Question

predict the products for the single replacement reactions given. check to see that the equations are balanced.
$ce{ca + mgcl_{2} -> ?}$
$ce{cacl_{2} + mg}$
$ce{ca + cl_{2}}$
$ce{mg + cl_{2}}$
$ce{cacl + mg}$
done

Explanation:

Step1: Identify single replacement logic

In single replacement, a more reactive metal replaces a less reactive metal in a salt. Calcium (Ca) is more reactive than magnesium (Mg), so Ca replaces Mg in $\text{MgCl}_2$.

Step2: Write unbalanced product equation

$\text{Ca} + \text{MgCl}_2
ightarrow \text{CaCl}_2 + \text{Mg}$

Step3: Verify balanced equation

Count atoms: Left side: 1 Ca, 1 Mg, 2 Cl. Right side: 1 Ca, 1 Mg, 2 Cl. The equation is balanced.

Step4: Eliminate incorrect options

Other options either do not follow single replacement rules or have unbalanced/incorrect products.

Answer:

$\text{CaCl}_2 + \text{Mg}$