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Science Experiments
Experiments often conducted by students to test different scientific theories and hypotheses
11,111 Questions
Why does solid iodine not stick to fingerprints?
iodine is a covalent compound and no ionic properties. there are no free electrons on it. so it can not conduct electricity.
How many atoms of each element in NH3?
Ammonia's chemical name is NH3, so the eleents found in it are
1 atom of Nitrogen & 3 atoms of Hydrogen.
Hope that hepls! :P And ammonia is used for cleaning...
Why does mold grow faster on bread soaked in milk?
Because milk has lactose which is a type of sugar. It also adds moisture. Both sugar and moisture are needed for mold to grow.
The relationship between size of current in a wire and its heating effect is very simple :- Heating is proportional to the square of the current. The actual heating depends also on the resistance of the wire. W=I2R ( I is current in Amps, R is resistance in Ohms , W is heat output in Watts. ) (Note: The Watt is strictly unit of power. That is to say the rate that energy is transfered or used at. The Joule is a unit of energy equivalent to roughly the amount of mechanical work done when a 1kg mass is lifted 9.8cm. The Watt is the number of Joules expended per second.) For AC current this relationship gives an instantaneous value for the power. To get the average power you need to use the RMS value. (Peak value divided by the square root of two.) The above relationship holds true for all cases, but the wires resistance will change with temperature. In practice this means the equation must be applied for the wire in thermal equilibrium with it's environment. IE when the rate of heat output equals the rate of energy input. That is, it's working temperature. The way a material changes resistance with temperature can be quite complex and depends on the material, but for metals the resistance increases linearly with temperature. How much is given by the temperature coefficient of electrical resistance for the particular metal. This gives the amount that the resistance changes proportional to the change in temperature as a fraction of the original resistance.
Answer
It's work, not heat, that's proportional to the square of the current passing through a resistance. The amount of heat depends on the temperature difference between the resistance and the surrounding atmosphere.
A force that is created by charges or charge motion.
AnswerAn electromotive force, by definition, is the open-circuit ( or 'no-load' ) potential difference created by charge separation within devices such as chemical cells, generators, etc.For a loaded circuit, the electromotive force of a source (by Kirchhoff's Voltage Law) is numerically equal to the algebraic sum of all the voltage drops around circuit, including any internal voltage drop within that source.
Another AnswerElectromotive force is not a force. It is a traditional term used by physicists and engineers which is synonymous to a potential difference which charges travel through. Historically, it was initially believed that this force was provided by the inert characteristics of the potential. When this traditionally held standard was tested against clear and concise scientific data, gathered through careful experimentation, it is a generally accepted fact that the voltage ( or potential difference) is NOT a force.Which gas will cause rainwater to have a pH of 6.0?
A PH of 7 is neutral, a PH falling below this means that the water is acidic. Carbon dioxide and SO2 are common gases found in the air which, when when dissolved in rainwater, will cause it to become acidic and thus lower the PH.
What is an everyday example in which you observe a gas expanding when heated?
Example of thermal expansion:
Spaces or gaps left between rail lines. The reason is that the movement of trains exerts a huge pressure on the rails, this shows up a rise in temp. in the rails made up of Fe .So, the rail expands because of θ. [ rise in temp.= θ]
What are the 2 types of variables you use in an experiment?
Isn't one control
I don't know ask a teacher
What is the most complex phenomenon?
The most complex phenomenon is Light.
And as a biologist, life on earth itself a complex phenomena.
Low pressure sodium lamps emit a specific wavelength of yellow light. Objects that reflect or absorb other wavelengths of light will appear as different shades of yellow under this light source. Colors that do not have any yellow component in their spectrum may appear different shades of gray or black.
Why does sand not dissolve in sea?
Sand, or silicon oxide, is fairly inert. It does not dissolve in water. Sand is mostly the same material as glass. So it does not dissolve any faster than glass dissolves in cold water.
Hydrofluoric acid is, however, another matter.
a means of solving a problem or dealing with a difficult situation or a liquid mixture in which the minor component (the solute) is uniformly distributed within the major component (the solvent).
Can you give me a science project for a 6th Grader?
A good science project for a 6th grader would be about magntism, like does the bigger the magnet mean the gravitational pull will increase if you try to pick up bigger things than that.
it is used for fending of staurt beck and killing your enimies.
What is suspension in geography?
Suspended particles mean a tiny particles in the solvent that does not settle under gravity and spread through out the solvent.
They take lot of time to settle. If we use centrifugal machine we can create external force in addition to Gravitational force to bring down suspended particles in water.
What is a science safety rhyme?
There are a number of different rhymes you could use to teach science safety. You could say that in order to be safe in your classes you must wear protective glasses for example.
Why does mold grow on fruit and bread?
Wheat bread is healthier than white. The Wheat and different ingredients in the bread make the mold grow slower than how it grows on white.
2nd Answerer says:
That was someone else above, but I know that they are pretty equal, white has a lot of moisture, but wheat also has the nutrients that nourishes the mold, making it mold faster than other refined breads. I've been doing a lot of research on mold and bread for a science project and that's what i learned.
What is the equivalence point in an acid base reaction?
The equivalence point, also known as the stoichiometric point, of a chemical reaction is when a titrant is added and is stoichiometrically equal to the number of moles of substance, known as analyte, present in the sample: the smallest amount of titrant that is sufficient to fully neutralize the analyte.
If your 6th grader is studying the weather, how about this idea from the Boy Scout merit badge book: Make one of the following instruments: wind vane, anemometer, rain gauge, hygrometer. The library or a good encyclopedia should have directions for making one of these. Keep a daily weather log for 1 week using information from this instrument as well as from other sources such as local radio and television stations or NOAA Weather Radio, and Internet sources (with parent's permission). Record the following information at the same time every day: wind direction and speed, temperature, precipitation, and types of clouds. Be sure to make a note of any morning dew or frost. In the log, also list the weather forecasts from radio or television at the same time each day and show how the weather really turned out.
Do your results have to match your hypothesis in an experiment?
The results of a science experiment do not have to match the original hypothesis. Indeed, the results collected in an experiment may be completely different to those that the scientist predicted.
Example of high friction is a really rough surface like sandpaper.
