Chemistry 202 Dr. Don DeCoste 367J Noyes Lab [email protected] 11am-12pm Mondays and
Wednesdays (after lecture) 10-11 am Tuesdays and 1-2 pm
Thursdays By appointment; open door policy
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Lon-Capa
1st HW assignment due Friday, 9/4, 5 pm. It is open now.
1st Quiz due Sunday, 9/6 by 10 pm. It will open Wednesday, 9/2 at 5 pm.
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Chemistry Learning Center
230 Davenport Hall Chemistry TAs available from 9 am –
5pm Mondays – Fridays. Chemistry 202 TAs in the CLC:
Mondays: 11am-1pm, 3pm-5pm Wednesdays: 3pm-5pm Thursdays: 3pm-5pm
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For Monday Continue working on Lon-Capa. Finish reading Chapter 3 and doing
the Chapter 3 homework (Challenge Problems!).
Start reading Chapter 4 and doing the Chapter 4 homework.
See me or email me if there are any questions or concerns.
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Chemical Reaction
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Clicker Question
Balance the following equation and determine the sum of the coefficients:
C2H5OH + O2 → CO2 + H2O
A) 4B) 5C) 8D) 9E) 10 6
Limiting Reactant Concept
Hydrogen (H2) and nitrogen (N2) react to form ammonia (NH3).
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Make Sure You Can Do This…
500.0 g of hydrogen gas and 500.0 g of oxygen gas are reacted to form water.
Determine the mass of water produced (563.0 g) and the mass of excess reactant left over (437.0g H2).
Prove mass has been conserved.(500.0 g + 500.0 g = 563.0 g + 437.0 g)
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A Complex ProblemBaking soda (sodium bicarbonate) decomposes upon heating to form sodium carbonate, water vapor, and carbon dioxide. Sodium carbonate does not decompose further at this temperature.
You have a 10.00 g mixture of baking soda and sodium carbonate and heat it until completion. After heating you are left with 8.97 g of solid.
Determine the mass percent of baking soda in the original mixture.
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Problem Solving: A Journey Where Are We Going?: What are we
trying to solve? What does this mean? Where Have We Been?: What do we
know? What is given in the problem, and what is our knowledge base?
How Do We Get There?: How do we connect what we know to what we are trying to solve?
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Office Hours: My Contribution
Yes you can. What are you looking for? OK, write that down … So what does
this mean? OK, write that down. OK, write that down. OK … Sure, no problem at all.
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