1. Welcome! (Nov 6th) Chapter 1 time!
Please have out on your desk before class:
Notes
Lab Book
Calculator
Periodic Table
Goggles

2. Okay, let’s dive in! Review in our book:
Chapter 1: Moles, Stoich, Limiting Reagent, % Yield, Empirical Formula, Percent Composition
DO NOT worry about solutions or gases yet…that’s where we are headed
Chapter 11: Sig figs, Uncertainty in Measurement

3. Moles and Molar Mass – practice 1
Classic MC problem you should expect! D

4. Moles and Molar Mass – practice 2

5. Stoich Refresher… Sugar (C6H12O6) decomposes into two products.
Write the equation:
How may grams of the product ____ will be produced if you decompose ____ g of sugar?

6. Percent Yield Do you remember the formula?
What is the percent yield of H2O if your experimental yield is ____?

7. MC Question #3 Calcium carbonate decomposes on heating as shown below.
CaCO3  CaO + CO2
When 50 g of calcium carbonate are decomposed, 7 g of calcium oxide are formed. What is the percentage yield of calcium oxide?
A. 7%
B. 25%
C. 50%
D. 75% B

8. MC Question #4 D

9. Empirical Formulae – MC #5D

10. Empirical Formulae
Simplest whole-number ratio of elements in a compound
Sugar’s molecular formula = C6H12O6
Empirical Formula = ?
How do scientists figure it out?

11. MC Question #6 The percentage by mass of the elements in a compound is
C = 72%, H = 12%, O = 16%.
What is the mole ratio of C:H in the empirical formula of this compound?
A. 1 : 1
B. 1 : 2
C. 1 : 6
D. 6 : 1 B

12. Lab 5 – Empirical Formula of CuxIy
Pre-lab and understanding the procedure first
DANGEROUS: Iodine is NOT good to breathe, so all in fume hood!
Analytical balance – even finger oil can mess up your results! BE CAREFUL

13. Homework Day 1 Lab 5 Post-Lab finished for next class
WS 1- good review problems
More next class!