Write the formulas for: Ca and CI, Na and CI, H and 0, Al and 0, and K and F.

Below

Explanation:

Combination of Calcium(Ca) and Chlorine(Cl); Calcium chloride

Combination of Sodium(Na) and Chlorine(Cl); Sodium chloride(salt)

Combination of Hydrogen(H) and Oxygen(O);(water)

Combination of Potassium (K) and Fluorine(f) ; Potassium fluoride

pure substance: iron,copper

impure substance: water,charcoal

answer: -

reaction:

na + cl ⇌ nacl

balanced chemical equation:

na + 2cl ⇌ nacl2

sodium + clorine goes to form sodium chloride (table salt).

the product is nacl2.

and the reactants are na and cl.

(note: if you don’t know what ⇌ means, read below: -

⇌(double head arrow) means reversible reaction).