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Science Experiments
Experiments often conducted by students to test different scientific theories and hypotheses
11,111 Questions
Any machine that converts kinetic energy to electrical energy?
-- steam turbine
-- hydroelectric turbine
-- wind turbine
-- hand-crank generator
I think even the nuclear power plants do that ... they use the heat from the reactor core
to boil water, then run it through a steam turbine to generate the electric power.
What are the things in a experiment that must be kept the same called?
I think you're referring to the "control".
Read more here: http://en.wikipedia.org/wiki/Scientific_control
reactant substances usually come from groups 1 and 7 on the periodic table as it is easy to gain or lose 1 electron
A science fair project --does grass grow best in dirt or sand?
Sand has no nutrients and vitamin C but soil does.
What are the precautions for a density experiment?
- Make sure that first you weigh the object and then find its volume because if you find the volume first the object will get wet and the mass of the object will not be accurate.
- When you are using the measuring cylinder to find the volume make sure you read at eye-level and at the bottom of the meniscus.
- Always take repeated readings when finding the mass.
What will happen if you put a celery stalk in water colored blue from food coloring?
The Veins Will Turn Blue
What is a good music science fair project?
you could test your project on a mouse or your dog or cat to see how they react to it!!!!!!!♥♥♥♥
Those are interesting ones.
I suspect domestic animals are not that bothered by music though they may learn to associate it as a pure sound linked to particular individuals's presence in the house.
How music travels through the air... That's a gate into an enormous field to explore, and not really one you can do practically at home as you need some laboratory equipment, but it's a really worthwhile exercise in scientific knowledge and method. Try looking at the life and work of a 19C scientist called Helmholtz, who made a huge study of the physics of music and hearing. But beware, the major work he published is extremely mathematical! As a hint, all sounds, not just music, travel through the air in the same way... what is sound?
Music and moods... The challenge is being sure the mood change is not affected by the subject being observed! Probably the easiest start would be a survey of friends and relatives, with care that you don't influence your analysis by your own feelings towards the individuals or their tastes in music.
How do the density of wood cube and metal cube compare?
This is not a sensible question. There are many types of wood, and many types of metal. It depends which ones you pick. Balsa wood has a very low density, lignum vitae is much higher. Most woods are less dense than water (so they float) but a few are denser. Most metals are more dense than water, but a few, such as sodium and potassium are less dense. Overall, I suppose most metals are denser than most woods, but potassium is less dense than some forms of eucalyptus wood.
What is the difference of relative density versus density?
Now, let's say you have some other substance that also occupies one cubic meter but weighs 2000 kilograms. It has a density of 2000 kg/m3. In other words, relative to water, the substance is twice as dense as water. Now you have an idea of what relative density is.
If we use water as a reference, we can compare other substances' densities to the density of water. Simply divide the substance's absolute density by the absolute density of water to get the relative density of the substance (relative to water). Relative density is a unit-less quantity; it is just a number. If a substance is denser than water, its relative density will be greater than one. If it's less dense than water, it will have a relative density less than one.
Relative density is also known as Specific Gravity.
Why is it important to wear a lab coat during an experiment?
Lab coats several purposes. Aside from the psychological boost of making you look like you know what you are doing in a lab, they:
Provide another layer of protection from splashes spills and flames - being burned or poisoned is not much fun.
Can be taken off quickly if you do get something poisonous or nasty on you.
Have pockets for equipment bits, pens and paper.
Can be left in the lab at the end of the day so you don't carry poisonous things home on you normal clothes.
Are generally white so you can see where or if splashed material is on you.
Protect your clothes from damage. and if he coat gets damaged or contaminated they aare cheap enough to throw away. As in microbiology lab we encounter with different microbes and to reduce the chance of any microbial attack on us we should wear lab. coat and it is also for the culture wr are preparing so that it can also be saved a bit from contamination.
What is the function of the revolving nosepiece in the microscope?
The nose piece holds the odjective lense, rotates, and notes the positive stops for each lens.
A machine that tells you that an earthquake is coming is called?
A seismograph records an earthquake while it is happening, but as of yet there are no machines that can predict earthquakes.
Why is it important to have a fair test?
When you perform an investigation you change the independent variable to find out what the effect of the changes are on the dependent variable.
A fair test is one where you only change one variable at a time.
For example:
You are adding magnesium to hydrochloric acid to produce hydrogen and magnesium chloride.
You want to find out what effects the rate of reaction (manefested in the dependent variable as the number of bubbles produced per second).
In a fair test you use a fixed volume of acid, a fixed mass of magnesium and a fixed temperature. You then perform the investigation using different concetrations of acid. You can now state the effect of acid concentration on the rate of reaction.
You can now repeat the experiment by changing another variable and seeing how that effects the rate of reaction.
You now know what effects the rate of reaction most.
In an unfair test you change multiple things or fail to properly control the circumstances.
For example:
You perform the same test. You change the concentration of acid, the temperature and the amount of magnesium added.
You find the rate of reaction has increased.
What caused it?
You can't tell because it is an unfair test, you do not know which variable caused the change to the dependent variable.
Things that are kept from changing during an experiment?
Things that are kept from changing during an experiment are invariant.
What melts ice cubes faster sugar or salt?
You will have to do an experiment to determine the answer.
You will need to think about having equal concentrations of salt or sugar in the cubes.
The size of the molecules/particles is different.
So 100 g of salt does not have the same number of molecules/particles as 100 g of sugar. The ratio of particles is 1:4.6 for the same mass of sugar to salt.
You can see that this is not an easy question to answer.
Which melts faster if the mass of salt and sugar is the same?
Which melts faster if the number of particles is the same?
The next problem is that salt actually separates into two particles when dissolved in water, sodium ions and chloride ions whereas sugar does not.
So one salt particle is actually two ions and the ratio of particles now becomes
salt:sugar = 2.3:1 for the same mass of substances.
This sounds like a great project for someone to investigate.
What is the purpose of replicating an experiment?
because if you want to re-do it or test something, you have to do it exactly the same each time, or you're liable to get different results each time.
What are the air currents that flow near the north and south poles?
The polar easterlies (also Polar Hadley cells) are the dry, cold prevailing winds that blow from the high-pressure areas of the polar highs at the north and south poles towards low-pressure areas within the Westerlies at high latitudes.
The tip of a sharpened pencil; the pencil-sharpener; some lamps.
The tip of a sharpened pencil; the pencil-sharpener; some lamps.
The tip of a sharpened pencil; the pencil-sharpener; some lamps.
The tip of a sharpened pencil; the pencil-sharpener; some lamps.
What happen to air pressure when air is cooled?
The molecules of a gaseous form slow down, thus shrinking in volume.
As you know, molecules/atoms are in constant motion, and with temperature fluctuations, they either slow down, and compress, or they increase in speed and expand.
Ever notice that tires seem a bit flat in the winter?
Or bridges have little gaps to allow room to expand in summer months, as well as for when they "shrink" in cooler temperatures the overall structure is not corrupted.
Can a solution produced through a chemical reaction?
Yes when you carry out any chemical reaction you will have some product at the end of the reaction. The things with which you start your chemical reaction is called reactants and the things which you get at the end are the products. For every chemical reation there is a product obtained and often catalyst are also used in it.
What is the formular of water?
The chemical formula for water, liquid, solid or gaseous is the same - H2O
In some texts you will find a little cursive L in brackets to indicate that it is liquid, or a little g to indicate gas, or a little s to indicate solid.
