Question

fill in the missing word(s) or number(s).
1.place numbers to the ____________of formulas to give the same number of atoms of each element type both left and right of the arrow

Explanation:

In chemical equations, coefficients (numbers) are placed in front (left - hand side) of formulas. This is done to balance the equation, ensuring that the number of atoms of each element is the same on both sides of the arrow. For example, in the equation \(2H_2 + O_2
ightarrow2H_2O\), the coefficients \(2\) (for \(H_2\)) and \(2\) (for \(H_2O\)) are placed in front of the formulas to balance the hydrogen and oxygen atoms.

Answer:

front (or left - hand side)