Question

Ca - CaO - Ca(OH)2 - CaSO4

Answer 1

1. 2Са + О₂ → 2СаО

2. СаО + Н₂О → Са(ОН)₂

3. Ca(OH)₂ + H₂SO₄ → CaSO₄ + 2H₂O

Answer 2

It looks like you've provided a sequence of chemical compounds involving calcium (Ca). Let me break down each compound for you:

1. Ca: This stands for calcium, a chemical element with the symbol Ca and atomic number 20. It is an essential element for various biological processes in living organisms and has numerous industrial applications.

2. CaO: This is calcium oxide, commonly known as quicklime or burnt lime. It's a white, alkaline, and crystalline solid that is produced by heating calcium carbonate (CaCO3) to high temperatures. Calcium oxide is used in various applications, including as a chemical reagent, in cement production, and for soil stabilization.

3. Ca(OH)2: This is calcium hydroxide, also known as slaked lime or hydrated lime. It's a white powder obtained by adding water to calcium oxide. Calcium hydroxide has many uses, such as in construction (as a component of lime mortar and lime plaster), in agriculture (for soil amendment), and in various industrial processes.

4. CaSO4: This is calcium sulfate, a compound that exists in different forms, including anhydrous (CaSO4), dihydrate (CaSO4·2H2O, known as gypsum), and hemihydrate (CaSO4·0.5H2O, known as plaster of Paris). Calcium sulfate has uses in construction, as a soil conditioner, and in the food industry as a firming agent and coagulant.

This sequence appears to show a progression from the base element calcium (Ca) to compounds derived from it through chemical reactions and processes. If you have any specific questions about these compounds or their properties, feel free to ask!