Below are two different chemical formulas.

Question

Formula 1: CaCl2

Formula 2: CaC2


Which statements about the chemical symbols of the elements within each formula are correct? Select two.
A.
Both formulas contain one atom of the element aluminum.
B.
Both formulas contain one atom of the element calcium.
C.
Formula 2 contains two atoms of the element carbon.
D.
Both formulas contain the element carbon.
E.
The second formula contains three atoms of the element carbon.

Answer 1

The correct statements about the chemical symbols of the elements within each formula are:

B. Both formulas contain one atom of the element calcium.
C. Formula 2 contains two atoms of the element carbon.

Explanation:

• Formula 1 (CaCl2) contains one atom of calcium (Ca) and two atoms of chlorine (Cl).
• Formula 2 (CaC2) contains one atom of calcium (Ca) and two atoms of carbon (C).

Thus, statements B and C are correct.