Science Experiments Ideas For 6th Graders – 6th grade science fair projects can be fun and educational. The key to finding a good project idea is to choose one that can be completed on time, uses materials you can actually find, and incorporates the scientific method. You can turn any science project into a science fair project by finding one factor you can change (the independent variable) and measuring its effect on another factor (the dependent variable). Predict what you expect or form a hypothesis, record the data, determine if it supports the prediction, and report your findings.
Here is a collection of 6th grade science fair project ideas. Projects include chemistry, biology, physics, geology, meteorology, environmental science and engineering.
Science Experiments Ideas For 6th Graders
Geodes are formed when minerals crystallize from water through the pores of the rock. While natural geodes take millions of years to form, you can make your own geodes in hours or days. Use an eggshell as a “pebble” and crystallize salt, sugar, borax or Epsom salts.
Th Grade Science Fair Projects
Make it an experiment: Turn this cool project into a science fair experiment by predicting how temperature affects crystal structure. You can investigate the effect of cooling rate on crystallization by separating the growing geode with a hot water bath, leaving it at room temperature, and placing it in the refrigerator.
Learn about the principles used by engineers to design buildings that can withstand earthquake-like events. Use styrofoam plates as “soil” and build buildings using craft wood. Attach the craft sticks together using mini marshmallows. Use a sharp pencil to poke a hole in the bottom of the plate to insert the stake holder. These will be the foundations of the building. As you build, tilt the plate from side to side to correct the vibration.
Experiment: What Kind of Structure Survives a Simulated Earthquake Best? Is it rigid or flexible? You can do a similar simulation by building a structure to withstand a storm. Use a fan as a wind and examine how the type of wall affects the stability of the building.
Most color-changing chemical reactions are clock reactions. This means that if you mix the same amount of chemicals under the same conditions, the color change will occur after the same time interval (like clockwork). The Blue Bottle Reaction and The Vanishing Valentine are great clock reactions for sixth grade science projects.
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Experiment: Predict whether changing the concentration of the starting chemical or the temperature of the liquid will increase or decrease the rate of color change. Do the experiment, record the results and see if you can explain them.
Most common plastics are made from petroleum, but you can make plastic from milk. Basically all you’re doing is skimming the milk. Heat 1/2 cup milk or heavy cream over low-medium heat until the lemon juice or vinegar is whisked until the mixture begins to thicken. Remove the saucepan from the heat. Once the liquid has cooled, wash the oil with water. This oil is a natural casein polymer. You made homemade plastic!
Make it a science experiment: Your experiment can explore the properties of this plastic, including how long it stretches, how much weight it can hold, and whether it can be used as a modeling compound. Another way is to compare the amount of plastic you get from cow’s milk with goat’s milk or sheep’s milk. Do you get milky plastic from the cream?
Most leaves look green because of chlorophyll, but in reality they have many different colors. In the fall, plants produce less chlorophyll, so we see more colors. You can use paper chromatography to see the colors in the leaves. To do this, grind the leaves to open their cells (a blender works well), place them in a small jar, add just enough alcohol to cover the leaves, and put some filter paper in the jar. Wear a long strap. You want to extend one end of the paper strip into the leaf mixture and the other end up and out of the bag. As the liquid moves over the paper, it pulls out the dye molecules. Smaller molecules move faster while larger molecules move slower. Over time, these colors separate.
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Experiment: See if you can identify the colors in the leaves based on their colors. Collect leaves from one plant from several seasons. Compare spring, summer, and fall colors. Can you tell the season by the colors on the leaves?
Use a magnet to separate the iron from your breakfast cereal so you can see it. To do this, put a cup of crushed cereal in a zip-top bag and fill the bag half full with hot water. Shake the bowl to mix the contents and allow at least 20 minutes for the flakes to dissolve. Place a strong magnet against the side of the bag and swirl the contents around so that the magnet can hold the iron. Finally, place the magnet against the side of the bag but tilt the bag so you can see the iron. These will appear as small black dots.
Do an experiment: compare iron in different cereals. Do all cereals contain the same amount of iron? Is it the same in all products?
Tooth enamel is the mineral hydroxyapatite (hydrated calcium phosphate), while eggshell is calcium carbonate. Eggshells are redder than tooth enamel, so they stain more quickly. Soak eggs in tea, coffee, soda, and other liquids to determine which stains your teeth. Common beverages contain acids in addition to dyes, so some beverages dissolve eggshells (and teeth). Can you identify them?
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Try this experiment: After dyeing the eggs, predict which methods will work to remove the stains. Try these methods and see if you can figure out how they work.
Learn more about oxidation, which includes tarnish, patina, and rust. Discover the power of common household cleaning chemicals. Soak the stained parts in soap, laundry detergent, lemon juice, salt water, club soda, ketchup, vinegar, salsa, or whatever else you like. After soaking, remove and rinse the parts to see which part cleans best.
Make it an experiment: Part of running this project as an experiment is predicting which chemicals make the best cleaners. Additionally, you need to determine the best time to wash the parts. You can compare the effectiveness of these chemicals in different denominations (such as pennies, quarters, and nickels). Do you think the metal texture of the part affects how well the cleaner works?
Graphite is a form of carbon that conducts electricity. You can draw a graphite line using a pencil to make a simple circuit. Use a battery with both terminals facing forward (like 9V). Flip the battery over on the paper and draw large pencil lines where the terminals rest (don’t connect these lines!). Take an LED and bend the wires so that they are placed separately on the paper. Rest each string on a pencil point. Complete the circuit by drawing lines to connect one terminal of the battery to one end of the LED light and connect the other end of the battery to the LED wire.
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Experiment: Determine whether line length or line thickness affects LED brightness. You can also make the circuit using strips of aluminum foil instead of graphite.
Examine the effect of color on perceived taste by coloring different drinks and food and asking subjects to describe their taste.
Experiment: Compare the flavor of colored and uncolored versions of the same drink. Start with drinks that have no color so that subjects are less likely to guess the flavor of the drink in advance.
Start with a bag of party balloons (ideally all the same color and brand). The fun part of this science fair project is planning it
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You can examine the effect of temperature on balloon size. Consider your options in terms of indoor or outdoor climate and access to freezers and saunas. You have to inflate a balloon and measure its maximum size before popping it. Ask a friend to help you measure, or attach a tape measure to the wall and note the numbers.
Do an experiment: You are on the way to an experiment if you make a prediction about the effect of temperature on the balloon’s maximum size and design a method to test the hypothesis. Can you provide an explanation for your results?
Crayons are made of wax, pigments and sometimes fillers. Check if all the crayons melt at the same temperature. You will need a bunch of different colored crayons, a thermometer and a way to mix them. Fortunately, wax melts at a lower temperature than boiling water, so you can slowly heat the water, watch it melt, and record the temperature. Another method is to place the crayons (not touching) on a cookie sheet on a sheet of waxed paper, heat the oven to 350ºF (or any temperature, really) and record which crayons melt first. .
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