Brainliestttme : )
when calcium metal (ca) reacts with oxygen gas (o2), it produces the ionic compound calcium oxide (cao). write the balanced equation for this reaction. then, explain if this process meets the requirements to be considered a redox reaction.

Here's what I get  

Explanation:

1. Balanced equation

2Ca + O₂ ⟶ 2CaO

2. Redox reaction?

CaO is an ionic compound. It consists of Ca²⁺ ions and O²⁻ ions.

2Ca ⟶ 2Ca²⁺ + 4e⁻

When Ca becomes Ca²⁺, it loses electrons, and loss of electrons is oxidation.

O₂ + 4e⁻ ⟶ 2O²⁻  

When O becomes O²⁻, it gains electrons, and gain of electrons is reduction.

Thus, the reaction meets the requirements for a redox reaction.

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)