Twelfth Grade Science Experiments (Page 136)

Investigate Native Plant Evolution with Chloroplast Sequencing

Science Fair Project Idea

Scientific Method

Native plants are important for both ecological and medicinal reasons. However, most native plants are not very well studied. One way to know more about these plants is to understand which other species of plants they are most closely related to. In this science project you will sequence part of the chloroplast genome from a native plant and use this information to determine its evolutionary relationship to other species of plants. If the plant you chose has not been sequenced before, you can… Read more

Investigate the 'Death' of an Orange: How is Rate of Heat Loss Based on the Surrounding Temperature?

Science Fair Project Idea

Scientific Method

Imagine that you are a detective investigating a murder. You have a body that was found in a swimming pool, and someone reported hearing an argument near the pool at 10:00 PM the night before. Your first question might be "Was this person killed around 10:00 PM last night, or at some other time?" One way to answer this question is to measure the internal temperature of the body. The longer ago the killing occurred, the colder the body. But can you assign a specific time of death to a specific… Read more

Investigate the Vitamin C Level in Bell Peppers During Various Stages of Ripeness

Science Fair Project Idea

Scientific Method

Vitamin C is a water-soluble vitamin that has many functions in the body. Vitamin C is needed to bolster the immune system. It is an antioxidant that protects LDL cholesterol from oxidative damage, and it is needed to make collagen, a substance that strengthens many parts of the body, such as muscles and blood vessels. Our bodies do not make vitamin C, so we must get it from dietary sources. Citrus fruits, carrots, avocados, and spinach all have vitamin C. Bell peppers, like the ones shown in… Read more

Investigating the Role of Procedural Music in Video Games

Science Fair Project Idea

Engineering Design Process

Have you ever wondered about the various types of music in a video game you've played? You may not have paid much attention to the music, but its job was to enhance your gaming experience. In fact, the wrong kind of music can detract from the atmosphere of the game. Can you imagine the music in Mario KartTM playing in Street Fighter®? In a game, music can indicate many different things, such as a special or new event, shift of mood, or the arrival of a character. This kind of music is… Read more

Invisible Marshmallow Ink – Send Sweet Secret Messages Using Marshmallows!

STEM Activity

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When we put toast in the toaster, or add marshmallows to the top of our sweet potatoes at Thanksgiving, we expect them to turn brown, and to develop a sweet, caramelized flavor. Although we expect it to happen, do you know why certain foods take on these new colors and flavors as they are toasted? In this activity you will explore the reaction that creates these tasty, toasty treats, and experiment with speeding up and slowing down the process. Read more

Is a Deleted File Really Gone?

Science Fair Project Idea

Scientific Method

When you delete a file, by accident or on purpose, is the information really gone? Can you get it back? If you accidentally deleted your five-page report for school, you may be hoping it is not really gone. On the other hand, if you do not want someone to get their hands on the goofy and unflattering pictures you and your best friend took while staying up late the other night, you probably hope the files you deleted are gone for good! Computer experts are often asked about file recovery.… Read more

Is It OK to Cheat If Everyone Else Is?

Science Fair Project Idea

Scientific Method

Tests, homework, taxes, speed limits, sports: there's always the possibility of cheating. Design a survey to investigate attitudes about cheating. Are some kinds of cheating worse than others? Are there times when it is OK to cheat, or is cheating always wrong? Do people who admit to cheating have the same attitudes as those who don't? Read more

Is Smiling Contagious?

Science Fair Project Idea

Scientific Method

You've probably observed from your own personal experiences that some actions are contagious. Yawning is a great example. When one person in a room yawns, several other people usually do, too. Coughing, clearing your throat, these are other actions that often seem contagious. But what about smiling? Have you ever walked down the street and had a random stranger smile at you? Did it make you happy? Did you smile back? In this science fair project, you'll investigate whether smiling is… Read more

Is That Cat Overweight?

Science Fair Project Idea

Scientific Method

Did you know that there are millions of overweight cats and dogs in the United States? Is your pet one of them? How about your neighbor's cat or your grandma's dog? In this science project you'll determine what percentage of the pets you know are overweight and how their weights compare to pets' weights throughout the United States. Read more

Is the Egg Raw or Cooked? That is the Question!

STEM Activity

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Have you ever found an egg in your refrigerator and wondered if it was cooked? Although eggs drastically change inside their shells when cooked, it is still remarkably difficult to distinguish a cooked egg from a raw one without cracking it open. In this activity, you will find out how physics can help you tell the difference! Read more

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