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Chemical Scavenger Hunt
Transcript of Chemical Scavenger Hunt
1. A fuel that reacts with oxygen.
Gasoline is a hydrocarbon.
Hydrocarbons react with oxygen in a combustion reaction.
19. An example of chemical energy converted to heat energy.
Gasoline is used by breaking it's chemical bonds.
In cars, gasoline is used to allow cars move by using the chemical energy in gasoline molecules and converting it into heat energy.
47. A substance that will dissolve in oil.
Gasoline is non-polar
Non-polar compounds can only be dissolved by non-polar compounds.
3. 3. A substance that acts as a reducing agent in a redox reaction.
2Al + Cu O --> Al O + 2Cu
In this reaction, Al has been oxidized and gained electrons. The substance being oxidized is the reducing agent in a redox equation.
5. A substance that is used as a barrier against corrosion
Aluminum is used on various metals to help preserve against corrosion
Without this barrier, metals will react with oxygen and begin to rust.
6. Something that would shield you from beta radiation but not gamma radiation.
Aluminum deflects beta radiation but gamma radiation has a high penetration power
Alpha radiation is the weakest, beta radiation is medium, and gamma radiation is the strongest and has the most energy
4. The mass of product that forms when 27.9g of iron reacts with oxygen.
38.4 g of Fe2O3 is produced
12.0 g O2 is used in this reaction.
23. A game that supports the law of conservation of energy by exhibiting energy transfer between objects.
Hot potato is game where you pass the potato to other people.
The potato represents the heat while each person is an object which the potato is transferred from person to person
39. A container has multiple gasses inside.
Dalton's partial pressure law allows people to find the total pressure of multiple gasses
Adding all the individual pressures of
each gas equals the total pressure.
20. Something that is made with at least two different materials.
Carbonic acid is made with water and carbon dioxide.
Water has a high specific heat while carbon dioxide has a low specific heat
43. A solution other than a solid solute in a liquid solvent,
Carbonic acid is made up of water and carbon dioxide
Water is a liquid solvent and a gaseous solute, carbon dioxide.
29. A sample that illustrates both intermolecular and intramolecular forces.
Water has both hydrogen bonds and dipole-dipole bonding.
Covalent bonds are the intramolecular forces that holds water molecules together.
33. The substance that dissolves more substance than anything else.
Water is the universal solvent.
Water is able to dissolve polar substances.
52. A substance used in cars to moderate the temperature in the engine.
Water has a high specific heat that allows it to absorb heat.
In cars, water is used to cool the engine because when the engine gets heated, the water in the engine absorbs excess heat.
2 3 2 3
9. An object where small atoms are joined to form larger atoms producing unlimited energy and requiring tremendous temperatures.
Fusion joins H atoms into He atoms.
The sun is extremely hot and allows fusion to occur. Compared to fission, fusion is impossible to occur on Earth due to the required temperature.
26. Something that undergoes a reaction with a negative enthalpy.
Negative enthalpy means that energy is released from the reactants, meaning that it is an exothermic reaction.
Fusion in the sun releases energy in the form of heat that reaches Earth.
2. A diatomic element.
Diatomic elements include H, O, N, F, Cl, Br, and I.
Diatomic elements must be paired up with another atom of the same element in a chemical equation when alone.
28. Three substances, one with hydrogen bonds, one with dipole-dipole, and one with only London dispersion.
Hydrogen bonds are between a H and O, F, or N atom. Dipole-dipole bonds are between partial negative and partial positive areas of an atom. London dispersion forces are between any atoms that is temporary.
HF, H O, and H are examples of these bonds.
41. Amount of reactant that reacts with hydrochloric acid to produce aluminum chloride and 5.0 L of hydrogen gas at STP
Using the setup, 4.0 grams of Al is needed to produce 5.0 L of H2
31. A substance that sublimates.
Solid dry ice becomes gas when it is heated.
Sublimation is when solids transform directly into a gaseous state
34. A substance that has a solid state less dense than its liquid state.
Ice floats water
Since ice floats, then the density of water is greater than the density of ice.
11. A material containing 46.67% C, 4.48% H, 31.3% N, 17.8% O.
C7H8N4O2 contains 46.67% C, 4.48% H, 31.3% N, 17.8% O.
13. Calculate the percent of Carbon in the following compound, C7H8N4O2.
C7H8N4O2 contains 46.67% C
17. The amount of salt produced by the reaction between 8.4g magnesium hydroxide and 80mL of 1.0 M sulfuric acid.
15. 0.01 moles of NaHCO3.
Molar mass of NaHCO3 is 75.02 grams.
0.01 moles of NaHCO3 is 0.839g.
50. 0.1 M solution starting with grams of substance.
45. Something that has decreasing solubility as temperature increase and pressure decrease.
Gas solubility decreases when temperature goes down.
CO2 is a gas affected by the Kinetic Molecular Theory because when gas gets heated, the motion of the atoms increase making it hard to dissolve.
48. A substance that will have a detrimental effects on the environment.
Greenhouses gasses damages the environment
Carbon dioxide is a green house gas that causes heat from the sun to be trapped within Earth's atmosphere.
17. The amount of salt produced by the reaction between 8.4g magnesium hydroxide and 80mL of 1.0 M sulfuric acid.
17.3g of MgSO4 is produced by 8.4 grams of magnesium hydroxide.
18. The amount of excess reactant remaining from the reaction in the clue above.
66g of sulfuric acid is remaining from the reaction.
60. The salt produced when magnesium hydroxide reacts with sulfuric acid.
MgOH + H2SO4 --> MgSO4 + H3O
Magnesium sulfate is the salt produced in the reaction.
There are 7.50 grams of NaHCO3 in 0.1 M solution,
51. Take your previous solution and dilute it to 0.04 M.
2.5 L are needed to dilute the solution to a concentration of 0.04 M.
7. Substance containing potassium-40.
Bananas contain potassium-40.
8. A representation of a radioactive isotope undergoing 1 half-life.
Potassium-40 undergoes beta decay in order to stabilize.
Potassium-40 loses an electron in order to become Calcium-40 which is the stable isotope of Calcium.
56. A substance used to clean the inside of metal pipes.
Potassium hydroxide is a base that cleans drains
Bases turn phenolphthalein pink, while acids turn phenolphthalein clear. Using bromothymol blue, bases turn blue while acids turn yellow. Methyl orange allows bases to turn yellow and acids to turn red
46. The solid product of the reaction between the solutions of calcium chloride and potassium carbonate.
Solid products of a reaction are precipitates that are not soluble.
CaCO3 is the solid precipitate
44. A solution containing ions.
potassium and chloride are soluble in water
K+ + Cl- + H2O is a solution that contains potassium and chloride ions.
53. A compound that is insoluble in water.
CaCO3 is a solid precipitate in water.
Precipitates are insoluble in water.
49. A substance that produces a saturated solution when 37g dissolve in 100g of water at 100*C.
Saturated solutions do not produce precipitates
NaNO3 is saturated when 37g is dissolved in water at 100*C
10. A compound with 12 moles of carbon.
sugar is made up of carbon, hydrogen and oxygen.
the formula for sugar is C12H22O11
12. A compound that is 82.8% C and 17.2% H with a molar mass of 58 grams.
58x.825/12.01 = 4 atoms of carbon. 58x.172/1.01 = 10 atoms of hydrogen.
C4H10 has 82.8% C and 17.2% H.
14. 4.57x10^26 molecules or atoms of any substance.
6.02x10^23 is Avagadro's number that shows the number of atoms in a mole.
There are 759 moles of 4.57x10^26 molecules.
55. Something that would test red on the universal indicator.
acids test red on the indicator
strong acids such as HCl have a pH of 1, meaning that it will turn clear in phenolphthalein. Compared to something with a pH of 7, the acid will have more H ions and less OH ions.
62. A concentrated weak acid that usually diluted before consumption.
citric acid is a weak acid.
weak acids do not fully separate when diluted
57. The component in a cleaning solution taht would illustrate a Bronstead Lowry base, but not a Arrhenius base.
B-L bases do not necessarily have OH but still have a pH greater than 7. They have conjugates that identify which product can act as an acid or base. Arrhenius bases have OH.
bleach, NaOCl is an Bronstead-Lowry base
58. A solution with pOH<7.
Bases has a pOH less than 7.
Bleach is a a base that has a pH of 12 and a pOH of 2.
59. A substance with OH- ion concentration < 1x10^-7.
Anything that has a OH- ion concentration less than 1x10^-7 is a base.
Lye, NaOH, is a base that has a pH of 13
63. Lye is a substance with a pH grether than 7 that is used to make soap. A 25 mL sample of lye requires 50mL of 0.5M H2SO4 to neutralize it.
It requires 1 M concentration of
lye to neutralize it.
16. The mass of the salt that can be produced from 10.0g of magnesium chloride reacting with sulfuric acid.
It produces 10.0 g of MgSO4 and has a 13% percent yield.
54. The color of the solution would be if the pressure was increased and the temperature was decreased
If the pressure is increased, then the product side will be favored. If the temperature is decreased, then the reactant side is favored.
The solution would be both green and red.
61. A substance that is produced in every neutralization reaction.
The hydrogen ion bonds with the hydroxide from the base in ored to form this molecule.
Water is always produced in a neutralization reaction,
21. The amount of energy in joules absorbed by 25.0 g of water in a calorimeter whose temperature increases by 25 degrees when a combustion of a fuel occurs.
2615 joules are absorbed by the water.
22. 15 g of this material releases 375 J of heat when the temperature changes from 42.3*C to 14.5*C.
since aluminum has a specific heat of
.900 J/gm K, which is close to .893 J/gm K,
the answer is aluminum
36. A substance that is a solid at 300 K and 720
300K = 27C, 720 mmHg = .94 atm
aluminium is solid at 300K and 720 mmHg
24.Locate a food product label that has the least amount of calories produced.
31.625 Cal in 8 grams are in doughnuts, which have 32
calories in 8 grams.
25. A product formed from the thermochemical reaction when 3 moles of methane burn in the presence of oxygen.
3CH4 + 6O2 ----> 3CO2 + 6H2O
CO2 is harmful to the environment and causes heat to be trapped in the Earth's atmosphere.
30. A substance (besides water) with at least two IMF's.
Hydrogen bonds occur between H and O, N, of F. Dipole-dipole bonds occur between any polar molecules.
HF has hydrogen bonding and dipole-dipole bonding.
32. Something that represents the shape of a water molecule.
it has two circles on top and one at the bottom.
Mickey mouse's silhouette resembles a water molecule
35. Calculate the final volume of 2.5L object heated from 5C to 30C.
2.5/278C = x/303
the final volume is 2.73 L because gasses expand when the temperature increases
37. How many moles of nitrogen gas will occupy a volume of 8.3L at 720mmHg and 27C.
0.32 mol of nitrogen gas.
38. an object that can illustrate these changes: calculate the final volume of a 2.5 L.
(1.1x2.5)/(278) = (5.3x)/303
0.57 L is the fina volume
27. Heating curve
D =339000 J
40. A container that would hold 0.0893 moles of a gas at STP
42.The mass of sodium chloride produced.