Question 1
Which representation of a reaction shows the substances present before and after a reaction using chemical formulas?
Question 2
In the reaction $2\,\text{H}_2 + \text{O}_2 \rightarrow 2\,\text{H}_2\text{O}$, what does the coefficient $2$ in front of $\text{H}_2$ mean?
Question 3
What is the main purpose of balancing a chemical equation?
Question 4
Which equation is already balanced?
Question 5
What does the state symbol $(aq)$ mean in a chemical equation?
