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Calcium sulfate: Quiz


Question 1: Calcium sulfate is a common component of ________ deposits in industrial heat exchangers.

Question 2: cement manufacture) are scrubbed to reduce their sulfur oxide content, by injecting finely ground ________ or lime.
Karst topographySedimentary rockCarbonate rockLimestone

Question 3: [2] They appear to differ only in ________ size.
CrystalSolidCarbonCrystal structure

Question 4: The endothermic property of this reaction is exploited by ________ to confer fire resistance to residential and other structures.
FireproofingFirestopDrywallPassive fire protection

Question 5: In the refining of zinc, solutions of zinc sulfate are treated with lime to co-precipitate heavy metals such as ________.

Question 6: Heating gypsum to between 100 °C and 150 °C (302 °F) partially ________ the mineral by driving off approximately 75% of the water contained in its chemical structure.
Diabetic ketoacidosisHypernatremiaDehydrationHyponatremia

Question 7: In the production of ________ from phosphate rock, calcium phosphate is treated with sulfuric acid and calcium sulfate precipitates.
OxygenPhosphorusCitric acidPhosphoric acid

Question 8: This reaction is exothermic and is responsible for the ease with which gypsum can be cast into various shapes including sheets (for ________), sticks (for blackboard chalk), and molds (to immobilize broken bones, or for metal casting).
FirestopDrywallFireproofingPassive fire protection

Question 9: In ________, exhaust gases from fossil-fuel-burning power stations and other processes (e.g.
Flue-gas desulfurizationScrubberSulfuric acidIncineration

Question 10: Small amounts of calcined gypsum are added to earth to create strong structures directly from cast earth, an alternative to ________ (which loses its strength when wet).
Cob (material)Rammed earthAdobeNatural building


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