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Free Science Fair Projects Database

Learn all about the moon, including moon phases, full moon dates, and enjoy the full moon countdown clock.
Search results for free science fair projects for 7th Grade in All Categories:
Alternate Methods of Testing Seed Viability For grades 7 thru 11
Category: Botany
Hypothesis: Hydrogen peroxide will loosen the seed coat more efficiently than the hydrochloric acid and the isopropyl alcohol, and that it will cause the least amount of damage to the seed.
Primary Materials Used: Petri Dishes Kentucky Bluegrass Seeds, Hydrogen Peroxide, Hydrochloric Acid, Isopropyl Alcohol, Triphenyl Tetrazlium, Microscope, Blotter Paper, Seed Strainer, Seed Piercer, White Labels, Warm Oven
Click Here for more details about the "Alternate Methods of Testing Seed Viability" science fair project.


Do Magnets Affect Radish Plant Growth? For grades 4 thru 8
Category: Botany
Hypothesis: The radish plants near a magnet will grow shorter and lean towards the magnet. The radish plants that are not near a magnet will grow straight and taller.
Primary Materials Used: Magnets, Grow Light, Pots, Radish Seeds, Water Dropper, Potting soil, Timer
Click Here for more details about the "Do Magnets Affect Radish Plant Growth?" science fair project.


Electric Charge in Fruits and Vegetables For grades 3 thru 8
Category: Physics
Hypothesis: The potato will have the greatest charge.
Primary Materials Used: Various Fruits and Vegetables, Multimeter
Click Here for more details about the "Electric Charge in Fruits and Vegetables" science fair project.


Heat and Evaporation For grades 2 thru 7
Category: Earth Science
Hypothesis: The light bulb with the highest wattage will cause water to evaporate the fastest.
Primary Materials Used: Light Bulbs, Light Sockets, Cardboard Boxes, Duct Tape, Camera
Click Here for more details about the "Heat and Evaporation" science fair project.


How Do Different Cations and pH Affect Bean Growth For grades 4 thru 8
Category: Botany
Hypothesis: The higher the pH, the poorer the beans would grow, therefore the beans would grow worst in the sodium solution and best in the calcium solution.
Primary Materials Used: Pinto and Great Northern Beans, 4-Quart Plastic Tubs, PVC Pipe, Plastic Needlepoint Cloth, Distilled Water, Sprayer, Sodium Hydroxide, Potassium Hydroxide, Calcium Hydroxide, pH Paper, Disposable Gloves, Aquarium Gravel, Scale
Click Here for more details about the "How Do Different Cations and pH Affect Bean Growth" science fair project.


How Does Incubation Temperature Affect the Sex Ratio of Fruit Flies? For grades 7 thru 10
Category: Zoology
Hypothesis: Female fruit flies will outsurvive the male fruit flies because they have to go through much more harsh labor than the males.
Primary Materials Used: Fruit Flies, Incubator, Vials, Fly Anesthetizer, Magnifying Glass, Tweezers, Thermometer
Click Here for more details about the "How Does Incubation Temperature Affect the Sex Ratio of Fruit Flies?" science fair project.


Musical Rat Mazes For grades 4 thru 8
Category: Zoology
Hypothesis: Rats will learn a maze the best with no music.
Primary Materials Used: Rats, Three Different Mazes, Three Types of Music, Stopwatch, CD Player, Jelly Bread
Click Here for more details about the "Musical Rat Mazes" science fair project.


SPLAT! Forming Craters and Predicting Their Size For grades 3 thru 7
Category: Space and Astronomy
Hypothesis: The size of a crater formed by an object's impact will be greater when the object is bigger and faster. The size of the crater will be predictable after enough data is collected.
Primary Materials Used: Plaster of Paris, Cake Pans, Ladders, Clamps, Kite String, Triple Beam Balance, Wood, Tape Measure
Click Here for more details about the "SPLAT! Forming Craters and Predicting Their Size" science fair project.


The Effect of Slope Angle on the Amount of Eroded Material For grades 4 thru 8
Category: Earth Science
Hypothesis: The steeper the slope angle the more material will be eroded.
Primary Materials Used: Erosion Box, Soil, Triple Beam Balance, Timer, Bucket, Drainer, Standard Lego Blocks, Scientific Calculator, Water, Pitchers, Coffee Filters
Click Here for more details about the "The Effect of Slope Angle on the Amount of Eroded Material" science fair project.


What Angle of Incident Light Striking a Solar Cell Produces the Most Electricity? For grades 3 thru 7
Category: Physics
Hypothesis: Solar cells facing the sun directly (at a 90 degree angle) will be the most efficient.
Primary Materials Used: Solar Cell, Multimeter, Music Stand, Source of White Light, Protractor
Click Here for more details about the "What Angle of Incident Light Striking a Solar Cell Produces the Most Electricity?" science fair project.