Visual aids are super helpful for Year 12 Chemistry students. They make it easier to understand the relationships in chemical reactions. Here’s why they are so useful:

1. Molar Ratio Pictures: Diagrams or charts can show the molar ratios of substances in a chemical reaction. For example, when hydrogen and oxygen combine to make water, a visual can illustrate that 2 parts of hydrogen react with 1 part of oxygen, creating 2 parts of water. It looks like this:
   $2 H_2 + O_2 \rightarrow 2 H_2O$

2. Graphs and Tables: Charts can present information about how much of each substance is used or what the yield percentages are. This helps students quickly see the relationships in the data.

3. Visual Proportions: Using pictures or models to show how molecules work together can also help reinforce the idea of mole ratios. For instance, visualizing two H$_2$ molecules for every O$_2$ molecule can help students understand the reaction proportions better.

By using these visual aids in their studies of stoichiometry, students can see and understand the basic ideas behind chemical reactions more clearly.