Question

H2=HCl=CaCl2=Ca(NO3)2=CaCO3=CaSO4

Answer 1

H2+Cl2=2HCl

2HCl+CaO=CaCl2+H2O

CaCl2+2AgNO3=Ca(NO3)2+2AgCl

Ca(NO3)2+Na2CO3=CaCO3+2NaNO3

CaCO3+K2SO4=CaSO4+K2CO3

Answer 2

The statement you provided equates different chemical compounds, which is not accurate. Let's clarify the chemical formulas and their meanings:

1. H2: This represents a molecule of hydrogen gas, which consists of two hydrogen atoms bonded together.

2. HCl: This is hydrochloric acid, a strong acid composed of hydrogen (H) and chlorine (Cl) atoms. It is a covalent compound when dissolved in water.

3. CaCl2: This is calcium chloride, an ionic compound formed by the combination of one calcium (Ca) ion and two chloride (Cl) ions.

4. Ca(NO3)2: This is calcium nitrate, an ionic compound formed by one calcium (Ca) ion and two nitrate (NO3-) ions.

5. CaCO3: This is calcium carbonate, a chemical compound that contains one calcium (Ca) ion and one carbonate (CO3^2-) ion.

6. CaSO4: This is calcium sulfate, an ionic compound made up of one calcium (Ca) ion and one sulfate (SO4^2-) ion.

These compounds are all distinct and have different chemical properties and uses. They cannot be directly equated to each other. If you have a specific question about any of these compounds or their reactions, feel free to ask!