CHEMISTRY

2012-13Semester 2

2/14/13

• Entry Task

• Calculate the calories if 100 grams of water is heated 5 degrees Celsius.

• How many Calories is that?

2/19/13

• Entry Task

• Free Day!

2/20/13

• Entry Task

• How does a calorimeter work? Explain your answer in terms of calories, Calories, and temperature of the water before and after burning.

• Conduct our lab!! Everyone fill out the data sheet.

2/21/13

• Entry Task

• Identify and explain how and where thermal energy is being transferred in your calorimeter. Explain your answer in terms of convection, conduction, radiation, absorption, and reflection.

• http://science.yourdictionary.com

2/22/13

• Entry Task

• Say Something Nice• Please turn in your entry task papers!!

2/25/13

• Entry Task

• What is the boiling point of a substance? Use water as an example.

• Review and turn in thermodynamics lab. • Read pages 265-267. Answer questions 14-18

on page 267.

2/26/13

• Entry Task

• Look at the graphs on page 269. What happens to the temperature while ice is melting or water is boiling?

• Read pages 267 to 270. Answer questions 19-22 on page 270.

2/27/13

• Entry Task

• How do scientific ideas change over time? What influences the ideas?

Discuss Answers

• Scientists make predictions, conduct tests and share their results.

• Some of the predictions have evidence to be correct and others have evidence to be incorrect.

• Other scientists consider the results and conduct other tests and share those results.

• Over a long number of years, the knowledge grows and changes.

Take Notes!

• You will be making a timeline from the information in this movie.

• NOTES: – WHO - people, – WHAT - contributions to scientific ideas AND political

issues/ gender constraints of the era– WHERE - country where they conducted their work, – WHEN - YEAR(s) of effort– WHY – why was this discovery important?

2/28/13

• Entry Task

• What is a TIMELINE?

Discuss Answers

• A timeline is a graphic representation of the passage of time as a line. Either vertical like facebook or horizontal…

• EXAMPLE• http://1.bp.blogspot.com/-

zr2Mh-uoWfg/T6BQf69mDLI/AAAAAAAACmk/l_QQlVJ-sis/s1600/Timeline_Inventions.jpg

• Often, past on the left…current on the right. • Remember the spaces on the timeline should be even.

For example if you want to span 200 years over 10 inches, every inch would be 20 years.

3/1/13

• Entry Task

• Say Something Nice• Please turn in your entry task sheets!

3/4/13

• Entry Task

• List THREE interesting people and their discoveries from the movie last week.

Today’s Work

• Complete movie.• Discuss notes.• Set up timeline. • Complete your timeline with your partner.

– 1812 – Michael Faraday, electricity/magnetism, London, only gentleman are scientists– 1885 Einstein as a child– 1771 – Antoine Lavoisier, France, Conservation of Mass, French Revolution, he gets

guillotine—disliked tax collector– 1897 Einstein in high school, poor student, fascinated by light– 1846 – Faraday realizes electricity and magnetism are connected, invents electric

motor, names the “invisible light” electromagnetism– 1722- Emilie du Chatalay, France, before her time, translated Newton’s principia and

realized he had made an error, velocity should be squared, fell in love with poet Voltaire, died at 43

– 1905 – Einstein’s miracle year, Germany, 5 papers, including E=mc2 in 3 pages – 1919 – Fame finds Einstein and he divorces Mileva, marries cousin– 1907 – Berlin, Germany; Lisa Meitner becomes first professor (1912)of physics– 1920-30 “Golden Age of Nuclear Research”– 1930’s – Nazis drive out Jewish intellectuals; Einstein leaves in 1933; Meitner barely

escapes in 1938– 1938 – Sweden, Robert Frisch (nephew) and Meitner “split the atom” realizing that

lost mass is converted directly to energy during nuclear fission– 1942 Manhattan Project in US; bombs contain only a couple pounds of Uranium and

Plutonium

Gaps in your Notes

• http://www.pbs.org/wgbh/nova/physics/ancestors-einstein.html

• TIMELINE SCALE:• 1 inch = 20 years• ½ inch = 10 years• ¼ inch = 5 years• TIMESPAN: 1722-1942

3/5/13

• Entry Task

• Give a detailed example of how society influences science and technology and vice versa.

• Finish movie• Add detail and color to timelines

3/6/13

• Entry Task

• How did Einstein’s big ideas build on Faraday, Maxwell, Lavoisier and du Chatelier/Leibnitz?

• Also, where do you think physics and chemistry crossover?

3/7/13

• Entry Task

• Based on what you know of kinetic energy of molecules, will cold water or warm water have more dissolved oxygen?

Today’s Work

• We will test the dissolved oxygen content in tap water OR fishtank water (your choice!)

• Follow the instructions in the test kit. – Natosha – materials supervisor and reader of test

instructions– Krista – data recorder– Justin and Briana - technicians

• Put everything away for TOMORROW!

3/11/13

• Entry Task

• What does pH tell you about the fluid?• Find an answer in the textbook!

Today’s Work

• Complete a pH test. • Complete two more oxygen replicates• SET UP – 3 testing places at back tables for 7th

graders to do pH, nitrate and turbidity tests.• If time, complete a nitrate test and turbidity

test.

Answers

• pH stands strength of hydrogen. • Numbers closer to 14 mean more BASIC or

alkaline. • Numbers closer to 0 mean more ACIDIC. • Acid is between 0 and 6.9• Neutral 7• Basic is between 7.1 and 14.

3/12/13

• Entry Task

• What is happening when we add 8 drops of Manganous Sulfate Solution and 8 drops of Alkaline Potassium Iodide to the water sample?

• Read http://bit.ly/16ozZNS • Finish DO test. • Conduct turbidity, nitrate and pH tests.

3/13/13

• Entry Task

• What does the turbidity test tell you about our river water?

• Read and discuss packet on water quality parameters. • To Turn in: for each of the parameters (DO, BOD, pH,

turbidity and nitrates) discuss IN WRITING the apparent health of our river by comparing it to the optimal values given in the text.

• WATCH MOVIE!!

3/14/13• Entry Task• In the dissolved oxygen test, what chemistry is happening when

the solution turns from yellow to clear? • ANSWER: The thiosulfate molecule then reacts with any

I2 present.

• 2S2O32- + I2 = 2S4O 6

2- + 2 I-

• When the iodine (I2) molecules react, they break up into I- ions which are colorless.

• How does this help us know how many O2 molecules there are?• ANSWER: tells us that 4 molecules of the Sodium Thiosulfate

are required to change the color resulting from one molecule of O2 in the original water

Today’s Work

• One person – complete 3rd and 4th DO test• One person – complete BOD tests (3 trials)• One person – calculate averages and compile

the data onto the master sheet. • THIS DATA IS DUE TO THE Chehalis Basin

Education Consortium TODAY!!!

3/15/13

• Entry Task

• Say Something Nice• Please turn in your entry task sheets!

Today’s Work

• Find master data sheet on CBEC website• Transfer all data and averages to master sheet• Complete the essay:

ESSAY about our river data…

• For each of the parameters (DO, pH, turbidity and nitrates) discuss IN WRITING the apparent health of our river by comparing it to the optimal values given in the text.

• Explain how much higher or lower it is than optimal.

• Explain whether you think this is a good thing, bad thing, or just fine.

• Check with Ms. Maring when you think you’re done.

3/18/13

• Entry Task

• What do you know about balancing chemical equations?

• Is this equation balanced?• 2Na + H2O 2NaOH + H2

Today’s Work

• Read pages 207-210.• Answer #13 or 14 Questions on page 211. • Practice balancing equations at• http://education.jlab.org/elementbalancing/

3/18/13

• Entry Task