عنوان الموضوع : بحث ماددة الانجليزية للفصل الثاني سنة 2 ثانوي
مقدم من طرف منتديات العندليب

اريد بحث الانجليزية حول تجربة علمية ارجوووكم


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>>>> الرد الأول :

اسفة حنا ما درناش هذا لبروجي.ربي يعاونك.وانتظري البقية.

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>>>> الرد الثاني :

السلام عليكم و رحمة الله تعالى و بركاته
معذرة اختي حنا ما نديروش بحوث فالانجليزية ...
وفقنا الله و ايكم

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>>>> الرد الثالث :

انا ثاني نحوس عليه
حين اكمله سأضعه لك هذا وعد

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>>>> الرد الرابع :

Make a Battery from Potato

Introduction:

Batteries generate electricity through a chemical reaction between two different electrodes and one electrolyte. Use of Copper and Zinc electrodes and Sulfuric acid as electrolyte is a proven method for this process. We are wondering if we can use any other liquid as electrolyte? This gave us the idea of using a potato as electrolyte. After all a fresh potato has a lot of juice that may serve our purpose as electrolyte.

Problem:

Can Potato be used to generate electricity?

Hypothesis:

Potato juice contains many water soluble chemicals that may cause a chemical reaction with one or both of our electrodes. So we may get some electricity from that.


Material:

For this experiment we use:
A fresh potato
Copper Electrode
Zinc Electrode
A Digital or Analog Multimeter to measure Voltage or Current of produced electricity.
Alligator clips/ Leads


Procedure:

We insert copper and zinc electrodes in to the potato, close but not touching each other. We use Clip leads to connect our electrodes to the Multimeter to measure voltage between two electrodes or current passing through the multimeter. For this experiment we removed the ****l of a broken AA battery for our Zinc electrode. (Make sure to test your multimeter by connecting its Positive and Negative wires to each other that should show no current and no voltage).


Record And Analyze Data:

A digital multimeter showed 1.2 volts between the electrodes, but the analog multimeter showed a much smaller value. In other words even though the voltage between electrodes is 1.2 Volts, the speed of production of electricity is not high enough for an analog multimeter to show the exact voltage. (Analog multimeter gets its power from our potato to show the voltage, but digital Multimeter gets its power from an internal battery and does not consume any of the electricity produced by our potato, that is why it shows a larger and more accurate value).
We repeated this experiment with some other fruits and all resulted almost the same. In all cases the produced voltage is between 1 and 1.5 volts, and in all cases they do not produce enough current to turn on a small light.
Another thing that we learned from this experiment is that creating electricity and making a battery is easy, the main challenge is producing a battery that can continue to produce larger amount of electricity for larger amount of time. By connecting multiple potato batteries you can make enough electricity to light-up a super bright light emitting diode (Included in the kit).


منقول


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>>>> الرد الخامس :

Scientific experiments
The first experiment
:
Needle floating on the surface of the water
You can float a needle on the surface of the water?
The following experiment that enables you to check it out.
Materials needed:
Cup glass.
Water.
****l needle.
Tissue.
Cleaning fluid.
Action Steps:
1. Pour the water in the cup.
2. Put the needle on tissue paper and placed gently on the surface of the water. What do you notice?
3. Apply a drop of cleaning liquid in the cup. What do you notice?
What happened?
When you put the cloth on the surface of paper towel and dive into the water longer needle floating on the surface of the water, and the password that the surface of the water act as a membrane stretched over it a needle, called this property of liquids tighten surface.
But when you put a drop of cleaning liquid in the water, the intensity of the surface will be less sinks the needle.
Scientific interest
You can a lot of small insects on the surface of the water to stand and walk by taking advantage of the phenomenon of surface tension of water
و شكرااااااااا ادعي لنا بالنجاح

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تجربة علمية عن كشف النيكوتين في السجارة
من اعداد :
I`M xXx LegeNd

The experience :
How can we search about Nicotine in cigarettes ?

The Instruments:
Plastic Bottle
& Cotton
& Cigarette
& Sulfur

The Hypotheses
We can do that by a simple experience and by using that simple
Instruments
The experience
We close the head of the bottle by the cotton then we burn the
cigarette in the head of the bottle (WP the cotton), after that we press the
bottle in order to burn the cigarette; here we observe that the cotton
is colored by yellow that substance is called «Nicotine».

The Final Results
1- When we burn one cigarette ; cotton’s color changes to yellow .
2- The cigarettes are very dangerous for mankind ‘s health because it contain poison «Nicotine


شكراااااااااا جزيلااااااااااا
على البحث ربي يوفقكم جميعاااااا

شكرا ليك اختي نوسا ربي يحفظكم
شكرااااااااااااااااااااااااااااا


[FONT="Impact"]
بارك الله فيك يااختي NOUS SAA
[/Fحقا افدتيني ششششششششششششكراااا

السلام عليكم و رحمة الله تعالى و بركاته
معذرة اختي حنا ما نديروش بحوث فالانجليزية ...
وفقنا الله و ايكم