Partner(s): Unit: Stoichiometry Modeling Station: Introduction to Mole Ratios and LRs PRE-ACTIVITY DISCUSSION: You are in a new universe. This universe is called the Hardware Store. The Hardware Store consists of only 2 elements: nuts (N) and bolts (B). One nut atom (N) is one nut and one bolt atom (B) is one bolt. Like the noble gases, nut and bolt atoms are only found alone in nature (no diatomic molecules and no compounds). But under special laboratory conditions, they can, and do, react.... (Take your "molecules" apart after each step) PROCEDURE: 1. Use a balance to find the mass of 8 nuts and the mass of 5 bolts. mass of 8 nuts (N) : g mass of 5 botts (B): g 2. Attach 1 nut (N) to 1 bolt (B) to assemble a nut-bolt (NB) model. Make as many NB models as you can. Record the number of models formed, and record which material was used up. NB models produced in Step 2: Used up: 3. Attach 2 nuts (N) to one bolt (B) to assemble nut-nut-bolt (N2B) model. Make as many N2B models as you can. Record the number of models formed, and record which material was used up. N2B models produced in Step 3: ANALYSIS: Used up: 1. Write a balanced equation for the "reaction" that forms NB: 2. Write a balanced equation for the "reaction" that forms N2B : 3. What was your limiting reactant in the formation of NB, nuts (N) or bolts (B) ? 4. Was your limiting reactant the one you had fewest of? 5. What was your limiting reactant in the formation of N2B, nuts (N) or bolts (B) ? 6. Was your limiting reactant the one you had fewest of? 7. What's the difference between NB and N2B ? 8. What do subscripts tell us? 9. What do coefficients tell us? 10. Using the masses of the starting materials (the nuts and bolts) could you predict which material would be used up first? Explain. 11. How can the balanced equations help you predict which component runs out? 12. If you have 18 bolts and 26 nuts, how many NB models could you make? Show your work using dimensional analysis. 13. If you have 18 bolts and 26 nuts, how many N2 B models could you make? Show your work using dimensional analysis. 14. Similar to recipes, the balanced chemical equation allows you to predict how much of a substance is required or produced in a chemical reaction. The coefficients in a balanced chemical equation indicate the smallest whole number mole-ratio between reactants and products. a) If 3.86 moles of potassium react with 5.20 moles of water, how many moles of hydrogen would be produced? 2K+2H2O2KOH+H2