Question

fluorine gas is placed in contact with calcium metal at high temperatures to produce calcium fluoride powder. what is the formula equation for this reaction?
o f2(l) + na(s)→naf2(s)
o f2(g) + ca(s)→caf2(l)
o f2(g) + na(s)△→naf2(l)
o f2(g) + ca(s)△→caf2(s)

Explanation:

Step1: Identify reactants

Fluorine gas ($F_2$) and calcium metal ($Ca$).

Step2: Determine product

Calcium fluoride ($CaF_2$).

Step3: Check states and reaction condition

Fluorine is gas ($g$), calcium is solid ($s$), calcium fluoride is solid ($s$) and reaction is at high - temp (denoted by $\Delta$). So correct equation is $F_2(g)+Ca(s)\xrightarrow{\Delta}CaF_2(s)$.

Answer:

D. $F_2(g)+Ca(s)\xrightarrow{\Delta}CaF_2(s)$