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Science Experiments
Experiments often conducted by students to test different scientific theories and hypotheses
11,111 Questions
Does salt affect the temperature of water?
Why it does that is complex, but below is a pretty good description.
The following is taken from the site listed to the left of this answer, but that page has a lot of additional information, and this is the most important part. This is the real reason the vapor pressure of salt solutions are decreased:
"The reason dissolved solutes (such as salt) increase boiling point is that the solute must come out of solution in order for the water to boil. This costs entropy (the entropy of solution). Boiling is entropically driven, hence the reduction in the net entropy gain of boiling results in a higher temperature needed for the reaction to go. To put it without jargon: for a little packet of water with dissolved salt to turn to steam the salt atoms must, in the course of their random zooming about, ALL simultaneously leave the packet. This is not a likely event. It becomes more likely as the temperature (i.e. the average speed of zooming about) becomes higher, though, and at a certain temperature above the ordinary boiling point it becomes sufficiently likely to allow boiling in spite of the handicap. You can also see that the effect will naturally increase with the concentration of dissolved solutes (i.e. the number of salt atoms per packet that must simultaneously leave)."
Salt will increase the boiling temperature of water.
If you dissolve 1 mole (58.43 g) of NaCl in 1 kg of pure water the resulting solution will boil at 101.04°C.
Why is it hard to boil an egg on top of mount Everest?
In Charlottesville, an egg left in boiling water for 10 minutes becomes a firm, "hard boiled" egg. On the top of Mount Everest, with a height of 29,029 feet, an egg left in boiling water remains soft indefinitely. The egg fails to cook on Mount Everest because
(A) water boils at low temperature when the air pressure is very low.
(B) water boils at low temperature when gravity is weak.
(C) water has poor thermal conductivity when its pressure is very low.
(D) an egg cannot get very hot when gravity is weak.
What are biotic and abiotic componants of the forest?
abiotic factors or non living factors are like tornados wild fires droughts storms frost winter and pollution
biotic or living factors are like humans mammals insects
inserted by Kevin JHHS
How are oceans and rivers alike?
Oceans are a lot deeper, bigger and contain a lot more life in it than rivers.
What are the problems in the great lakes that deal with pollution?
. Zebra Mussels, which are a small striped freshwater mussel from NE Europe, have been steadily invading America's rivers and lakes. They can attach themselves to any surface which includes water pipes; water pipes can easily be clogged up and with a couple hundred Zebra Mussels which can cause a big problem. Zebra Mussels lay anywhere from 30,000 to 1 million eggs each year, that's a lot of Zebra Mussels! Zebra Mussels deposit pollutants as pseudo feces, pollutants of mucous mixed with particulate matter that they filter from the water. Scavenging animals that eat the pseudo feces may pass these pollutants up the food chain.
Protection of wildlife and forest?
Land purchase
- One type of forest protection is the purchasing of land in order to secure it, or in order to plant trees (
aforestation).
On site monitoring
- This involves watching over the forest to ensure nothing happens. This is usually done by cameras or patrols.
Government granting it protection
A bay is a body of water that is almost completely surrounded by land, yet still remains connected to a larger body of water. A large bay may also be called a bight, a gulf, a sea, or a sound.
What day did Lewis and Clark find the source of the Missouri River?
Lewis and Clark are famous explorers, well-known for their interactions with the Indian Sacagawea. The recording of the true source of the Missouri River was published in 1814.
What two metals will react with dilute hydrochloric acid?
Lots of metals will react with dilute hydrochloric acid; anything above hydrogen in the activity series should do so.
Conflict between religion and science in Frankenstein?
'Frankenstein; or, The Modern Prometheus' was written by the British author Mary Shelley. An integral part of the story is the creation of life by Dr. Frankenstein. Given that religious groups believe that God is the only one that can create life, it went against their beliefs and teachings.
How do you put a camera on a tripod?
Look at the base plate of your camera. There should be a threaded socket there. Your tripod will be equipped with a corresponding screw in its head plate. The industry has standardized on a screw-and-socket arrangement (it's called 1/4" x 20 if you care). All tripods and all cameras should fit one another.
Many camera sockets, and some tripod screws, are now plastic or nylon so you need to be more than usually careful not to "cross thread" and "strip" the threads in either the socket or the screw. Underneath the tripod head the screw usually has some sort of knurled handle or grip for turning it, plus a wheel. You're not going to use the wheel yet.
Using the knurled grip, back the tripod screw down until it just shows above the head plate. Position the camera's socket over the screw and gently start the screw into the socket by turning the knurled handle. If you feel resistance, back it out and try again. Any serious resistance may mean the screw is cross threaded and if you continue you risk stripping.
When you have the screw well into the socket (about 1/4" will do it), the camera will now be attached to the tripod but you'll probably notice that it "flops." This is where the wheel on the screw under the tripod head comes in. By turning the wheel up the screw under the head you tighten the base plate of the camera against the head plate of the tripod until the camera and the tripod are a single unit. Just as you must be cautious about cross threading, you don't want to over tighten the camera to the head plate. Most of these things are relatively delicate and can be damaged or ruined by too much enthusiasm. You just don't want the camera to move independently of the tripod.
A couple of tips: you can defeat the purpose of a tripod if you touch the camera while tripping the shutter for a long exposure. Use a cable release or electronic release. Don't have a cable or the camera won't accept one? Try using the camera's self timer so you're not touching it when it trips.
If your camera lacks a threaded socket, you can still support it on the tripod head by hand. It's not as good as attaching it, but it's better than no support at all for a longish exposure. On that subject, you can also steady any camera for any exposure that might otherwise "smear" by bracing or resting it on a chair, a table, a car roof, a handy railing, or whatever you can find. Bracing your elbows on anything handy may help as well.
Tripods aren't always necessary: See the related questions on tripod use referenced below.
Hati. The poor infrastructure of the buildings made whole cities collapse
How is he bounce height of a ball related to the drop height?
Yes - the greater the height an item dropped the resulting bounce is higher
Similarities between different types of electromagnetic radiation?
The similarity among these "rays" is that they are all forms of radiation, and they are all produced by nuclear activity. An alpha ray is not a ray, but is a particle. It is a helium-4 nucleus, which is composed of two protons and two neutrons. The beta ray is not a ray, either. It is an electron, which is a beta minus particle, or it is a positron, a beta plus particle (which is the antimatter equivalent of an electron).
Either the alpha particle or the beta particle emerge from the nucleus of an atom during a particular type of radioactive decay event. Different particles are produced by different decay events, as you probably guessed. Gamma rays are also produced in nuclear events.
The gamma ray is the only "real" ray here. It is a high energy photon, which is electromagnetic radiation. The other two "rays" are forms of particulate radiation.
How much weight does a tea bag lose?
A dry tea bag weighs just a few grams; much less than an ounce. When wet, however, it might weigh an ounce or so.
What is a non-foliated contact metamorphic rock called?
A non-foliated contact metamorphic rock is called a hornfels. Hornfels is called so because of its exceptional toughness and texture both reminiscent of animal horns.
5 monuments made of sedmentary rocks?
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When were the Piano's first made?
The value of a Stark piano made in Chicago dated 1945 varies. They can be worth upwards of 5,000 dollars.
A Earthquake is made by a plane or Jet and maybe a helicopter. It is a very important thing if there is an Earthquake stay inside or go under cover because there is one thing there is a Earthquake it is because an Giant Eagle comes over to Australia.
And Thank you for Reading my post I am very excited because my evil friend really got put away but anyway that is nun of your business so Thank You For Reading!
Why does the sun heat up the earth more in the summer time than winter?
Reason is simple, we know earth revolves around the sun, in the winter earth comes closer to sun in it's elliptical orbit.
The distance between the Earth and the sun during winter is more than during summer, that is reason why earth gets more energy from the sun in summer compared with winter.
Do microwaves have longer wavelengths than radio waves?
If they are travelling throught the same medium, then no. They are both types of electromagnetic waves and so they travel at the same speed (in a vacuum, that velocity is around 300,000,000 metres per second).
What must be present so that clouds could form?
Water vapor and heat must be present for clouds to form. The water is evaporated from the ground and collected into a cloud.
Which is determined by the type and arrangement of atoms in a mineral?
Mighty fine question indeed! What determines the value of a mineral is the size, shape and the weight! Good luck!
