What is the formulae of calcium oxide?

Answer 1

It is CaO, not Ca2. And there is no such thing as calcium II, because the Ca2+ cation that calcium forms is the ONLY cation that it forms. This is true for almost all of the all of the alkali and alkaline earth metals. So it would just be Calcium Oxide, even though it has a plus 2 charge. The (II) is only necessary if the element forms more than one type of ion.

Answer 2

CaO + H20 ---> CO2 + H2 <--- This is wrong, where have the Calcium atoms gone and the Carbon atoms appeared from?

Correct:

Ca (s) + 2H₂O (l) --> Ca (OH)₂ (aq) + H₂ (g) <--- this is wrong, she/he asked for the reaction of calcium oxide with water not just calcium

It's: CaO + H2O = Ca(OH)2

Answer 3

Ca(OH)2

Ca needs two more electrons to have a full outer shell, OH needs one electron to have a full valence. So in order to have a ratio of 1:1, you need 2OH.

Answer 4

Sodium hydroxide is NaOH Calcium chloride is CaCl2

Answer 5

Sodium oxide: Na2O

Calcium oxide: CaO

Answer 6

The ionic chemical formula for calcium oxide is Ca2+ + O2-.

Answer 7

CaO . Otherwise known as Lime or Quicklime.

Answer 8

the formula for calcium oxide is CaO.

Answer 9

Calcium hydroxide is Ca(OH)2.

Answer 10

CaO