When you balance a chemical equation, what may you change?

The coefficients in front of the formulas

Which law requires that a chemical equation be balanced?

The law of conservation of mass

Copper is less reactive than zinc, so it cannot replace it

The coefficients of the balanced equation

The reactant used up first; it determines the maximum product

12questions. Pick an answer and you'll see why right away.

When you balance a chemical equation, what may you change?
Which law requires that a chemical equation be balanced?
What are the balanced coefficients for $\text{C}_3\text{H}_8 + \text{O}_2 \rightarrow \text{CO}_2 + \text{H}_2\text{O}$ ?
How is the reaction $\text{CaCO}_3 \rightarrow \text{CaO} + \text{CO}_2$ classified?
Why will copper not displace zinc from zinc sulfate solution?
What is the molar mass of glucose, $\text{C}_6\text{H}_{12}\text{O}_6$ ? Use C = 12, H = 1, O = 16.
How many moles are in 88 g of carbon dioxide ( $M = 44$ g/mol)?
For $\text{N}_2 + 3\text{H}_2 \rightarrow 2\text{NH}_3$ , how many moles of ammonia form from 9 mol of hydrogen?
In a stoichiometry problem, the mole ratio comes from which part of the equation?
What is the limiting reactant, and what does it determine?
A reaction has a theoretical yield of 60 g but produces 45 g. What is the percent yield?
In $\text{Zn} + \text{Cu}^{2+} \rightarrow \text{Zn}^{2+} + \text{Cu}$ , which species is oxidized?