Question

use the periodic table to identify the types of atoms and quantities of each in the following chemical formula.
ca(oh)₂
calcium - 2
oxygen - 2
hydrogen - 2
calcium - 1
oxygen - 2
hydrogen - 2
carbon - 2
oxygen - 2
hydrogen - 2
carbon - 1
oxygen - 1
hydrogen - 2
possible points 6.25

Explanation:

Step1: Analyze the formula \( \text{Ca(OH)}_2 \)

In a chemical formula, the subscript outside a parenthesis multiplies all the atoms inside the parenthesis. For \( \text{Ca(OH)}_2 \):

• The symbol \( \text{Ca} \) has no subscript, so the number of calcium (Ca) atoms is \( 1 \).
• Inside the parenthesis, we have \( \text{O} \) (oxygen) and \( \text{H} \) (hydrogen). The subscript \( 2 \) outside the parenthesis multiplies both \( \text{O} \) and \( \text{H} \). So the number of oxygen atoms is \( 1\times2 = 2 \), and the number of hydrogen atoms is \( 1\times2 = 2 \).

Step2: Evaluate the options

• First option: Claims calcium - 2 (incorrect, Ca has no subscript, so 1 Ca atom).
• Second option: Calcium - 1, oxygen - 2, hydrogen - 2 (matches our analysis).
• Third option: Claims carbon - 2 (the formula has no C, so incorrect).
• Fourth option: Claims carbon - 1, oxygen - 1, hydrogen - 2 (formula has no C, and O count is wrong, so incorrect).

Answer:

The correct option is: calcium - 1, oxygen - 2, hydrogen - 2 (the second option in the list of choices).