Ninth Grade, Chemistry Science Experiments (Page 16)

Find the Missing Ingredient

STEM Activity

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Food advertisements and labels bombard us with enticing slogans and attractive images, luring us into consuming the food. But have you ever wondered how nutritious the food is? Have you ever looked at a nutrition facts label and wondered what the columns of words and numbers meant? This activity will shed some light on the label. You will explore serving sizes and nutrients, and might find a discrepancy. Why would the sum of the nutrients not always add up to the total? Like a detective,… Read more

How to Help Pass Gas

STEM Activity

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Has your stomach ever ached so bad you felt as if it was blown up like a balloon—maybe after the big Thanksgiving meal? You may have had a large amount of gas trapped in your stomach and intestines. But where does the gas come from that makes you feel so uncomfortable, and how does it disappear again? In this activity, you will blow some bubbles to investigate how a specific medicine can help you feel better, so next time your tummy hurts because you are bloated, you will know how to cure… Read more

Keep Your Candy Cool With the Power of Evaporation!

STEM Activity

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Have you ever wondered how sweating helps keep you cool on a hot summer day? Sweat, which is mostly water, cools us down when it evaporates. When water evaporates, it changes from a liquid to a gas. The gas carries away heat with it, helping to remove heat from your skin. Not only can evaporation cool down your body, it can also cool down other things, such as chocolate. Heat on a hot summer day can turn your solid candy bar into a gooey, melted mess, but how well can evaporation keep your… Read more

Mac and Cheese Science: What Makes a Thick Sauce?

STEM Activity

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There’s nothing like your favorite comfort food after a long day, right? Maybe it’s beef stew or a really great salad, or many people’s favorite, macaroni and cheese. The sauce has got to be just the right texture, though, or your noodles are either swimming in the sauce, or just one big glob! So how can you get just the right texture? Get ready to invite some friends over to taste-test. With this science activity, you can be a scientist, a cook and a crowd pleaser all at the… Read more

Marble Race – In Liquid!

STEM Activity

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Have you ever tried to squeeze honey or syrup out of a bottle at breakfast on a cold winter morning? Do you notice that it's harder to do that than on a hot summer day? As the liquid gets colder, its viscosity, or resistance to flow, increases. Viscosity is a properly of liquids that can be hugely important in wildly different applications – from how the syrup flows out of your bottle, to how blood flows through the human body, to how lava flows out of a volcano. In this project you will… Read more

More Solubility Ideas

Science Fair Project Idea

Scientific Method

A solution consists of a solute dissolved in a solvent. A solution is saturated when no additional solute will dissolve in it. Can a saturated solution of sodium chloride dissolve any Epsom salts? Can a saturated solution of Epsom salts dissolve any sodium chloride? How does solubility vary with temperature? How does solubility vary with the surface area of the solute? Design experiments to find out! (Gardner, 1999, 16-17, Stretton, 2004) Read more

Plastic Deformation: Glass Transition of Some Plastics

Science Fair Project Idea

Scientific Method

Some plastics undergo an unusual transition, from a hard, glassy state to a soft, rubbery state, with increased temperature. For this project, you should do background research on the effects of temperature on different types of plastics. Make sure that you understand the difference between thermosetting and thermoplastic polymers. You should also look for information on the glass transition temperature (Tg) for different plastics. Pure polyvinyl acetate has a Tg of 28 C (about… Read more

Polymer Permeability: Which Plastic Wrap Prevents Evaporation Best?

Science Fair Project Idea

Scientific Method

There are three different kinds of polymers used for kitchen plastic wrap: low density polyethylene (LDPE) (e.g., Handiwrap or Glad Wrap), polyvinyl chloride (PVC) (e.g., Reynolds PVC Foodservice Wrap or Boardwalk PVC Food Wrap Film) and polyvinylidene chloride (PVdC) (note: Saran Wrap used to be made with polyvinylidene chloride, but has switched to polyethylene. You will need to search for another brand that uses PVdC if you want to test it). Which of these materials is least permeable to… Read more

Salt Oscillator

Science Fair Project Idea

Scientific Method

Fill a jar a little more than half full with fresh water. Make a solution of salt water, and add a drop or two of food coloring to it. Pour the salt water solution into a plastic cup with a small hole in the bottom, and then place the cup in the jar with fresh water. (The only connection between the fresh and salt water should be via the hole in the bottom of the cup.) With the right combination of hole size and salt concentration, you will see an oscillating current develop in the jar. … Read more

Skunk Attack! Test Different Remedies to Remove Skunk Odor

Science Fair Project Idea

Scientific Method

Have you or one of your pets ever been sprayed by a skunk? Hopefully not, but if you have, you probably know that the smell can be very unpleasant and hard to get rid of. There are many "folk remedies" for getting rid of skunk scent, but if you ever do get sprayed by a skunk, how will you know which one to try? In this science project, you will test the ability of various mixtures to remove the bad scent from rags that have been contaminated with bottled skunk scent, and determine which one… Read more

Ninth Grade, Chemistry Science Experiments (165 results)

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