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Science Experiments
Experiments often conducted by students to test different scientific theories and hypotheses
11,111 Questions
What type of bond is formed between iodine and carbon?
Iodine and Carbon form a covalent bond. Moreover, this bond is nonpolar.
Cheers,
Caroline
- Air is separated through a process known as cryogenic distillation. The process works through various steps to separate elements from the air, one by one, through a series of columns. This process can be applied to many instances where there is a need to remove certain elements or by-products from more complex compounds.
- The first step in cryogenic distillation requires taking large volumes of air from the atmosphere. The air is compressed to approximately 94 psi where it is then cooled. As it cools, water vapor is condensed and removed. The air, still under pressure, is then passed through a filter known as a molecular sieve. This will remove compounds such as carbon dioxide and any residual water vapor.
- The now completely pure air is split between two columns. The smaller air column is cooled further by increasing the pressure and then allowing the air to decompress to pressures close to the natural atmosphere. This super chilled air is passed into the cryogenic section and will provide the extremely cold temperatures needed for separation.
- The chilled, decompressed air is passed through the main air column in a series of heat exchangers. The main air column is rapidly cooled and oxygen, as it has the highest boiling point, begins to condense to a liquid at the bottom of the tank. The remaining gas, composed of nitrogen and argon, remain above as vapor. The crude oxygen is then filtered out, cooled, and cycled through the same process of cryogenic distillation to further purify it for commercial sale.
- The nitrogen and argon vapors are siphoned out and raised to atmospheric pressure. They are then introduced into a low pressure column. The sudden expansion of pressure causes the temperature of the gases to rapidly drop. The result is a separation of the two as they have different boiling points. The lighter nitrogen will remain completely gaseous at the top of the tank while the argon will collect toward the bottom as vapor. Like the oxygen, the two gases can now be removed and further purified.
If Questioner has meant 'ethylene' glycol (1,2-ethanediol, C2H4(OH)2) then it will not be very volatile, the boiling point of 197.3 °C (470 K) at STP is quite indicative for that fact. If you compare this with ethanol (C2H5OH) with a Bp. = 78.4 °C (352 K) you can 'feel' the difference.
What is the temperature called when you purposely change the temperature to test a hypothesis?
A variable
Does an experiment need to be repeatable?
It is only science if it can be repeated, so yes, experiments do need to be repeatable in order for something to be proven.
The results of the experiment should be comperable if something is to be learned.
Why should only one variable at a time be changed in scientific experiments?
Doing so can enable you to pinpoint which independent variable had what effect on the dependent variable. If more that one variable is altered, there is no way of knowing which of them actually contributed to the change without doing further experimentation.
What is the fastest way to make an iron nail rust?
im actually about to do an art project on this. ive been researching it and it says that if you apply a solution of half hydrogen peroxide half vinegar and a pinch of salt you should get a uniform thick layer of rust in about 5 min. heating the iron will make the reaction occur faster. in order to make it stay you need to apply a finish.
What is the factor that may change in response to the independent variable?
The dependent variable may change in response to the manipulated variable.
candy dissolves when the water erodes the candy. then the molecules that are no longer a part of the large candy spread out in the water. they are invisible to the naked eye and that is why it looks like the candy disappears in the water. if there isn't enough water, the molecules will fall to the bottom of the water.
What does it mean if the experiment does not support a hypothesis?
no because the hypothesis is a guess to try and predict of what the conclusion is going to be, and it dosent matter if it dosent support the conclusion the experiment is still right
What word defines vibrations caused by an earthquake?
It is when the rocks are breaking under pressure, elastic rebound, and the forces pushing/pulling on rocks.
Is S saprophyticus mannitol fermenter?
Yes, it is slightly manitol-positive, though. It will appear a medium yellow tint and Staphylococcus aureus will contrast it by turning bright yellow. S. aureus is a better example for mannitol-positive.
See Figure 5:
http://www.microbelibrary.org/Culture%20Media/details.asp?id=2315&Lang=
What happens if you put potato in to a cup of distilled water and salt solution?
God will strike the potato core into oblivion and send it to hell.
Why are most factors held constant in scientific experiment?
because other conditions could affect the dependent variable
How did the Rutherford experiment prove the existence of the nucleus?
The Gold Foil experiment demonstrated the (at the time) surprising result that atoms had nuclei. The prevaling model for atoms at the time has been described as "grapes in Jell-O" (with electrons - "grapes" - suspended in a uniform field of positive charge, the "Jell-O"), and the alpha particles Rutherford (actually, it was his students, Hans Geiger and Ernest Marsden) was shooting at the foil were expected to pass nearly straight through with only minor deviations.
Instead, what was observed was what Rutherford described as "firing a 15-inch shell at a piece of tissue paper and having it come back and hit you," because it turns out that all the positive charge in the atom is concentrated within a very small region ... the nucleus, and the alpha particles recoiled quite strongly from this concentration of charge.
How long does it take for an ice cube to melt at 78 degrees?
it depends upon the amount and the shape of the ice.
What are some plants that you could use for your science project?
There are many plants that are used for science projects. Some projects test how well plants grow with direct sunlight as opposed to no sunlight. Some projects try to determine whether music will help plants to grow. Other projects test growing plants at different temperatures. These projects can be found at http:www.terimore.com.
You will find over 300 projects on this site many of which are about plants.
How can you improve your data accuracy in a lab experiment?
According to the scientific method, any scientific experiment must be done at least 3 times. Also, only one variable can be changed in an experiment (the independent variable). Any more changes will will ruin your dependent variable (your results) and make your data unreliable. If your experiment fails, learn from it, redo the experiment, and change another variable.
Step by step of how to do a science project?
1. Introduction = what is the project main idea or what is it a bout .
2. Hypothesis = a opinion or a believe
3. Materials = things that you use to make a project
4. Procedure -= the steps
5. Data collection = to collect in formation
6. Data analyze = collect the data and what did you get form all the data
7. Conclusion = the summarize
8. Questions
What process assures that claims made by scientists are reliable?
Reproducibility is the major method for other scientists to confirm the work of one scientist. When one scientist does an experiment, s/he publishes the results so other scientist can read and verify the results. If similar results are obtained by verification, then the results are partially confirmed.
What is the measurements and observations collected during an investigation are called?
You think probable to a determinatiom.
Whats an example of a physical property?
- density - ratio of mass to its volume
- boiling point - temp. at which liquid begins to change to a gas
- melting point - temp. at which solid changes to a liquid
- solubility - extent which a substance dissolves in a particular solvent
- specific heat - amt. of heat required to raise the temp of a substance 1 degree
- color
