on amount (or moles). That’s why we have been learning so
much about moles lately! Now is the time to put mole knowledge into practice. This is “real chemistry,”
people do this and get paid! It’s all about mole ratio, which is based on balanced equations.
Problem #1 – Calcium Nitrate and Aluminum Sulfate
1.) Balance the following equation:
______Ca(NO3)2 (aq) + ______Al2(SO4)3 (aq) → ______CaSO4 (s) +______ Al(NO3)3 (aq)
2.) What is the ratio of Calcium Nitrate to Aluminum Sulfate?
3.) What is the ratio of Calcium Nitrate to Calcium Sulfate?
4.) What is the ratio of Aluminum Sulfate to Calcium Sulfate?
5.) Starting with 1 mol Al2(SO4)3, how many moles of CaSO4 could you produce?
6.) Starting with 5 mol Al2(SO4)3, how many moles of CaSO4 could you produce?
7.) Starting with 4 mol Ca(NO3)2, how many moles of CaSO4 could you produce?
8.) Starting with 8 mol Ca(NO3)2, how many moles of CaSO4 could you produce?
9.) Starting with 5 mol Ca(NO3)2, how many moles of CaSO4 could you produce?
10.) Starting with 1.5 mol Ca(NO3)2, how many moles of CaSO4 could you produce?
11.) Starting with 6.02x1023 molecules of Ca(NO3)2, how many moles of CaSO4 could you produce?
(Hint: you must convert to moles first)
12.) Starting with 164g Ca(NO3)2, how many moles of CaSO4 could you produce?
13.) Starting with 328g Ca(NO3)2, how many moles of CaSO4 could you produce?
14.) Starting with 3.01x1023 molecules Ca(NO3)2, how many moles of CaSO4 could you produce?
15.) Starting with 1.0g Ca(NO3)2, how many moles of CaSO4 could you produce?