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5th Grade Science Fair Project Ideas

Mold Garden Experiment.

5th grade science project - bread mold.

Mold can be excellent subject for the 5th grade science fair project. There are different kinds of mold and we are dealing with them daily. Some of them are useful (think of Camembert cheese or antibiotics), some of them can be harmful causing allergy and diseases. So, yes, studying mold is important.

It's also generally very easy organisms to work with so setting up an experiment is simple and does not take a lot of time.

Check our example of the bread mold garden and suggestion for other mold experiments.

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Experiment with Yeast.

Another 5th grade microbiology project that does not require microscopy is experiment with yeast.

Yeast (Saccharomyces cerevisiae) generally indicate that they are alive and happy by producing a lot of gas. Carbon dioxide that is. It's a by-product of yeasts aerobic metabolism. People use it for dough making. In tough anaerobic (lack of oxygen) conditions yeast produce less gas and more alcohol and vinegar. Which is also useful.

Yeast use sugar as their primary source of energy, but pure sugar is rare in the nature, usually it stored in some kind of biopolymer like starch. So the goal of this microbiology experiment is to find how good yeasts are at utilizing different kinds of sugars and sweeteners. Basically answer the question, what substrates yeasts can live on and feel well? We can measure their well-being by measuring the amount of gas they produce.

You'll need


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Water Purification Experiment.

Depending on what you need there are many ways to clean the water. The simplest way is filtration with some kind of porous material (cloth or cotton in the very simple case). This kind of purification provide basic purification filtering out dust, dirt, sand and other macroscopic particles you may find in the water. It will also filter out small round worms and perhaps large single cell organisms. You would be surprised to see how many of them can be in single drop of some pond water!

However this kind of purification would not clean water from bacteria, viruses and dissolved minerals.

In this 5th grade science project we will study which purification method can better purify salted water.

At home you can use 2 methods to do that - distillation and crystallization.

You'll need

You'll need to create water distiller and water crystallizor.

Here you'll find pretty cool video that explains in details how to make a simple sun powered water distiller.

For crystallizer you'll just use a plastic bowl. Fill it with salty water and put it in the freezer. Check it from time to time. When you see that ice filled half of the bowl in the bowl, collect it and put in the clean glass. Don't wait until all the water in the bowl get frozen.

When enough water is distilled and crystallized, compare the results. You can taste the water, you can also put equal amount of water on the clean surfaces (plates, glass, polished table will work even though using polished table for experiments is not a good idea). Wait until water dries. All salts remaining in the water will stay on the surface and you can judge which water sample was cleaner.

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Soil Composition.

Does field and forest have different soil composition?

Soil composition can provide important information about agricultural potential of location, what kind of plants can grow on the soil, etc.

At home you can study soil profile, amount of water in different soils, soil salinity and pH, organisms that live in the soil.

You'll need

Find good location clear from large plants. Remove few inches from the surface of the soil and fill half of the jar with the soil from the depth of 5-6 inches. Tag your sample (write location name or number on the jar with permanent marker)

At home fill the jar with water, cover and shake it until all big clamps of soil breakup in the water. Do not shake too hard as pebbles in the soil can break the glass.

Set the jar in safe place for a few days (week is a good time). During this time all soil components will settle. First the most heavy and hard components as rocks and pebbles will set, then sand, silt, clay and finally organic remains.  When it all settled you can measure relative thickness of the layer, and compare soil composition form the different places.

What other things you can try?

Measure relative wetness of soil. Compare composition of the soil from the different depths. For example compare the composition of the surface layer, the sample of the 10 inches depth and the sample of the 3 ft  depth.

Does soil contain salts? You can put 10g of soil in 10g of water, shake it well, wait till soil settles, then filter the water and dry it. The remaining spot will contain minerals from the soil sample. At home you won't be able to accurately measure the quantity of the minerals, but you can try to judge visually which soil contains larger amount of salts.

You can also measure soil pH using red cabbage indicator or indicator paper you can buy in the garden shops.

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