Question

balance ___ MgO + ____ CaS → ____ MgS + ____ CaO

Answer 1

To balance the chemical equation:

\[
\_\_\_ \text{MgO} + \_\_\_ \text{CaS} \rightarrow \_\_\_ \text{MgS} + \_\_\_ \text{CaO}
\]

Let's first write the unbalanced equation:

\[
\text{MgO} + \text{CaS} \rightarrow \text{MgS} + \text{CaO}
\]

Now, we'll determine the number of atoms of each element on both sides of the equation:

**Reactants:**
- 1 Mg (from MgO)
- 1 O (from MgO)
- 1 Ca (from CaS)
- 1 S (from CaS)

**Products:**
- 1 Mg (from MgS)
- 1 S (from MgS)
- 1 Ca (from CaO)
- 1 O (from CaO)

Now we can see that the number of each type of atom is the same on both sides. Therefore, the equation is already balanced:

\[
\text{1 MgO} + \text{1 CaS} \rightarrow \text{1 MgS} + \text{1 CaO}
\]

The balanced equation is:

\[
1 \text{MgO} + 1 \text{CaS} \rightarrow 1 \text{MgS} + 1 \text{CaO}
\]

So, filling in the blanks:

1 MgO + 1 CaS → 1 MgS + 1 CaO.