Consider adding citations on individual slides. Plus you can add them in a slide at the end the end of the presentation. Check with the professor for ideas and expectations about adding citations to your presentation.

You will be using American Chemical Society Style. See "Citing Sources" in this guide.

Here are some ideas that you might want to adapt from this guide about citing business sources, but (again) use American Chemical Society style.

Here is a very helpful video about doing presentations, including best practices for using Powerpoint as well as presentation techniques.

Creating Effective Presentations (materials assembled by Lehigh LIbrary and Technology Services staff members Jarret Brown and Holly Zakos ).

It's a good idea to add the sources you used to the final slide of your presentation Powerpoint. And/or you can add citations at the bottom of individual slides.