Question

kiley wants to balance the equation $\ce{h_{2} + n_{2} -> nh_{3}}$. which would be her first step in balancing an equation?
\bigcirc multiplying the subscripts in the atoms of the reactants together
\bigcirc adding the coefficient 3 in front of $\ce{h_{2}}$ and the coefficient 2 in front of $\ce{nh_{3}}$
\bigcirc changing the subscripts so they match for the total number of atoms
\bigcirc creating a chart that shows the number of atoms in the reactants and products

Explanation:

To balance a chemical equation, the first step is to determine the number of each type of atom in the reactants and products. Creating a chart (like a table) to list the number of atoms of each element on both sides helps in identifying the imbalances. Multiplying subscripts (first option) is incorrect as it changes the compound. Changing subscripts (third option) is also wrong for the same reason. Adding coefficients (second option) is a later step after identifying the atom counts. So the correct first step is creating a chart for atom counts.

Answer:

D. creating a chart that shows the number of atoms in the reactants and products