Most of the concrete used in the construction of buildings, roads, dams, and bridges is made From Portland cement, a substance obtained by pulverizing the hard, granular residue (clinker) from the roasting of a mixture of clay and limestone and adding other materials to modify the setting properties of the cement and the
The charge to a Portland cement rotary kiln contains 17% of a dried building clay
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- The %purity of a powdered crude sample of Na2CO3 containing only inert impurities is to be determined by reacting 225.0 mg of the crude sample to 10.0 mL of 3.00 M HCl solution, and bubbling the resulting CO2(g) product in water that is at exactly 29 °C. After the reaction has completed, the level of the liquid inside the eudiometer rests 4.30 cm above the water level in the beaker. The graduation on the eudiometer indicates that the trapped gas is 44.37 mL. The experiment was done under a barometric pressure of 755.2 torr. a. How many moles of CO2 were collected? b. What is the percent purity of the sample? Round off to the nearest whole numberarrow_forwardYou are using 115% PPA and after a couple of minutes in the boiling water bath, you observe a distinct amber color in your flask. After your benchmate assembles their flask in the same water bath, you notice that your flask has become a cloudy white. Your benchmate's flask remains clear and changes to amber at a time comparable to others using 105% PPA. Your flask remains white for the duration of the heating process. What might have happened to your reaction? What evidencce supports your assumption? How would you expect it to affect your results, and why?arrow_forwardTungsten is extracted from the mineral scheelite (CaWO4) by roasting it with natrite (Na2CO3) at a temperature of about 700 °C. This converts the CaWO4 to water soluble sodium tungstate (NazWO4). The solid product from the roaster (called "calcine") is transferred to a leacher. In the leacher chilled water is added to dissolve the NazWO4. The chilled water dissolves only the NazWO4 in the solid calcine. The scheelite that enters the roast is mixed with gypsum (CaSO4-2H2O). This stream is 85.2%w CaWO4 and 14.8%w CaSO4-2H2O. (%w means “percent-by-weight.") Four reactions take place during this process. In the roaster: 1: CaWO4 + Na2CO3 - NazWO4 + CaO + CO2 2: CaSO4•2H2O - CaSO4 + 2H2O In the leacher: 3: СаО + H2О —- Са(ОН)2 4: CaSO4 + 2H2O - CaSO4 2H2O The first reaction does not go to completion, all the other reactions do go to completion. For the conditions shown in the process diagram on the next page calculate the conversion of the CaWO4 in the roaster.arrow_forward
- The %purity of a powdered crude sample of Na2CO3 containing only inert impurities is to be determined by reacting 225.0 mg of the crude sample to 10.0 mL of 3.00 M HCl solution, and bubbling the resulting CO2(g) product in water that is at exactly 29 °C. After the reaction has completed, the level of the liquid inside the eudiometer rests 4.30 cm above the water level in the beaker. The graduation on the eudiometer indicates that the trapped gas is 44.37 mL. The experiment was done under a barometric pressure of 755.2 torr. Determine the %purity of the sample.arrow_forward50.00 mL of a solution containing 0.15 M CH2 (CO2 H)2 and 0.020 M MnSO4·H2O Calculate the mass of manganous sulfate monohydrate required (manganese sulfate is available only in the monohydrate form, MnSO4H2O, which means that within every MnSO4 unit cell, there is one water molecule present; the mass of the water must therefore be included in the calculation).arrow_forwardFeS can be roasted in O2 to form FeO:2FeS + 3O2 → 2FeO + 2SO2 If the slag (solid product) contains 80% FeO and 20% FeS, and the exit gas is 100% SO2, determine the extent of reaction and the initial number of moles of FeS. Use 100 g or 100 lbas the basis.arrow_forward
- Describe, with using necessary diagrams, the structure and/or microstructure of the following materials and justify their applications based on their properties. Plain carbon steel (0.25% C), as used to make a body panel for a car Duraluminum 2024: as used to make aircraft structures High density polyethylene (HDPE), as used to make non-carbonated drinks containers Silicon carbide, as used in ball type flow control valves Carbon fibre reinforced polymer (CFRP), as used in the construction of high-end automobile racingarrow_forwardUse the following atomic masses (in g/mol):Mg = 24.31; O = 16; Ca = 40.08; C = 12.01; Na = 23; H = 1; N = 14.01; S = 32.06; Cl = 35.45; 2.) Limestone consists chiefly of mineral calcite (CaCO3). The carbonate content of 0.5413g of powdered limestone was measured by suspending the powder in water, adding 10mL of 1.392M HCl and heating to dissolve the solid and expel CO2. The excess acid required 39.96mL of 0.1004M NaOH for complete titration to a phenolphthalein end point. Find the % wt of calcite in limestone.arrow_forward24 mwt (N204) = 92 g/mol 50.0 g of N2O4 is introduced into an evacuated 2.00 L vessel and allowed to come to equilibrium with its decomposition product, N;O4(g) → 2NO:(8). For this reaction Ke = 0.133. Once the system has reached equilibrium, 5.00 g of NO, is injected into the vessel, and the system is allowed to equilibrate once again. Calculate the mass of NO, in the final equilibrium mixture. A. 17.8 g В. 12.4 в С. 14.7 в D. 19.7 g E. 15.5 g O AA O B. B O D. D O EEarrow_forward
- 1. Railroad tracks made of 1025 steel are to be laid during the time of year when the temperature averages 10°C (50°F). If a joint space of 4.6 mm (0.180 in.) is allowed between the standard 11.9-m- (39-ft-) long rails, (a) what is the hottest possible temperature that can be tolerated without the introduction of thermal stresses? (b) If these tracks were going to be laid in the Australian Outback and see temperatures of 150 °F, what would the stress be?arrow_forwardIII.) Calculate Vmax and Km · S (mol·1") v, mol·l"-min 4.10 x 10° 1.77 x 10 9.50 x 10* 1.73 x 10* 5.20 x 10* 1.25 x 10* 1.06 x 10* 1.03 x 10* 4.90 x 10 8.00 x 10* 1.06 x 10* 6.70 x 10 5.10 x 10° 4.30 x 10* -6arrow_forward1. Which of the following compounds can form hydrogen bonds with water?a. octaneb. HClc. NaCld. acetic acid2. Maria wants to determine the percent water content of an unknown hydrate of AB. Given the following data:mass of empty crucible - 12. 2784gmass of AB · xH20 + crucible - 17.4960gmass of AB + crucible - 15.1314gCalculate the % water content of the hydrate3. From the above data, give the correct formula for the hydrate. (AB₂ Molar mass = 129.84 g/mol)arrow_forward
- Chemistry: Principles and ReactionsChemistryISBN:9781305079373Author:William L. Masterton, Cecile N. HurleyPublisher:Cengage Learning
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