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Warm-Up February 7, 2013

Warm-Up February 7, 2013. Write down the date and objective. Objective: SWBAT determine the percent composition of each component in a compound by completing the Percentage Composition Lab. Complete the following warm-up: What is an ion? What is an isotope?. Objective & Agenda.

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Warm-Up February 7, 2013

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  1. Warm-UpFebruary 7, 2013 • Write down the date and objective. • Objective: SWBAT determine the percent composition of each component in a compound by completing the Percentage Composition Lab. • Complete the following warm-up: • What is an ion? • What is an isotope?

  2. Objective & Agenda • Objective: SWBAT determine the percent composition of each component in a compound by completing the Percentage Composition Lab. Agenda • Review Homework • Current Event • Atom Quiz • Percent Composition Lab • % Composition • Practice Problems • Lab Report • Exit Slip

  3. Homework Review • HW 7- Atomic Structure

  4. Current Event • www.channelone.com

  5. The Atom Quiz • Silent Independence • Keep your eyes on your own paper! • NO TALKING until everyone is finished. • Keep all electronics off and away. • Raise your hand if you need something. • 30 minutes to complete.

  6. Percentage Composition Lab • In this experiment, you will determine the percentage of water in popcorn. • Follow procedures carefully • Be sure to record all data

  7. What is Percentage Composition? • The percent composition (percentage composition) of a compound is a relative measure of the mass of each different element present in the compound.

  8. Steps • To calculate the percent composition of a component in a compound: • Find the molar mass of the compound by adding up the masses of each atom in the compound using the periodic table.  • Calculate the mass due to the component in the compound you are for which you are solving by adding up the mass of these atoms.  • Divide the mass due to the component by the total molar mass of the compound and multiply by 100. 

  9. Examples • CO2 • Molar mass of compound: •   Mass due to carbon:   12.01 g/mol • Percent composition of carbon:

  10. Percent Composition Practice • For problems 1-6, calculate the percent of each element in the compound. 1. NH3 2. KMnO4 3. BaCl2 4. (NH4)2SO4 5. CH3Cl 6. C6H12O6

  11. Lab Report • Due Monday • Sections • Introduction • Purpose • Method • Brief description of procedures • Data • Data Table • Calculations • Conclusion • Analyze data (explain what the data means) • Explain what you have learned in this lab

  12. Exit SlipFebruary 7, 2013 1. What is the percent by mass of oxygen in propanol, CH3 CH2CHO? 2. In which compound is the percent by mass of oxygen the greatest? • BeO • MgO • CaO • SrO

  13. Homework • HW 8- Percent Composition Homework Due Friday • Lab Report due Monday

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