Question

Ca → CaCl2  → Ca → CaO → Ca(OH)2 → CaCO3 → CaSO4

Answer 1

Ca + Cl2 = CaCl2

3CaCl2 + 2Al = 3Ca + 2AlCl3

2Ca + O2 = 2CaO

CaO + H2O = Ca(OH)2

SO2 + Ca(OH)2(суспензия) = CaSO3↓ + H2O(при кипячении)

H2SO4(разб., гор.) + CaCO3 = CaSO4↓ + CO2 + H2O

Answer 2

The sequence you've provided represents a series of chemical reactions involving calcium (Ca) and various compounds. Let's break down each step:

1. Ca → CaCl2: In this reaction, calcium reacts with chlorine to form calcium chloride (CaCl2). This reaction typically occurs by combining calcium metal with chlorine gas.

2. CaCl2 → Ca: This step involves the decomposition of calcium chloride. When heated strongly, calcium chloride decomposes to form calcium metal.

3. Ca → CaO: Calcium metal, obtained from the previous step, reacts with oxygen (usually from the air) to form calcium oxide (CaO). This reaction is known as oxidation.

4. CaO → Ca(OH)2: Calcium oxide (CaO) reacts with water (H2O) to form calcium hydroxide (Ca(OH)2). This reaction is called hydration and is often referred to as slaked lime.

5. Ca(OH)2 → CaCO3: Calcium hydroxide (Ca(OH)2) undergoes a reaction with carbon dioxide (CO2) from the air to produce calcium carbonate (CaCO3). This process is known as carbonation and is responsible for the formation of limestone in nature.

6. CaCO3 → CaSO4: Lastly, calcium carbonate (CaCO3) reacts with sulfuric acid (H2SO4) to form calcium sulfate (CaSO4). This reaction is commonly used in industrial processes, such as the production of gypsum.

It's important to note that these reactions are simplified representations and may require specific conditions or catalysts for their completion. Additionally, the actual reaction pathways and intermediate steps may vary depending on the specific circumstances.