Ninth Grade Science Experiments (Page 121)

Do You Love the Taste of Food? Find Out if You Are a Supertaster!

STEM Activity

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Have you ever noticed that some people are a lot pickier about the food they eat than other people are? They might be more selective because they are supertasters! To supertasters, the flavors of foods are much stronger than to average tasters. Whether or not someone is a supertaster comes down to the taste buds on his or her tongue, and you can actually investigate a person's supertaster status by looking at this. Are you a supertaster? Find out with this tongue-based activity! Read more

Does Chemical Lightening Affect the Structure of Human Hair?

Science Fair Project Idea

Scientific Method

Does your hair go crazy when the weather turns damp? Did you know that strands of hair can relax and lengthen when the humidity increases and then contract again when the humidity decreases? In fact, hair strands can be used as the basis for a hygrometer, a device which measures the humidity level in the air. Can a human hair hygrometer also detect changes in hair structure caused by chemical lightening? This project shows you how to find out. Read more

Does Gender Affect Color Preference?

Science Fair Project Idea

Scientific Method

If you compare products made primarily for boys with products made primarily girls, you will probably notice differences in colors for the two groups. Why do you think this is? Is it the marketplace responding to gender-based color preferences? Do you think it's the other way around, and the products create gender-based color preferences? Design a survey study to find out if gender actually make a difference in color preferences. Here are some questions you might want to consider when… Read more

Does It Sink or Float? Depends on the Soap!

STEM Activity

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If you’ve ever had to wash dishes, you know that the right dish soap can make a dirty job a lot easier. Have you ever wondered how dish soap is able to clean dishes so much more effectively than water alone? Like many household cleaners, dish soap is a surfactant – it helps break up leftover food on plates by making it easier for food particles to dissolve in water. The dish soap also breaks up the water molecules themselves, which leads to some pretty interesting kitchen science… Read more

Does Temperature Affect the Rate of Butterfly Development?

Science Fair Project Idea

Scientific Method

This is an interesting experiment if you are 1) curious about insect metamorphosis and 2) patient! You will need to set up different controlled environments for the chrysalides, and then check on them regularly as you wait for them to hatch. Read more

Does Your Mobile Phone Radiate? Measuring Cell Phone Electromagnetic Radiation

Science Fair Project Idea

Scientific Method

Every day, no matter where you are, you will see people using their cell phones. People use their cell phones for more than just making calls though. They use them for texting and searching the Internet, too. But some health groups are concerned that using your cell phone too much can be hazardous to your health as it exposes your body to electromagnetic radiation. In this electricity and electronics science project, you will investigate how much radiation your cell phone emits when used… Read more

Dog Scents: The Super Nose of Man's Best Friend

Science Fair Project Idea

Scientific Method

Everyone thinks their dog's the best, but in the case of smelling ability, all dogs possess super powers. In fact, a dog's nose can be over a 1,000 times more sensitive than a human's! In this project, learn about smell from a dog's unique perspective. There will be a whole lot of sniffing going on when you set up these fun experiments to find out what scents your dog and other canine friends find most interesting or appealing. Read more

Domino Theory

Science Fair Project Idea

Scientific Method

Have you ever set up a line of dominoes and watched them fall? If you wanted to make your line of dominoes fall faster, do you think you should set the dominoes up with more or less space between them? Set your dominoes up in a straight line, using a ruler to keep the spacing between them constant. Try different spacings at 0.5cm increments. Conduct multiple trials at each spacing, and time how long it takes for a fixed total length of dominoes to fall (e.g., a 1.5 or 3.0 meter length of… Read more

Drag Racing in the Water

Science Fair Project Idea

Scientific Method

It's fun to go swimming! To feel the power of your body as you launch yourself into the water. But did you know that swimming isn't just about skill and athleticism? The human body consists of skin, contours, and curves. How the water moves along your body and the clothing you are wearing determines how fast you can go. In this science fair project, you will investigate the effects of a force called drag. You will compare the time it takes to swim 25 meters in a swimsuit versus swimming the… Read more

Dried Foods: The Science Behind Making Lightweight Snacks

Science Fair Project Idea

Scientific Method

If you've ever been on a long hike, you probably already know how hungry all that walking can make you. But if you're going a long distance, the last thing you want is a heavy pack of snacks on your back. So what can you bring along for a healthy, hunger-satisfying, lightweight snack? How about dried foods, like banana chips or beef jerky? Many foods have high water content. The drying process removes much of the water from the food, leaving behind a lighter, but equally nutritious snack. Just… Read more

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