A chemistry poster shouldn't be just a decoration. Instead, it should demonstrate relevant chemistry topics. If you plan to use the poster as a year-round classroom decoration, consider including basic chemistry equations, the periodic table of the elements or examples of chemistry in real-life. If you're using the poster as part of a lesson plan, it should expand on the lesson by demonstrating formulas and application. Don't choose generic photos or artwork. Instead, use the poster to clearly and simply demonstrate what you're teaching.
Students are unlikely to pay attention to a poster covered in tiny diagrams, painstaking formulas and other information that can be difficult to take in from a distance. Thus it's important to make the poster as large as you can so that the information it contains is visible from a distance. Bright colors, block letters and print text will increase the poster's visibility and readability.
Even though chemistry affects our everyday lives, students often struggle to see these connections. Use images to connect the abstract formulas of chemistry to real life. Don't just use pictures of students mixing chemicals. Instead, try visually demonstrating each component of a chemistry formula as well as the end result.
Avoid creating a chemistry poster to teach information that you haven't yet taught in class. This can be confusing to students, especially to those who don't learn visually. Instead, use the poster as a tool to reinforce and demonstrate things you've already taught. This allows students to use the poster as a handy reference rather than waste time puzzling over what the confusing diagrams on the poster mean.