Question

1. using the key on the top - row of the picture shown below, (1) list how many atoms of each element are in each molecule shown below, then (2) write the chemical formula for each one.

a. (1) (2)
b. (1) (2)
c. (1) (2)
d. (1) (2)
e. (1) (2)
f. (1) (2)

Explanation:

Step1: Identify elements by key

Use the key (Elements, Compounds, etc.) at the top - row to identify the type of atoms in each molecule.

Step2: Count atoms

Count the number of atoms of each element in each molecule.

Step3: Write chemical formula

Based on the count of atoms of each element, write the chemical formula. For example, if there are 2 atoms of element X and 3 atoms of element Y in a molecule, the formula would be \(X_2Y_3\).

Let's assume the key shows that the gray - colored balls are element A and the white - colored balls are element B:

Molecule A

(1) There are 2 gray and 1 white atoms. So, there are 2 atoms of one element and 1 atom of another element.
(2) The chemical formula is \(A_2B\)

Molecule B

(1) There are 3 gray atoms. So, there are 3 atoms of one element.
(2) The chemical formula is \(A_3\)

Molecule C

(1) There are 1 gray and 2 white atoms. So, there are 1 atom of one element and 2 atoms of another element.
(2) The chemical formula is \(AB_2\)

Molecule D

(1) There are 2 gray atoms. So, there are 2 atoms of one element.
(2) The chemical formula is \(A_2\)

Molecule E

(1) There are 1 gray and 3 white atoms. So, there are 1 atom of one element and 3 atoms of another element.
(2) The chemical formula is \(AB_3\)

Molecule F

(1) There are 2 gray and 2 white atoms. So, there are 2 atoms of one element and 2 atoms of another element.
(2) The chemical formula is \(A_2B_2\)

Answer:

A. (1) 2 atoms of one element, 1 atom of another element; (2) \(A_2B\)
B. (1) 3 atoms of one element; (2) \(A_3\)
C. (1) 1 atom of one element, 2 atoms of another element; (2) \(AB_2\)
D. (1) 2 atoms of one element; (2) \(A_2\)
E. (1) 1 atom of one element, 3 atoms of another element; (2) \(AB_3\)
F. (1) 2 atoms of one element, 2 atoms of another element; (2) \(A_2B_2\)