When fluorine gas [tex]\((F_2)\)[/tex] is placed in contact with calcium metal [tex]\((Ca)\)[/tex] at high temperatures, they combine to form calcium fluoride [tex]\((CaF_2)\)[/tex]. Let's break down the choices given and identify the correct chemical reaction formula for this process:
1. [tex]\(F_2(l) + Na(s) \longrightarrow NaF_2(s)\)[/tex]
- This reaction involves fluorine and sodium, not fluorine and calcium. Also, sodium fluoride typically forms as [tex]\(NaF\)[/tex], not [tex]\(NaF_2\)[/tex].
2. [tex]\(F_2(g) + Ca(s) \longrightarrow Car(m)\)[/tex]
- The product "Car" is not a recognized chemical species, and there seems to be a mistake in this reaction formula.
3. [tex]\(F_2(g) + Na(s) \xrightarrow{\Delta} NaF_2(l)\)[/tex]
- This reaction involves fluorine and sodium, not calcium. Moreover, the product would be solid sodium fluoride ([tex]\(NaF\)[/tex]), not [tex]\(NaF_2(l)\)[/tex].
4. [tex]\(F_2(g) + Ca(s) \xrightarrow{\Delta} CaF_2(s)\)[/tex]
- This reaction correctly involves fluorine gas [tex]\((F_2)\)[/tex] and calcium metal [tex]\((Ca)\)[/tex], and it produces calcium fluoride [tex]\((CaF_2)\)[/tex] in solid form. The symbol [tex]\(\Delta\)[/tex] indicates that the reaction occurs at high temperature, which is appropriate for this reaction.
Therefore, the correct formula equation for the reaction is:
[tex]\[F_2(g) + Ca(s) \xrightarrow{\Delta} CaF_2(s)\][/tex]
