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PA STANDARD : 3.2.C.A2
Use the mole concept to determine number of particles and molar mass for elements and compounds.
Determine percent compositions, empirical formulas, and molecular formulas.
Engage How many Jolly Ranchers are there in the jar?
PART 1
Rules: You can look at the jar, but you can not open it....
So, brainstorm some ideas. What science tools and methods can be used to figure this out?
Work as a group :
PART A: How many ranchers?
1. Make a list of tools and materials to answer this.
2. Use WEB research and read about moles in the textbook to discover some ideas about CHEMISTRY moles.
3. Write an outline style procedure that you could actually use to answer this.
4. Do it....use your procedure and find the number of Jolly Ranchers.
5. Design and complete a lab procedure with results and conclusions ( Claim , Evidence, Reasoning) based on your procedure.
Please submit a hand-written report. Use the lab structure : Standard Lab Rubric
Complete Rubric for "Wholely Moley"Lab Part A
Explore :
PART B : Define the following Key Words: Each person needs to do this in their notebook...
Use the textbook, p. 172-185
1. Average Atomic Mass
2. Atomic Mass Unit
3. Avogadro's Number
4. Mole ( Chemistry mole that is...)
5. Molar Mass
6. Mass Percent
PART C: How many molecules? Each person needs to do this in their notebook....
1. We will assume that each Jolly Rancher is made of solid sugar. ( It is not, we are making it simple).
2. The sugar is sucrose.
3. Figure out how to get the number of molecules in all of the jolly ranchers in the jar. SHOW your math work.
4. Figure out the number atoms of carbon, hydrogen and oxygen found in all of the jolly ranchers in the jar. SHOW the math.
Part D: Explain : Explain how the concept of the mole and Avogadro's number can be used in chemistry. Write a paragraph in your own words that is at least six sentences. ( Each person should add this to the end of Mole Inquiry Two to be submitted.)
Part E: Elaborate: Apply these ideas and make observations in this hands-on activity : Lab 14 Submit this report separately from your Inquiry
Part F: Evaluate : Take this quiz to see if you understand the
ideas: QUIZ
PA STANDARD : 3.2.C.A2
Use the mole concept to determine number of particles and molar mass for elements and compounds.
Determine percent compositions, empirical formulas, and molecular formulas.
Part 2: Mole Wars II
Complete this in your notebook :
Part A: Explore :
Calculating Empirical Formulas:
An oxide of Aluminum is formed by the reaction of 4.151g Al with 3.692 g Oxygen. What is the Empirical Formula of the oxide? Fill in the subscripts : AlxOy
Step 1: Calculate the moles of each atom
Step 2 : Find the whole number ratio : Divide the numbers by the smallest number.
Step 3 Multiply (by 2 this time) to get a whole number for the subscripts. Write out the formula with the whole number ratios.
Find this information and be ready to share this with your partners and the class:
Part B: Explain:
1. Write the definition of Empirical formula and use the textbook p. 196 to add to
your definition of "Empirical Formula".
2. What is the molecular formula for Benzene? What is the Empirical Formula?
3. What is the Molecular Formula for Dioxin ( Tetrachlorodibezenodioxin)? What is the Empirical Formula?
4. What is the molecular formula for glucose? What is the Empirical formula?
VIDEO STUDY GUIDE : Watch this Video to see the calculation of Empirical Formulas:
This video reviews mass percent, molar mass, and shows how to calculate empirical formulas.
This section is not part of the Inquiry. Work on these when you have completed the inquiry. We will be working on these in class, and they may be required to be completed.
REVIEW : Mole Concepts
Notes will be given in class on "Mole Facts".
Evaluate : Take this quiz to see if you understand the ideas: QUIZ
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