Question

A) Ca → CaO → Ca(OH)2 → CaO → CaCl2;​

Answer 1

Відповідь:

2 Ca + О2 = 2 CaO

CaO + Н2О = Ca(OH)2

Ca(OH)2 = CaO + Н2О (реакція відбувається при нагріванні)

CaO + 2 HCl = CaCl2 + H2O

Пояснення:

Answer 2

It seems like you've provided a series of chemical reactions involving calcium (Ca) and various compounds. Let's break down the reactions step by step:

1. Ca → CaO: This represents the conversion of calcium (Ca) to calcium oxide (CaO) through a process such as heating calcium in the presence of oxygen. The chemical equation for this reaction is:

   2Ca + O2 → 2CaO

2. CaO → Ca(OH)2: Here, calcium oxide (CaO) reacts with water (H2O) to form calcium hydroxide (Ca(OH)2). The chemical equation for this reaction is:

   CaO + H2O → Ca(OH)2

3. Ca(OH)2 → CaO: This appears to be the reverse of the previous reaction. It represents the conversion of calcium hydroxide (Ca(OH)2) back to calcium oxide (CaO). This can be achieved by heating the calcium hydroxide, driving off the water. The chemical equation for this reaction is the reverse of the previous one:

   Ca(OH)2 → CaO + H2O

4. CaO → CaCl2: This reaction involves the reaction of calcium oxide (CaO) with hydrochloric acid (HCl) to form calcium chloride (CaCl2). The chemical equation for this reaction is:

   CaO + 2HCl → CaCl2 + H2O

So, in summary, you have a series of reactions where calcium (Ca) is converted to calcium oxide (CaO), then to calcium hydroxide (Ca(OH)2), back to calcium oxide (CaO), and finally to calcium chloride (CaCl2) through various chemical reactions.