Chemistry Nomenclature 2025 – 400 Free Practice Questions to Pass the Exam

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What is the common name for calcium sulfate?

Gypsum

Calcium sulfate is commonly known as gypsum. This mineral naturally occurs in the form of hydrated calcium sulfate (CaSO4·2H2O), often found in sedimentary rock formations. Gypsum is widely used in various applications, including manufacturing plaster, drywall, and as a soil conditioner in agriculture due to its ability to improve soil structure and reduce erosion.

The other substances listed are not synonymous with calcium sulfate. Lime typically refers to calcium oxide (CaO) or calcium hydroxide (Ca(OH)2), which have different properties and uses. Chalk is primarily composed of calcium carbonate (CaCO3), while soda ash is sodium carbonate (Na2CO3), used mainly in glass manufacturing and as a cleaning agent. Therefore, the association of calcium sulfate with the common name gypsum is accurate and reflects its composition and applications.

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Lime

Chalk

Soda ash

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