There isn't money left in most 2014-2015 science department budgets this late in the school year. For inexpensive chemistry lab ideas, buy my lab book Chemistry on a Budget for $20.56 at amazon.com or $23 at lulu.com. It will take a few weeks to get to you, so order now!
This book contains 13 labs using consumable materials purchased from local stores including Analysis of a Mixture, Paper Chromatography, and Coinium (using pennies to demonstrate half-life). There are two versions of each lab, one with a ten-question conclusion and one with directions for a full lab report. This way the teacher has the option! Each lab is two pages to allow for one two-sided handout.
This blog contains several past entries about the end of the school year including: Final Exams –End of Year Preparation posted on 6/8/2014; and, End of Year Activity – Lab Clean-Up posted on 6/15/2014. A few other pages that might be useful are Midterm Examinations posted on 1/4/2015 and Decorating Your Classroom posted on 7/6/2014.
Students may be seeking Extra Credit opportunities. Research via the Internet is very easy, so research of many topics is easy for students to accomplish.
Since the end of the school year approaches, the topic of Cleaning may be timely. Perhaps your students could research Natural Cleaners and work to list the chemical ingredients. Surprisingly affective cleaners are sodium hydrogen carbonate (baking soda) and acetic acid (vinegar). These substances could be researched as well.
Also, this blog contains several entries that would be helpful to your chemistry classroom. Remember, you can check out the Topic List to help you to find past Blog entries.
Have a good weekend!