Class Work 1/20/ Finding Molecular Formula and Percent Composition. ObjecLve
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1 ObjecLve SWBAT find the molecular formula of a compound and calculate the percent composition. Unit 6 NAME Class Work 1/20/ Finding Molecular Formula and Percent Composition SPARK 1. What is the grams formula mass of Na 2 SO 4 2. What is the empirical formula of N 2 O 4 3. A molecule has an empirical formula of CH 3. What is an example of a possible molecular formula?
2 ObjecLve SWBAT find the molecular formula of a compound and calculate the percent composition. Unit 6 NAME Class Work 1/20/ Finding Molecular Formula and Percent Composition SPARK 1. Grams formula mass of Na 2 SO 4?
3 ObjecLve SWBAT find the molecular formula of a compound and calculate the percent composition. Unit 6 NAME Class Work 1/20/ Finding Molecular Formula and Percent Composition SPARK 2. What is the empirical formula of N 2 O 4
4 ObjecLve SWBAT find the molecular formula of a compound and calculate the percent composition. Unit 6 NAME Class Work 1/20/ Finding Molecular Formula and Percent Composition SPARK 3. A molecule has an empirical formula of CH 3. What is an example of a possible molecular formula?
5 Agenda: SPARK/ObjecLve Announcements Notes PracLce Exit Ticket Homework
6 LogisLcs CaLons: Your midterm exam will be periods 2-3 on FRIDAY, January 24th (one week from today) Midterm is a Regents exam with half of the queslons cut out Today I will pass back your Unit 1 and 2 materials from my filing cabinet as well as Winter Break work These materials must come back, organized to the filling cabinet on the day of the exam. This will be worth 5% of your midterm average!
7 Grit to Greatness Award PresentaLon What is grit? Why is it important to have grit in this chemistry classroom? Why is it important to have grit in life? G2G shout outs! Grit to Greatness Award CerLficate goes to
8 Answers from (1) 2. (3) 3. (4) 4. (4) 5. (1) 6. (4) 7. (4) 8. (3) 9. (3) 10. (4) 11. (4) 12. (1) 13. (3) 14. (3)
9 Review What type of chemical formula is the one with the simplest whole number ralos? What type of chemical is the actual ralo in which atoms are combined?
10 Think about it! A student was trying to find the gram- formula mass of Mg(OH) 2. They got 41 g. What did that student do wrong? What is the correct answer?
11 What is the grams formula mass important? What if we want to find the molecular formula? Key IDEA: We can find the molecular formula from the empirical formula and the grams formula mass
12 Step- by- Step Step 1 Example 1: A compound has a molecular mass of 180 g and an empirical formula of CH 2 O. What is its molecular formula? Step 1: Determine the mass of the empirical formula.
13 Step- by- Step Step 2 Example 1: A compound has a molecular mass of 180 g and an empirical formula of CH 2 O. What is its molecular formula? Step 2: Divide the formula of the compound by the mass of the empirical formula.
14 Step- by- Step Step 3 Example 1: A compound has a molecular mass of 180 amu and an empirical formula of CH 2 O. What is its molecular formula? Step 3: MulLply the subscripts of the empirical formula by the answer you got in step 2.
15 Answer Time The molecular formula of the compound is:
16 Example #2 Example 2: What is the molecular formula of a compound that has a molecular mass of 70 amu and has an empirical formula of CH 2? Step 1: Step 2: Step 3:
17 Percent ComposiLon Percent composilon is the % mass of each element in a compound
18 Break it Down Example 1: What is the percent composilon of K and O in the compound K 2 O? Step 1: Find the grams formula mass of the compound
19 Break it Down Example 1: What is the percent composilon of K and O in the compound K 2 O? Step 2: Divide the total mass of each element by the molecular mass and then mullply by 100 to get percent composilon.
20 PracLce Example 2: What is the percent composilon of oxygen in potassium chlorate (KClO 3 )? Step 1: Find the gram formula mass of the compound (KClO 3 )
21 PracLce Example 2: What is the percent composilon of oxygen in potassium chlorate (KClO 3 )? Step 2: Find the percent composilon of oxygen by dividing the total mass of oxygen by the gram formula mass of the compound and then mul<plying by 100.
22 Your Turn Example 3: What is the percent composilon of oxygen in glucose, C 6 H 12 O 6?
23 Sample Regents QuesLon Arsenic is olen obtained by healng the ore arsenopyrite, FeAsS. The decomposilon of FeAsS is represented by the balanced equalon below. FeAsS(s) + heat è FeS(s) + As(g) Calculate the percent composilon by mass of arsenic in arsenopyrite. Your response must include both a correct numerical setup and the calculated result.
24 PracLce Time Complete your 6.2 praclce sheet for the remainder of the period!
25 Exit Ticket Complete your 6.2 Exit Ticket!
26 HOMEWORK Finish the rest of your 6.2 WS Quiz TUESDAY on Unit 6 Study for midterm by review old notes and going through old flash cards!
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