Chemistry - 2009-10
North Middlesex Regional High School
Online Textbook - WATER UNIT
Unit 1 - A
Unit 1 - B
Unit 1 -C
Unit 1 - D
Unit 2 - A
Unit 2 - B
Unit 2 - C
Unit 2 - D
Unit 3 - A
Unit 3 - B
Unit 3 - C
Unit 3 - D
Extra Credit - Periodic Table Games -
click "Level 1" - be able to complete level 1 anytime before the end of the course
for extra credit points which will be added toward
your final quarter grade. No more than 1 to 3 misses : +2 points; 0
misses : +4 points.
Level 2: 0 misses, +6; up to 3 misses, +4; up to 6 misses, +2. WOW!!
Computer Lab, March 12, 2010
Use the links below to help you answer questions a-i. Due on Friday, March 19.
a. In Superboy, Volume 6, how does Superboy test his hypothesis
that explains where the mercury flood came from?
b. German chemist Fritz Haber (1868-1934) won the Nobel Prize in Chemistry
in 1918 for his work on synthesizing ammonia from its elements. During the
first decade of the twentieth century, the world-wide demand for nitrogen
based fertilizers exceeded the existing supply. The largest source of the
chemicals necessary for fertilizer production was found in a huge guano
deposit (essentially sea bird droppings) that was 220 miles in length and
five feet thick, located along the coast of Chile. Haber also organized and
directed the first large scale release of chlorine gas at Ypres, France on
April 22, 1915. Although figures reported vary, somewhere between 5,000 to
15,000 Allied troops were wounded or killed that day, with loses among
German troops due to the gas, in the hundreds. Later in his career, from
1920 until 1926 Haber experimented on the recovery of gold from sea water,
his idea being to enable Germany to meet her war debts from World War 1.
(i) He also tried to produce gold by the transmutation of what element into
(ii) What does transmutation mean?
(iii) Why did Haber eventually leave Germany?
c. What % nickel is contained in the alloy NIBRO?
d. Describe an experiment that you could do to SHOW that cesium reacts with
ice even at a temperature of -116oC. Keep in mind that cesium ignites
spontaneously in air, producing a brilliant blue flame!
e. The German chemist Johann Wolfgang Dobereiner (1780-1849). noted in 1829
that the element bromine, discovered three years earlier by the French
chemist Antoine Jerome Balard (1802-1876), seemed just halfway in its
properties between chlorine and iodine. (Iodine had been discovered by
another French chemist, Bernard Courtois (1777-1838), in 1811.) Not only
did chlorine, bromine, and iodine show a smooth gradation in such
properties as color and reactivity, but the atomic weight of bromine seemed
to lie just midway between those of chlorine and iodine. Dobereiner went on
to find two other groups of three elements exhibiting neat gradations of
properties: calcium, strontium, and barium; and sulfur, selenium, and
tellurium. In both groups the atomic weight of the element in the middle
was about midway between those of the other two. Dobereiner called these
groups "triads", and searched unsuccessfully for others. The fact that
five-sixths of the known elements could not be fitted into any triad
arrangement made chemists decide that Dobereiner's findings were merely
coincidence. Name three elements in the same group and which are not
seperated by other elements that do NOT form a "triad."
f. How many grams of copper are there in a nickel?
g. How many KILOGRAMS of gold were mined from the Kennecott Denton-Rawhide
site between April 1990 and the end of 2000?
h. There is only one substance that will not turn into a solid even if you
lower the temperature down to very near absolute zero, -273 oC, at ordinary
pressures, and there is a monument to this element in Amarillo, Texas. What
is it? (no link is provided for this one)
i. In their article entitled "Examination of the contaminants and
performance of animals fed and bedded using de-inking paper sludge," (Arch
Environ Contam Toxicol 2002 May;42(4):523-8), why did Beauchamp, Boulanger,
Matte, and Saint-Laurent do the experiments in which they mixed some
de-inking paper sludge into the food that the chickens and pigs ate? (The
reason is not mentioned in the abstract; use your common sense.)
Use the following links to answer the web scavenger hunt questions. Due Friday, March 12th
1. Suppose you were building a house in Townsend for which a well needed to be dug in order to have a water supply. About how deep would you have to dig before striking water?
2. Why is there a big hole in the ground on the southeastern edge of the Prescott Penninsula at the Quabbin Reservoir?
3. Why does K.J. Nath of the All India Institute of Hygiene and Public Health think that arsenic poisoning of people living in West Bengal, India is "not so serious"?
4. What percent of Townsend, Massachusetts is covered by water?
5. What percent of people in Massachusetts obtained their drinking water from surface water sources in 1990?
6. How many gallons of water fall on a 1,000 acre town (which is slightly larger than Townsend) during a 3.0 inch rainstorm?
7. Name three of the thirteen major cities that are expected to be flooded after the completion of the Three Gorges Dam in China.
8. On what two days in 2001 were the chlorine levels in Maffitt Finished Water tests in Des Moines, Iowa slightly below the levels considered to be safe, 0.3 mg/L?
9. You put on your scuba gear, hop on a boat and head out into Dorchester Bay. Then you jump into the water and descend to the bottom, where you take out your sediment sampling instrument and start to push it into the muck, in order to measure the amount of lead contamination in different layers of sediment. If you wanted to remove a sample that would correspond to the year in which the levels of lead were the highest, how deep, in centimeters, would you have to go for your sediment sample?
10. About how many acres is the Mississippi River Delta losing to the Gulf of Mexico per year?
11. What is the name of the product that Hillside Garden and Supply in Belmont sells that comes from the Deer Island Sewedge Treatment Plant?
12. Go to http://www.dartmouth.edu/~chemlab/info/resources/qual/soluble.SolubleAppletC.html and try to solve the following puzzle: Into an empty test tube you add some 5% thioacetamide, a few drops of concentrated nitric acid, some solid sodium hydrosulfite, a few drops of silver nitrate solution, and a few drops of sodium nitrite solution. Nothing happens. Then you heat the solution and get a black precipitate. Which ingredients combined to give the black precipitate?
13. How much bigger is Antarctica in the winter than it is in the summer?
Online Lab Assignment – due Friday, Feb 5th
Go to http://www.explorelearning.com
and click on "Enroll in a class here."
On the next screen click on "New students, please click here to continue the enrollment process."
Enter the class code on the next screen -
Forensics-1 (A Period), QRAXHMMP7D; for Environmental Science (B Period), 8JPREWZLAL; for
Chemistry (D Period), YRWU7JSAAE. Enter your name and create a password; you should be on the class page.
1. Scroll down to "Solubility and Temperature," click on "Launch Gizmo."
Make two tables, one for potassium nitrate and another for salt. In each table, in one column measure how much of each solid will go into solution
at 5 different temperatures. Look at the bar chart as you add your material, click on "show numerical value" - you're trying to find maximum amount
of solid material that the water can hold before any solid starts to pile up at the bottom of the beaker, without overshooting. Try practicing at 9 degrees with
potassium nitrate, and see if you can come up with a value of 19g as the maximum amount of potassium nitrate that dissolves at that temperature.
You have to have your own 10 temperatures; copying someone else's values will get you a zero for this assignment. If you can't get this to work,
PLEASE ASK ME FOR HELP.
2. Go to Triple Beam Balance Gizmo and measure the weights of the paper clips, the cone, and the light bulb.
3. Go to the Density Laboratory. (a) Find the densities of objects 1-12 and A, B & C in g/cc. EXTRA CREDIT - find the liquid density in the big container needed for the following: (b) Crown C floats, Crown B sinks, and Crown A stays suspended. (c) Suppose you had a truckload of mixed plastics consisting of materials 2, 3, 5, 11, and 12. What density liquid could you use to isolate material 11 in pure form by getting the other four materials to float? (d) What density liquid could you use to isolate material 3 in pure form by getting the other four materials to sink?