How many moles of Al2O3 are produced by the reaction 200. g Al? 4Al + 302 → 2Al2O3 3.70 mole 12. How many moles Al are required to produce 300. g Al2O3? 4Al + 302 → 2Al2O3 5.88 mole 13. 100. g Al reacts with excess O2 to produce 150. g Al2O3 according to Calculate the theoretical and percentage yield.
101 g Fe c. How many moles of Fe2O3 will react with 99.0 g of Al? ans. 1.83 mol Fe2O3 3. The reaction N2(g) + 3H2(g) ( 2NH3(g) is used to produce ammonia commercially. If 1.40 g of N2 are used in the reaction, how many grams of H2 will be needed?
| Centrifuge: used to isolate the solid from the solution | . Focus Questions: When acidified water is not used in the zinc and iodine synthesis, zinc hydroxide is formed. How can it be identified based on the amphoteric nature. When zinc and iodine react without the presence of acetic acid in the water, zinc hydroxide forms. This is evident because the substance tested positive for both the acid test and the base test for zinc hydroxide.
In well A2: Place 10 drops of Magnesium Sulfate, MgSO4 c. In well A3: Place 10 drops of Zinc Nitrate, Zn(NO3)2 d. In well A4: Place 10 drops of Iron (III) Chloride, FeCl3 e. In well A5: Place 10 drops of Copper (II) Sulfate, CuSO4 3. Take the metal solids from your LabPaq; there should be one piece each of magnesium, zinc, and iron plus two pieces of lead. NOTE: Magnesium and lead oxidize very easily and an almost invisible oxidation layer may coat the metal. To insure good reactions you should scrape the surface of those metals with a pocketknife or remove the oxidation layer by rubbing the metal pieces with steel wool or something similar. Evidence that a reaction is taking place is the formation of bubbles or a coating on the metal immersed into the solution.
Coal hypothesis = If I add activated carbon to the water it will lower the pH level of the water. 2. Based on the results of your experiment, would you reject or accept each hypothesis that you produced in question 1? Explain how you determined this. a. Pyrite hypothesis accept/reject = Based on the results of the experiment I would accept the hypothesis on pyrite.
2NaCl + H2SO4 —> Na2SO4 + 2HCl 4. If 0.380 mole of barium nitrate is allowed to react with an excess of phosphoric acid, how many moles of barium phosphate could be formed? 3Ba(NO3)2 + 2H3PO4 —> Ba3(PO4)2 + 6HNO3 5. Calculate the number of grams of carbon dioxide produced from the burning of 1.65 moles of C3H8. C3H8 + 5O2 —> 3CO2 + 4H2O 6.
LAB 5: Taking the A train Focus Question Amphoteric material can exhibit properties of a base as well as properties of an acid. In our experiment we combine Zinc and Iodine to create Zinc Hydroxide, which suppose to be Amphoteric. So in order to check if our substance is indeed amphoteric we will check its behavior when tested for Acidity and for Base. If in both case it will exhibit a positive results, we will reaffirm the assumption it is Zinc Hydroxide and amphoteric. Materials used: 2.00 Gr granule Zinc – grayish hard material, light, no smell.
Low density polyethylene (LDPE) – involves an older gas phase process (still used) with conditions: high pressure (1000-3000 times atmospheric), high temperature (300°C) and an initiator (an organic peroxide e.g. dibutyl peroxide, or oxygen). The resultant product has significant chain branching due to alkyl groups replacing hydrogen atoms on some carbon atoms. Consequently, the alkane chains cannot pack together in an orderly fashion, resulting in low densities and weak dispersion forces; therefore LDPE is soft, flexible and has a low melting point. The initiator isn’t strictly a catalyst as it is involved in the actual formation (one initiator molecule per ½ polymer molecule).
a. Pyrite hypothesis accept/reject = I would accept the hypothesis, seeing as how the pH did in face lower from 6 to 2. b. Coal hypothesis accept/reject = I would consider this hypothesis to be correct as the pH increased from 6 to 10. 3. Based on your data, what effect do you predict coal mining has on the environment? Answer = Coal mining basically removes the coal from the ground which would hinder the Earth's ability to reduce its acidity as the charcoal helps raise and ultimately balance the planet's pH.
Today, sodium bicarbonate is used in many more ways than in just cooking and in soap products/ Chemical and physical properties Sodium bicarbonate is an ionic compound with the formula of NaHCO3. Sodium has an atomic mass of 22.99amu, hydrogen has an atomic mass of 1.01amu, carbon has an atomic mass of 12.01amu, and oxygen has an atomic mass of 16.00amu. This gives a molar mass for sodium carbonate equal to 84.01grams per mol. The exact molar mass is 83.982338573g/mol. Sodium is a metal element and has a positive 1charge on its ion in the bicarbonate compound.