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Science Experiments
Experiments often conducted by students to test different scientific theories and hypotheses
11,111 Questions
Why does a block of plastic realeased under water come up to the surface of water?
Any time a mass is less dense than the liquid it is in, it will float. Said another way, when a volume of anything weighs less than the weight of the same volume of the liquid, it will float in that liquid. This applies to all fluids and gases, including why a hydrogen or helium balloon rises in the atmosphere, and how a submarine floats or sinks by altering the amount of weight on board (by intaking or expelling water, while its volume is a constant.) The plastic floats because it is less dense than the water (less weight compared to the same volume of water).
Litmus paper turns what color in the presence of a base?
just saying that I'm 12 and i know the answer!
an acid will turn red in litmus paper or a pinkcolour.
if it is a week acid it will turn yellow or green. :)
The most difficult part of an experiment is designing an experiment that tests only one factor?
The most difficult part of an experiment is designing an experiment that tests only one factor.
What is the purpose for creating artificial life?
There is a simple answer to that question, THERE IS NO PURPOSE. Artificial life should never be created, its too dangerous! Have you ever seen Battlestar Galactica???
There are many purposes for creating artificial life. First off, human curiosity -- biologists have always speculated about the rise of life on planet Earth, and as there is yet no way to peer back in time (whether through fossils or time machines) to the dawn of life on planet Earth, we have to instead try to mimic conditions on the early Earth in order to see whether life might form.
What would the point be for having artificial life around if we've managed to create it? Time and again, human society manages to find important uses for scientific discoveries. If we ever manage to produce artificial life, we could study the differences and similarities between them and us (nothing says the life we make must be RNA based, or even Carbon-based), which would at least help the more paranoid of us defend ourselves against them.
Speaking of which, wouldn't artificial life be dangerous? That is very unlikely, Battlestar Galactica or not. Chances are any life resembling life near its beginnings on Earth would asphyxiate in the oxygen-rich atmosphere in the present day. Either way, young life would have had little time to optimize for its environment (we're talking millions of years here) and would pose little threat.
What is the role of positive control in an experiment?
a control group is a group where nothing is changed. the experimental group is where you change one factor
two examples:
experimental group: 3 cups vinegar, 1 tablespoon baking soda, 5 drops food coloring
control group: 2 cups vinegar, 1 tablespoon baking soda, 5 drops food coloring
experimental group: plants with 4 hours of sunlight, 1/2 cup water every other day, fertilizer, warm room
control group: plants with 4 hours of sunlight, 1/4 cup water every single day, fertilizer, warm room
The steps required to find a solution are usually obvious in a?
The steps needed to find the solution are usually obvious in a what: an exercise
Exercise
"Salt" is a very general term for a group of evaporites, or rocks which form through the evaporation of water. By the question, I'm assuming you are referring to common table salt, NaCl.
Salt does not absorb water. On the contrary, salt is dissolved by water into individual particles of NaCl, which subsequently are bound to the water with hydrogen bonds. The only way to retrieve salt out of solution is through evaporation, which breaks the hydrogen bonds, releasing particles of H2O and leaving behind the salt in increasing greater concentrations within the remaining water. Eventually, the water will become super-saturated with NaCl, and the salt will be deposited.
Which of the following is the dependent variable in this experiment?
The independent variable is the one that the experimenter changes, and the dependent variable is the response.
For example - if you were doing an experiment about the affect of temperature on growth rates:
Temperature = Independent variable
Growth = Dependent variable
When did human cloning first start?
1951 was when the first successful clone of a frog egg was created, though some early attempts at cloning in the 1800's were made. Hans Dreisch was the man in the late 1800's to conduct attempts at cloning a sea urchin.
Although the cloning on non-mammals was first accomplished way back in 1952, the world had to wait for another 44 years before the first mammal was finally cloned. The first cloned mammal, a sheep named Dolly was born on 5th July 1996. The birth of Dolly had established the ability of we humans to clone mammals. And being mammals themselves, this was an important milestone for the human race. In this fascinating history of cloning, a major setback came in 2003 when Dolly died at the age of six. The death of this first cloned mammal was followed by an intense debate, about the ethical issues of cloning, which continues even today.
A Brief History of Cloning
Cloning is basically the process by which a genetically identical copy of a particular bacteria, plant or animal is produced by asexual reproduction. The term 'clone', was coined by J.B.S. Haldane, an eminent Scottish biologist, in his speech entitled Biological Possibilities for the Human Species of the Next Ten-Thousand Years in 1963. The history of cloning can be traced back to 1880s, when many scientists attempted to prove how the genetic material inside the cells worked. Whilst trying to prove that the genetic material is not lost during cell division, Hans Dreisch cloned sea urchins by separating two cells and growing them independently. In 1902, Hans Spemman repeated the same process with a salamander.
History of Cloning Plants
It is very difficult to trace the timeline of cloning plants, owing to the fact that such cloning of plants has been practiced by humans, since thousands of years, and by the nature, for a longer time. Interestingly enough, there have been quite a few citations about cloning of plants in the cloning history. One such example being the cloning of a full carrot by F. C. Stewart in 1964.
The History of Animal Cloning
The first successful animal cloning experiment was executed by Robert Briggs and Thomas J. King, when they cloned northern leopard frogs in 1952. In 1962, John Gurdon used the nucleus of fully differentiated adult intestinal cells and cloned South African frogs, thus proving that a cell's genetic potential doesn't diminish as the cell specializes. In 1963, the Chinese embryologist Tong Dizhou cloned the first fish, by inserting the DNA from a cell of a male into the egg of a female. A major breakthrough in the attempts to clone animals came in the form of cloning of Dolly, the sheep, by Ian Wilmut, Keith Campbell and other scientists from the Roslin Institute in Scotland. Since then several other animals, ranging from cat and dog species to camel and Water-buffalo species have been cloned successfully. In 2009, an extinct animal species - the Pyrenean Ibex was cloned, however, it only survived for 7 minutes before becoming extinct again.
History of Human Cloning
Other than the successful attempts at cloning various animal species, the 20th century was also marked by some of the major advancements in the field of genealogy. The successful deciphering of the DNA code in 1968 came as a major boost for the much aspired human cloning. Around 20 years later, in 1988, the Human Genome, i.e. the genome of Homosapiens stored in 23 chromosome pairs, was launched. As things were working fine towards the development of a human clone, a major setback came in the form of the Human Cloning Prohibition Act of 2009, which deemed cloning as unlawful, unethical and an immoral activity. The opposition to cloning of humans came from scientific community, who were not satisfied with the results of animal cloning, as well as the religious community, which regarded human cloning to be an activity interfering with human life and procreation.
This was a brief history of cloning, spanning over a period of around 120 years. As of 2009, human cloning is considered to be illegal in 23 countries. The fraternity of pro-cloning scientists and researchers are hoping that human cloning is legalized soon, after which they can get back to their labs, and continue experiments related to the same. TALINO KO NO Hanga kau
How does a submarine change its buoyancy?
The ship floats because of its large volume which displaces an amount of water that is more than its weight. That creates an upward force called buoyant force which keeps the ship on the surface.
How do you instantly freeze water?
Aside from cooling water down as fast as possible, perhaps you are thinking of supercooling of water? If you cool really clean water in a really smooth and clean container with a minimum of vibration or disturbance, the water will cool down below freezing temperature without changing phase. All you need to do is shake it, or scratch the container side, or add the tiniest seed crystal of ice and it will freeze *almost* instantly.
The easiest way of doing this using household materials is to find a glass bottle of mineral water and put it in your freezer for a couple hours. You'll have to experiment with the time, because it will eventually freeze, which might happen rather suddenly. Commercial glass bottles are typically freshly blown, which means the inside surface is clean on a molecular level. If you don't like the mineral water available, you might try adding distilled water to a new glass bottle that has been rinsed out very carefully with no scraping or solids added. Once you supercool the water, if you carefully warm the opening on the top (it will be colder than the water and will often cause it to freeze when you pour it out), you may be able to carefully pour the water into a glass and have it instantly freeze as it pours out.
SOURCE: http://answers.yahoo.com/question/index?qid=20090410112925AAN6TFv
-Answerer: Jeff
Intelligence and hard work
What is a clever science fair title dealing with soap?
Its depends on what type of soap but if you using bath soap then you should do on what bath soap dries out faster but if it's soap you wash your clothes in then you should do it on see what what soap gets out the stain best
* Ask a Question * Do Background Research * Construct a Hypothesis * Test Your Hypothesis by Doing an Experimentn * Analyze Your Data and Draw a Conclusion * Communicate Your Results
The way light bounces off a mineral is called?
The way light bounces off a mineral is called a luster. Luster is shiny, metallic, dull, glassy or greasy. Rocks are made of minerals.
What apparatus would you need for the hydrogen test?
You do the same test as you would have done in year 7, the pop test. Invert a test tube and fill partially with the gas then place a lit match or candle at the bottom if you hear a pop you have hydrogen. just don't be like my old teacher and fill it to the point half the room catches fire. Hope this helps
Name four abiotic factors in a Prairie ecosystem?
soil, light, rainfall, fire, and surprisingly some rocks
From where did the organisms in the infusion of hay and peppercorn come from?
They are present as cysts on the surface of the infusion material. Wetting the cysts liberates the organisms, which grow, divide and re-encyst as a part of their life cycles. Many of them are present in the air we breathe as cysts as well.
Why does water dissolves faster in high temperature?
Heat gives more energy to the atoms, so they move around quicker.
Table salt is made up of what two elements?
Chemically, table salt consists of two elements, sodium (Na) and chloride (Cl). Neither element occurs separately and free in nature, but are found bound together as the compound sodium chloride.
Salt is one of the oldest and most ubiquitous food seasonings, and salting is an important method of food preservation.
The easiest way to identify slate is to break a sample. Slate will cleave very easily in one direction and form large sheets. It can often be popped off in thin layers with a chisel or a screwdriver. Shale is a similar stone, but will tend to break somewhat irregularly with ripples that cross between layers and it will be more fragile and prone to crumbling. Both have no significant grain to them, unlike other stones that break in sheets like sandstone. If you see mica or other minerals spread homogenously throughout the stone then it's not slate. Slate can be a variety of colors, most common a blueish gray, but also be greenish gray, rust brown, tan, or a purpley-brown. It may have impurities that leave colored spatters within it. Slate is very soft, and can readily be scored and polished with another stone. If mixed with a little water, the resulting slate dust will turn into clay, the sediment from which shale and slate are made.
