Question

Ca>Ca(OH)2>CaCO3>CaO>CaCO3>CaCL2

Answer 1

Ca + 2H2O = Ca(OH)2 + H2

Ca(OH)2 + CO2 = CaCO3 + H2O

CaCO3 = CaO + CO2

CaO + CO2 = CaCO3

CaCO3 + 2HCl = CaCl2 + CO2 + H2O

Answer 2

This is not a clear question, as it seems to be a list of chemical compounds with no context or explanation. However, based on the order given, it appears to be a comparison of different calcium compounds in terms of their increasing reactivity or decreasing stability.

The order given is: Ca > Ca(OH)2 > CaCO3 > CaO > CaCO3 > CaCl2

Here's an explanation of each compound's characteristics and how they relate to their position in the list:

• Ca (calcium) is the elemental form of calcium and is the most reactive of the compounds listed.
• Ca(OH)2 (calcium hydroxide), also known as slaked lime, is a basic compound formed by combining calcium oxide (CaO) with water (H2O). It is less reactive than elemental calcium, but still quite reactive compared to the other compounds in the list.
• CaCO3 (calcium carbonate) is a common mineral found in rocks, shells, and the skeletons of marine organisms. It is stable under normal conditions and is less reactive than both Ca and Ca(OH)2.
• CaO (calcium oxide), also known as quicklime, is a highly reactive compound that is formed by heating calcium carbonate (CaCO3). It reacts violently with water and is used in a variety of industrial processes, such as cement production and as a desiccant.
• CaCO3 (calcium carbonate) appears again in the list, which is likely a mistake or a typo.
• CaCl2 (calcium chloride) is a salt composed of calcium and chlorine. It is a relatively stable compound and is less reactive than the other compounds listed.

Overall, the order seems to reflect the increasing reactivity and decreasing stability of the compounds, with elemental calcium (Ca) being the most reactive and CaCl2 being the most stable. However, it's important to note that the reactivity of each compound can depend on the specific conditions in which it is used or stored.