Question

Write the following in the form of a word equation:
Sodium hydroxide reacts with calcium bromide to form calcium hydroxide and sodium bromide.In the formula $CaB{r}_2$​ what does Ca stand for and what is its valency?

• A. Sodium hydroxide + calcium bromide = Calcium hydroxide + sodium bromide; calcium; 1
• B. Sodium hydroxide + calcium bromide $\to$ Calcium hydroxide + sodium bromide; calcium; 2
• C. Sodium hydroxide + calcium bromide $\leftrightarrow$ Calcium hydroxide + sodium bromide; calcium; 2
• D. Sodium hydroxide + calcium bromide $\to$ Calcium hydroxide + sodium bromide; potassium; 2

Answer 1

The correct option is B Sodium hydroxide + calcium bromide $\to$ Calcium hydroxide + sodium bromide; calcium; 2

The word equation will be be written as:
Sodium hydroxide + calcium bromide $\to$ Calcium hydroxide + sodium bromide.
Ca stands for calcium. From the formula $CaB{r}_2$ it is evident that the valency of calcium is 2 and the valency of bromine is 1.