11. A material safety data sheet (MSDS) for a chemical is shown below. MSDS H3PO4(aq) Section 9: Physical and Chemical Properties Physical state and appearance: Viscous liquid Odor: Odorless Color: Clear, colorless Boiling point: 158°C Melting point: 21°C Specific gravity: 1.685 at 25°C Which of these is the appropriate name for H3PO4 (aq)? A. Trihydrogen phosphite B. Phosphoric acid C. Phosphorous hydroxide D. Phosphorous acid
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- 6 Methods that employ separation of the product chemically through precipitation, with purification, drying and weighing of the resultant product: A. Spectrophotometric analysisB. Volumetric analysisC. Gravimetric analysisD. Gasometric analysis7 Phase changes involving fusion, except:a. Solid to liquidb. Liquid to solidc. Gas to liquidd. Gas to solidNitroglycerine ( C3H5N3O9) is a very strong explosive that degrades over time and is too shock sensitive to transport safely. Dynamite is made by combining nitroglycerine with stabilizers and adsorbents, which makes it much safer to use. The explosion of nitroglycerin can be represented by: 4C3H5N3O9(l)→6N2(g)+12CO(g)+10H2O(g)+7O2(g) A stick of 40% dynamite is about 20 cm long and about 3 cm in diameter and weighs 203 grams. It is 40.0% nitroglycerine by mass. What is the total number of moles of gas produced when a stick of 40% dynamite explodes?A multiple effect evaporator has a capacity to process 10000 kg of solid caustic soda per day, when it is concentrating from 3% to 40% solids. The water evaporated in kg per day is _________________
- A mixture of ethanol (ethyl alcohol) and water contains 40.0% water by mass.(a) Assuming volume additivity of the components, estimate the specific gravity of themixture at 20°C. What volume (in liters) of this mixture is required to provide 150 mol ofethanol?(b) Repeat Part (a) with the additional information that the specific gravity of the mixture at20°C is 0.89045 (making it unnecessary to assume volume additivity). What percentage errorresults from the volume-additivity assumption?10.11/ A 1.5-kg specimen of a 90 wt% Pb-10 wt% Sn alloy is heated to 250°C (480°F), at which temperature it is entirely an a-phase solid solution . The alloy is to be melted to the extent that 50% of the speci- men is liquid, the remainder being the a phase. This may be accomplished either by heating the alloy or changing its composi- tion while holding the temperature con- stant. (a) To what temperature must the speci- men be heated? (b) How much tin must be added to the 1.5-kg specimen at 250°C to achieve this state? 10.15) A magnesium-lead alloy of mass 5.5 ka consists of a solid a phase that has a compo- sition that is just slightly below the solubility limit at 200°C (390°F). (a) What mass of lead is in the alloy? (b) If the alloy is heated to 350°C (660°F). how much more lead may be dissolved in the a phase without exceeding the solubility limit of this phase? 10.27 A hypothetical A-B alloy of composition 55 wt% B-45 wt% A at some temperature is found to consist of mass…A core sample is saturated with an oil (?o = 35oAPI), gas and water. The initial weight of the sample is 224.14 g. After the gas is displaced by water (?w = 1 g/cm3 ), the weight is increased to 225.90 g. The sample is the placed in a Soxhlet distillation apparatus, and 4.4 cm3 water is extracted. After drying the core sample, the weight is now 209.75 g. The sample bulk volume, 95 cm3 is measured in a mercury pycnometer. Find the porosity, water saturation, oil saturation, gas saturation and lithology of the core sample.
- A 500 m2 botanical garden which harvest 1000 flowers per day of 15 variations, in a year the average rainfall is 170 cm/yr. With the rainfall 30% percolates into the ground and the rest are harvested in a spherical cistern. 35% of the cistern water is used for watering that percolates into the ground and the rest of water evaporate. Every day they sprinkled water from the cistern and dug wells. Of the dug well water, 75% evaporates and the remainder percolates back into the ground. (Steady State Condition) What is volume of rainfall in the botanical garden? Volume of water in the cistern Volume of water from the well Volume of water that evapotranspiration from the well Total Volume of water that repercolates into the groundWet deposition is a continuous process, while dry removal of air pollutants can be realized only in the presence of precipitation. a. True b. FalseA partially filled one-gallon [gal] pitcher, that has a mass of 0.35 kilograms [kg] when empty, is sitting on a kitchen counter. Assume the total mass of the pitcher and its contents is 2 kilograms [kg]. The pitcher contains a liquid that has a molecular weight of 19.5 grams per mole [(g)/(mol)] and a molarity of 57 moles per liter [(mol)/(L)]. (a) Determine the volume of the liquid in the pitcher in units of liters [L]. (b) Determine the specific gravity of the liquid in the pitcher.
- In a river with a constant flow rate, the factory releases wastewater containing NaCl at a concentration of 200 mmol / L to the river at 20.0 L / s. The Na+ and Cl- concentrations at the downstream observation point were 1.00 mmol / L and 0.800 mmol / L, respectively. What is the river flow Q and Cl- concentration before the inflow of drainage? The river originally contains 0.500 mmol / L of Na+..l Q... PIAT ] Question 20: Which of the following is NOT the advantage of grease? Question 21: The common friction modifiers used in grease is A Trcrosy phosohte (TCP) 8. Diben to (Z00P) Question 22: Synthetic oils are used in aerospace applications because & They can withetand very high range o emperature o 1207 10 5000 F. fiheor Nuinctian 22: ldantifir tha INNCNADDENT ctatamani o} o m > > @ uTRUE OR FALSE __________ 11. The minimum number of centrifuge tubes in a centrifuge machine during its operation is one. __________ 12. Never place reagents directly onto the weighing pan of a balance, always use weighing paper, a beaker, or some other container. __________ 13. To transfer a solution, the stirring rod touches the delivery point of the reagent vessel and the wall of the receiving vessel. __________ 14. An open flame is the heat source for heating or evaporating flammable liquids. __________ 15. Most chemicals used in experiments can be discarded into the sink.