Science, Tech, Math › Science Science Fair Project Ideas for 12th Graders Share Flipboard Email Print Science Fair Projects for Every Grade Science Fair Ideas First Grade Second Grade Third Grade Fourth Grade Fifth Grade Sixth Grade Seventh Grade Eighth Grade Ninth Grade Tenth Grade Eleventh Grade Twelfth Grade Blend Images - KidStock / Getty Images By Anne Marie Helmenstine, Ph.D. Chemistry Expert Ph.D., Biomedical Sciences, University of Tennessee at Knoxville B.A., Physics and Mathematics, Hastings College Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. She has taught science courses at the high school, college, and graduate levels. our editorial process Facebook Facebook Twitter Twitter Anne Marie Helmenstine, Ph.D. Updated July 30, 2019 Twelfth-grade science fair projects can be interesting and even groundbreaking. High school seniors should be able to identify a project idea on their own and can conduct the science fair project and report on it without much assistance. Most 12th-grade science fair projects will involve proposing a hypothesis and testing it with an experiment. Advanced models and inventions offer other options for a successful 12th-grade project. 12th Grade Science Fair Project Ideas What is the best way to keep the fizz in an opened carbonated soft drink?Find and test a non-toxic antifreeze.Study the toxicity of energy drinks.Measure the toxicity of silver-mercury amalgam fillings.Determine which type of invisible ink is the most invisible.Measure crystal growth rate as a function of temperature.Which pesticide is most effective against cockroaches? ants? fleas? Is it the same chemical? Which pesticide is safest for use around food? Which is friendliest to the environment?Test products for impurities. For example, you could compare the amount of lead in different brands of bottled water. If a label says a product does not contain heavy metal, is the label accurate? Do you see any evidence of leaching of hazardous chemicals from plastic into water over time?Which sunless tanning product produces the most realistic-looking tan?Which brand of disposable contact lenses last the longest before a person decides to switch them out?Formulate a non-toxic or biodegradable ink.Make an edible water bottle and compare the environmental impacts of it versus other water bottles.Test the efficiency of different shapes of fan blades.Can bath water be used for watering plants or the garden?Can you tell how much biodiversity is in a water sample by how murky the water is?Study the effect of landscaping on a building's energy consumption.Determine whether ethanol really does burn more cleanly than gasoline.Is there a correlation between attendance and GPA? Is there a correlation between how close to the front of the classroom a student sits and GPA?Compare the wet strength of different brands of paper towels.Which method of cooking destroys the most bacteria?Are hybrid cars really more energy-efficient than gas or diesel-powered cars?Which disinfectant kills the most bacteria? Which disinfectant is the safest to use?