Question

6 multiple choice 1 point
complete the reaction:
li(s) + ca(oh)₂(aq) → ca(s) + ____________
ca(oh)₂
li(oh)₂
(oh)li
li(oh)

Explanation:

Step1: Analyze the reaction type

This is a single - displacement reaction. In a single - displacement reaction, the general form is \( A+BC
ightarrow AC + B \). Here, \( A=\text{Li} \), \( B = \text{Ca} \), and \( C=\text{OH} \).

Step2: Determine the product formula

For the hydroxide of lithium, the charge of \( \text{Li}^+ \) and \( \text{OH}^- \). Using the criss - cross method (since the charge of \( \text{Li}^+ \) is \( + 1 \) and the charge of \( \text{OH}^- \) is \( - 1 \)), the formula of lithium hydroxide is \( \text{LiOH} \).

• Option A: \( \text{Ca(OH)}_2 \) is a reactant, not a product.
• Option B: The formula \( \text{Li(OH)}_2 \) is incorrect. The charge of \( \text{Li}^+ \) is \( + 1 \), and for a neutral compound, the ratio of \( \text{Li}^+ \) to \( \text{OH}^- \) should be \( 1:1 \).
• Option C: The formula \( (\text{OH})\text{Li} \) does not follow the correct chemical formula writing convention (cation first, then anion).

Answer:

D. \( \text{Li(OH)} \)