Chem Scavenger Hunt (need help)

[1337monk]

Hello Everyone I have A Chemical Scavenger Hunt do in chem and I am having trouble figuring these out.

Ground Rules:

1. The laboratory may not be used as a source for items. You may, however, use equipment in the lab for measurement purposes. All search items are easily available and can be found in the average home. A single item may be used as the answer to several questions. Items do not have to be pure, but must verifiably contain the desired substance. NO VITAMIN TABLETS MAY BE USED

2. Label each item with its number from the hunt list. Prepare a correspondingly labeled deck of note cards with any verification measurements, calculations, formulas, equations, explanations, etc. that pertain to it (No work, No Credit, No Kidding!)

3. NO HAZARDOUS MATERIALS MAY BE USED.


SCAVENGER HUNT LIST

1. The product of an oxidation-reduction reaction. Label the sample with its correct chemical formula, its common name and chemical name.

2. A man-made polymer labeled with its correct scientific name and chemical formula.

3. 250 Calories (remember 1 Calorie = 1 food Calorie = 1000 calories). On the notecard show the calculation to determine the temperature change that would be observed when 50.0 mL of water absorbs this amount of heat.

4. A container with a mixture of gases. Label the contents with the (a) a percent by mass of each gas and (b) the relative number of molecules

5. A compound of 2 or more nonmetals. Label the compound with its formula, its chemical name, an electron dot formula and the total number of atoms per molecule.

6. A container with the compound that completes the equations (which you must balance) :

Na + ______ -----> NaOH +H2 and
C2H6 + 02 -------> CO2 + _______

Record both balanced equations on your notecard for this item. If 5.0 mol of this compound were to react completely with sodium, how many moles of hydrogen would be produced? If 1.362g of this compound were produced by burning CsH6 , how many liters of carbon dioxide would be produced at STP? (show all your calculations).

7. A Solid manufactured primarily from molten silicon dioxide among other materials Record on your note card for this item the completed phrase:

" Contains Silicon dioxide which has the formula _____ and is more commonly known as ______. The percent of oxygen by mass in the compound is ______%. "

8. A cardboard cube constructed to have the same volume of 0.10 mole of Hydrogen gas when measured at STP. Notecard with the dimensions of the cube must be attatched. Calculations required.

9. A Drawing which shows a 1500mL container with 1.730 g of nitrogen gas connected to an open arm manometer. Assume the atmospheric pressure is 743mm Hg and the temperature is 25 degrees C. Your drawing should correctly show and label the difference in height of the mercury columns on the manometer.

10. A Container with a sample of the gas which would remain left over and unreacted after 15L of nitrogen and 15L of hydrogen are combined and react to produce ammonia gas according to the equation :

N2+ 3H2 -------> 2NH3

the deltaH for this reaction is -46.19 kJ/mol of ammonia produced. Label the container with the name of the excess gas and the amount of heat that would be released if 41.59g of ammonia were produced.


11. A compound formed from an alkali and a halogen. Label the compound with its formula and name. What would be the formula of the oxide of the metal? What Group 1 element would have an ionization energy greater than this element?

12. An ionic compound which contains an element with an electron configuration ending with 3p5. What is the charge of this element's ion in the compound and how did it obtain this charge?

13. A container with a mixture of one polar compound and one nonpolar compound. On the notecard write the names of these two compounds, draw their structural formulas and label the bond angles.

14. A sample of an inert or Noble gas. Identify the gas with its name and symbol and the date it was discovered.

15. A sample of matter with radioactive 14c(albeit a minute amount of 1 in 7.8x1011 atoms). This isotope is a beta emitter. Label the sample with the decay equation.

16. A saturated solution of a compound which would yield a precipitate when added to a solution of lead(II)nitrate. If a saturated solution of this compound is 6.1M, how many liters of the solution would contain 0.6893mol of the compound?
Label the solution with the balanced net ionic equation for the reaction with lead(II) nitrate and this compound. Write the Ksp expression for the precipitate produced.

17. A compound which has an element in the 3+ oxidation state. If this element in the free state were added to dilute sulfuric acid, what would be the balanced equation for its reaction?

18. A solution with a pH less than 7. Label the solution with its name, formula, and pH. Calculate the [H+] Calculate the molarity if 23.41 mL of a similar solution were needed to neutralize 16.53mL of a 0.160M sodium hydroxide solution.

19. Two different objects with the same volumes but different densities. Show your calculations for the densities of both objects.

20. A sample of a solid that dissolves ENDOTHERMICALLY in water. Notecard must have the common name and chemical name of the substance and the balanced equation for the solution process.




Thats it. IF anyone could help me that would be great, I really need this points to keep up my grade. Thanks in Advance!

[1337monk]

i have numbers 17, 19, 14, and 7 done. so if you could help me with the others that would be great.

[Lou1024]

Theres a sticky thread for this with all the answers.
Look here:

http://www.chemicool.com/forum/viewtopic.php?t=592


EDIT: Nvm, not sure if its the same one, I thought maybe teachers handed out the same generic scavenger hunt across the country.




http://www.GenericBullshit.com

[Hix3r]

So here is what I think:

1. Fe2O3, iron(III)-oxide common name rust. I think this is quite household, just try finding some.

2. PVC, called poly-vinyl-chloride (—CH2—CH2—), surely this you will find in your house, pipes, etc. |
Cl

3. 50 mL water at normal circumstances should be 50 g. 1 calorie heats up 1 g of water by 1 °C. We have 250*1000=250000 calories and 50 grams of water 250000/50=5000, so the water will be 5000 °C warmer (I guess it would boil the hell away)

4. Take an empty container. Air is a mixture of gases. 78% nitrogen, 20.95% oxygen, 0.93% argon, 0.038% carbon dioxide, trace amounts of other gases, and a variable amount (average around 1%) of water vapor. Now this is mol/volume. Happy calculating, I don't want to do this know, cause its easy but takes time.

5. Compond of nonmetals... Geez take any plastic... anything you want... or paper, or whatever a glass of water, H2O, WATER... go search the house for alcohol, C2H5OH...

6. Oh crap, water is the solution here:
2 Na + 2 H2O ---> 2 NaOH + H2
2 C2H6 + 7 O2 ---> 4 CO2 + 6 H2O

Sodium hydrogen ratio is 2:1, so if I have 5 mol hydrogen would be 2.5 mol.
1.362 g H2O is 1.362/18 mol water (0.0757) CO2 H2O ratio is 2:3 so 2*(0.0757/3) which is 0.05 mol of CO2 at STP 24.5 L is one mol, so 0.05 mol is 0.05*24.5=1.23 L

7. You said you got this... Glass and the answers are SiO2 quartz 53.33%

8. 24.5*0.1=2.45 L so the cube is 1.35*1.35*1.35 dm.

9. Ah to hell with this this is just calculating... pV=nRT start here...

10. So beacuse it the same conditions 15L and 15L can be used as mol ratios. 5 L of nitrogen uses 15 L of hydrogen so after the reaction only nitrogen would be in the container 41.59 g of ammonia is 17/41.59=0.408 mol so 46.19*0.408= 18.88 kJ = 18880 J of heat would be released.

11. Geez... salt NaCl, oxide would be sodium-peroxide Na2O2, that would be lithium.

12. all halogens have that configuration... get some salt, cause it must be ionic... Na+Cl-...how did it obtain this.. the electronnegativity caused the electron to be found more likely around the Cl atom.

13. mixture of polar and nonpolar... great I would go with a mixture of gas(petrol) or lamp oil and water

14. you got this

15. what the hell, try finding one

16. Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2 KNO3(aq)
good calculating

17. Try iron. Fe + H2SO4 --> FeSO4 + H2

18. HCl, you certainly find some.

19. cooking oil and water

20. endothermically so it cools the water down... here KNO3, potassium-nitrate, whatever...