Any Science Fair Idea's for a 3rd grader??

Question

We are at a lost for ideas, we need something easy and cheap. We can't think of anything. The one we use will get best answer.

Answer 1

How Much salt does it take to float an egg?
Which dish soap makes the best bubbles?
Do all watches keep the same time?
What brand of raisin cereal has the most raisins?
Do the roots of a plant always grow downward?
Can plants grow without soil?
Does warm water freeze faster than cool water?
Do bigger seeds produce bigger plants?
Does sugar prolong the life of cut flowers?
Does the color of light affect plant growth?
Which brand of popcorn pops the most kernels?
Do plants grow bigger in soil or water?
How much weight can a growing plant lift?
Which brand of diaper holds the most water?
Using a lever, can one student lift an adult? (hint:think big lever)
Does sound travel best through solids, liquids, or gases?
Do sugar crystals grow faster in tap water or distilled water?
What are the effects of chlorine on plants?
What happens when you mix water, oil, and vinegar?
What happens when you mix water, oil, and sand?
How can you make glue from milk?
How can you tarnish copper (penny)?
How can you clean copper?

Answer 2

Do solutions to grow crystals. For your solute you can use sugar, salt and alum which you can get in the store for cheap (I was lucky and obtained some copper sulfate, which is a chemical)! Look online on how to make seed crystals. You use those to "seed" the growth. Then you make a concentrated solution (boil water and add the solute). Take a string and tie it around the "seed crystal" and hang it from a pencil in the solution (after it has completly cooled). Check it every day and measure and record any changes. I did this in grade 4 and went to provincials (would be the same as State science fair in the US, I'm originally from Canada).

Or you could do the effects of the growth of yogurt cultures when applied to the different temeratures of milk. Again this one took me to provincials and is really easy! all you need is milk, a pan and a candy thermometer. Look up how to make home made yogurt online. There should also be online some info on yougurt makers (they keep the milk warm so the culture can grow). FYI Yogurt culture added to hotter milk will get a sour taste and turn out watery. Yogurt added to a cooler tepmerature milk will be sweeter and thicker!

Just two thoughts to help! Both are fun and you'd be surprised about the two!

Answer 3

this is one i recommended for my third grade neighbor. it measures how color aborbs heat and how certain colors absorb more heat than others. for example, you notice that a black car always is hotter on a hot day than most other cars, but how can u prove that some colors absorb more heat than others? This Science project! what you do:

get about five or six water bottles, for however many colors you want to test, the more there are, the more accurate the outcome will be

Pick as many colors as you pick water bottles and represent the colors with construction paper or paint. cover each water bottle with a different color paper or paint it a different color.
fill each water bottle up with the exact same about of water.

Freeze them all completely.

on a hot sunny day, set all the bottles out side at the same time for the same amount of time. dont let the ice melt all the way, or too little.

once u feel you can get acurate results, measure the amount of water that was melted, dont count the left over ice, the bottle with the most water in it obsorbed the most heat!
you should probably measure in mililiters

you can obtain research by researching heat absorbtion just enough to understand how it works, your data can be a simple graph of the amount of water melted in each bottle.

this is a nice and sweet little project with an interesting outcome and its very affordable to preform.
hope this helps!! :)

Answer 4

Which way of processing foods produces the most gas: fresh, frozen, or canned?

You can try using corn or peas.

1- Mush up the same amount of each item and mix with vinegar
2- put each into 3 separate bottles.
3- Place a balloon over each one.
4- Let it sit there for days, maybe near a little near a heater to encourage rotting.

Answer 5

When I was in the third grade i did a vinegar and baking soda valcano. It's very easy made out of paper mache...Yall can also try putting an egg in vinegar and the shell will turn extremely soft like a hard boiled egg. You can research the reaction between the two very intresting..hope this helps!

Answer 6

Capillary action. It is what plants use to draw water and nutrients to their taller parts. Google easy experiments for capillary action for more sophisticated experiments, or use celery or carnations with food coloring. I prefer carnations, they are pretty. Any ways take your selection and put it in a cup that has food coloring and water, and watch capillary action at work. You will see the colored water move its way through the plants veins or capillaries! All plants use this. And it's easy and cheap! use different colors for different results.

Answer 7

How about a volcano? It is fairly common though. How about a brain or some other body part or some animal carved by vegetables. Carrots and cauliflower are good for carving. and okra is good for decorating.
Thats all I got. Sorry.

Answer 8

try to google elementary school science projects. At one time we did the dancing spaghetti but I can't remember how it was done. Good Luck!

Answer 9

when I was in elementary school I did a whole thing about spiders and then made a web out of string to explain how they created webs