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  #1  
Old 11-15-2005, 07:37 AM
butterfly butterfly is offline
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Default Help Required!

Dear mad scientist,

I like anything related to chemistry. Last year, my science project earned the first place, but this year, I would like to have something as good but related to 8th grade chemistry.

I'll be so grateful if you gave me an idea about such a science fair project.

Sher
Saudi Arabia
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  #2  
Old 11-16-2005, 10:10 AM
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brainygirl brainygirl is offline
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Post Effect of Acids and Bases on the Browning of Apples

I'm not mad scientist , but i think i can help.

Gather Materials

The following materials are needed for this exercise:

Five slices of apple (or pear, banana, potato, or peach)
Five plastic cups or other clear containers
Vinegar (or dilute acetic acid)
Lemon juice
Solution of baking soda (sodium bicarbonate) and water (you want to dissolve the baking soda. Make the solution by adding water to your baking soda until it dissolves.)
Solution of milk of magnesia and water (ratio isn't particularly important - you could make a mixture of one part water one part milk of magnesia. You just want the milk of magnesia to flow more readily.)
Water
Graduated cylinder or measuring cups

Procedure::

Label the cups:
Vinegar
Lemon Juice
Baking Soda Solution
Milk of Magnesia Solution
Water
Add a slice of apple to each cup.
Pour 50 ml or 1/4 cup of a substance over the apple in its labeled cup. You may want to swirl the liquid around the cup to make sure the apple slice is completely coated.
Make note of the appearance of the apple slices immediately following treatment.
Set aside the apple slices for a day.

Observe the apple slices and record your observations. It may be helpful to make a table listing the apple slice treatment in one column and the appearance of the apples in the other column. Record whatever you observe, such as extent of browning (e.g., white, lightly brown, very brown, pink), texture of the apple (dry? slimy?), and any other characteristics (smooth, wrinkled, odor, etc.)
If you can, you may want to take a photograph of your apple slices to support your observations and for future reference.
You may dispose of your apples and cups once you have recorded the data

As for your results
What does your data mean? Do all of your apple slices look the same? Are some different from others? If the slices look the same, this would indicate that the acidity of the treatment had no effect on the enzymatic browning reaction in the apples. On the other hand, if the apple slices look different from each other, this would indicate something in the coatings affected the reaction. First determine whether or not the chemicals in the coatings were capable of affecting the browning reaction.


If you need more info you can try [url]www.about.com[/url]

Good luck!
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"Your faith in yourself is all you will ever have. Don't let anyone take it away from you ever."
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  #3  
Old 12-15-2005, 02:38 PM
smartypants girl smartypants girl is offline
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Unhappy H.e.l.p Help!

i NEED HELP! please if any body that mean you help me i need to do some heating project before tomorrow so pleasssssssse help meeee!
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  #4  
Old 12-15-2005, 02:44 PM
smartypants girl smartypants girl is offline
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Cool Thanks

thank you.YOUR'E a life saver



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  #5  
Old 12-30-2005, 02:33 PM
punk/girly_girl333 punk/girly_girl333 is offline
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so whats up what do you need?
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  #6  
Old 12-30-2005, 02:36 PM
punk/girly_girl333 punk/girly_girl333 is offline
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Smile

smarty pants girl are you there?
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  #7  
Old 01-03-2006, 10:07 AM
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dragon_kid dragon_kid is offline
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you could try and make rain...
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