Eleventh Grade Science Experiments (Page 60)

Biowarfare: Experiment with Viruses that Destroy Bacteria

Science Fair Project Idea

Scientific Method

Most people are not aware that the soil around them is a battle scene. The combatants are very small—bacteria on one side and bacteriophage on the other. The bacteriophage (or phage for short) try to pierce the outer coats of the bacteria and inject them with phage DNA. If successful, the DNA will take over the inner machinery of the bacterial cells and force them to make many copies of the phage. After the copies are made, the bacterial cells break apart, releasing new phage that start… Read more

BLAST into the Past to Identify T. Rex's Closest Living Relative

Science Fair Project Idea

Scientific Method

Believe it or not, scientists were recently able to recover tissue from a 68-million-year-old Tyrannosaurus rex fossil! Not only were they able to purify non-mineralized tissue, but they also succeeded in obtaining partial sequence information for protein molecules in the T. rex tissue. In this genomics science fair project, you will use the T. rex's protein sequence to search sequence databases for the its closest living relatives. Read more

Blood Clotting to the Rescue: How to Stop Too Much Blood from Flowing

Science Fair Project Idea

Scientific Method

Have you ever had a cut or a bloody nose that seemed like it would bleed forever? Though it might have seemed like a long time, it probably did stop pretty quickly. This is because different factors in a person's blood normally work together to plug the opening caused by the cut in a process called blood clotting or coagulation. However, some people have a genetic disorder called hemophilia that causes them to bleed excessively. If a person has hemophilia, he or she is usually missing some of… Read more

Blood Sugar Balancing Act: How Exercise Tips the Scales

Science Fair Project Idea

Scientific Method

You are probably very familiar with the fact that over time, exercise changes your muscles, your lungs, your bones, and even your mindset; but did you know it has an immediate effect on your body's biochemistry? You can see this in the amount of glucose (a type of sugar your body uses for fuel) circulating in your blood. Blood glucose levels change as you exercise. For most people, this is not a big deal. But for top-level athletes in the middle of intense exercise (like a marathon), or for… Read more

Boyle's Law: Pressure vs. Volume of a Gas at Constant Temperature

Science Fair Project Idea

Scientific Method

This is a modern version of a classic experiment by Robert Boyle on the compressibility of gases. Boyle discovered the relationship between pressure and volume of gases that now bears his name. This project shows you a simple method for re-creating this famous experiment. Read more

Build a Bird Feeder to Study Birds

STEM Activity

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Did you know that there are about 10,000 different types of birds in the world? You don't have to go far to see some of them. Birds live outside in backyards and parks and can even be found in a busy city! Do you know what kinds of birds live in your neighborhood? Have you ever taken a close look at the birds you see in your backyard to identify them and observe their behavior? In this activity, you will build a bird feeder to attract birds, so you can study them. Read more

Build a Bottle Centrifuge

STEM Activity

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Have you ever ridden a merry-go-round at a playground? Did you notice how you felt like you were being flung toward the outside, so you needed to hold on to stay in place? Scientists make use of this effect in a centrifuge, which is a machine that separates substances based on their density. They can, for example, use it to separate different substances within a blood sample. In this fun activity, you will build your own simple bottle centrifuge and test how it works. Are you ready for a spin? Read more

Build a Cardboard Scissor Lift

STEM Activity

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Have you ever wanted to reach something way up high on a shelf? What about construction workers who need to reach up the side of a building or a tall utility pole? A scissor lift is a device that can extend to a great length but also fold up very compactly, making it easy to reach high places. In this project you will build your own from common household materials! Read more

Build a Disk Siren

STEM Activity

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If you live in an urban area, you probably hear them almost every day: sirens. Police cars, ambulances, fire trucks—they all can come blaring. Their wailing sounds are piercingly loud to help alert others to clear the road in front of them. But have you ever thought about how this loud noise is generated? Make your own disk siren in this activity and find out for yourself. Read more

Build a Fuzzy Companion Robot

Science Fair Project Idea

Engineering Design Process

Snuggling a dog or cat can make you feel better even when you are not lonely or sick. Therapy and companion animals are also used for patients in health care settings, but sometimes you cannot always have access to a real live animal. Can a robot serve the same purpose? Find out in this project when you add an Arduino to a stuffed animal to build a purring companion robot. Read more

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