Science Experiments

fingerprints

1.

John Dalton

1803-8

Atomic theory from chemistry

2.

Humphrey Davy

1807

Electric separation of Sodium

3.

Amadeo Avogadro

1811

Atoms and the laws of gases

4.

Michael Faraday

1833

Laws of electrolysis

5.

Stanislao Cannizzaro

1860

Rediscovery of Avogadro's law

6.

Henri Becquerel

1895

Radioactivity

7.

J.J. Thompson

1897

Discovery of electrons

8.

Ernest Rutherford

1911

Discovery of compact nuclei

9.

Robert Millikan

1913

Measurement of electron charge

10.

James Chadwick

1932

Discovery of the neutron

11.

Hans Bethe

1938

Sun powered by Nuclear Fusion

It depends on the two materials involved.

The underlying question here is what affect does temperature have on density -- because it is the relative density of an object that will determine whether it sinks or float in a liquid. Most often, the density of a material goes down with increasing temperature (in other words buoyancy goes up with temperature) -- but that is not always the case. Water is most dense at 4°C for instance, which is why ice cubes float. For any common material, it is trivial to find a graph of density versus temperature (try google.com for instance). The lower the density, the more buoyant it will be (it won't be buoyant at all in water if the density is above 1 gram/cm3 though).

it means that when your experiment doesn't go according to plan and it doesn't work, you just keep on trying until you succeed. You can learn new things from experiments that didn't work out well

Henry Cavendish was a British scientist born on October 10, 1731. He is credited with discovering hydrogen, which he called inflammable air.

Answer

According to the scientific method, scientists perform an experiment.

Answer

for cleaning the pans of different types of balances and used in getting liquid by means of measuring pipette.

Insoluble solid materials are materials in solvents that are carried in them in suspension rather than solution. Suspended materials can come out of suspension, can precipitate, under certain conditons. The best example on a large scale may be a river. It carries stuff in it in suspension, and some have so much insoluble solid material in them they look brown. But near the mouth of the river, the insoluble material, this silt, can precipitate out and form a delta. The actual insoluble material can vary over an extremely wide range of "stuff" depending on what solvent and where we're looking at it. In the lab, we'd have a good chance of knowing what the insoluble solid material was by looking at our experiment. In the lab, we have to deal with both a suspension and a colloid. Both have a fluid solvent that "holds" the finely divided materials, but in a suspension, the material can precipitate out. In a colloid, like milk, the particles in it won't precipitate. Chemistry and geology (hydrology, a sub-specialty), address the nature of insoluble solid materials in the course of study.

The freezing rate in order of fastest to slowest would be: tap water, bottled water and then salt water. Although it's a toss up between bottled water and tap water. The more sodium content of a solution, the slower the rate of freezing. In fact, a supersaterated sodium solution has to have a temperature of -21 degrees Celsius in order to freeze. Any temperature above that, will cause the salt to melt the ice. That is why they use use salt on icy roadways in the winter. If the ambient temperature is below -21 degrees celsius however, ice on the roads won't help. So salt water would be the last to freeze. Why did I say tap water before bottled water? Bottled water usually, but not always, comes from natural springs. Although some people prefer this water over tap water, spring water can contain minerals, such as sodium (salt), calcium, which can slow the rate of freezing, unless the temperature is low enough. Tap water is wastewater that has been treated with chemicals (such as chlorine) and and filtered prior to it being sent to your home. The addition of these chemicals shouldn't slow down the rate of freeze and that's why I said it's a toss up between bottled and tap water. The difference in chemical make-up shouldn't interfere with the freeze rate, especially in a home freezer. Note that water at room temperature tends to freeze slighlty faster then cold water in a home freezer.

Hypothesis .

Oxygen (O2)

when the confederates were more attractive

it seeks out the bacteria and kills of the bacteria and leaves a coat to stop it from growing back for a few hours. also connor rapley is from bargo and is a retard

start by putting soil a drainer. then but the drainer over a bucket . then poor water in the soil slowly . if there is water in the bucket the answer is no . but if there is no water in it the answer is yes .

Rutherford's experiment with the gold foil was done by his assistants, Geiger and Marsden. (We gotta give 'em their props. The experiment, by the way, carries the names of those two guys. They did the work.) Let's check it out. An alpha source was set up. Alpha particles are helium nuclei, two protons and two neutrons. A shielded block with a hole in it served as the source. Radon was put inside. The hole acted as the only means of escape for the alpha particles. The hole was pointed at the foil. The foil was set up a short distance from the source, and in a line with the opening in the shield block. (They needed to "aim" the source at the foil.) Using the foil as the center of the collision or scattering events, they took a long strip of material that was coated with zinc sulfide and set it up in an almost complete circle. Now they had an "arena" for the event with the target at the center and the little strip of scintillant material around it. They turned off the lights. That way they could see the scintillations, the little blinks of light that resulted when an alpha particle hit the screen. Remember that they are looking at the screen and not the target. They expected all the particles to go right through the target, but they noticed some reactions along the sides. Not many or often, but they were there. Hit the links for the diagrams.

fantasy

an electric circuit consists of a voltage source (like a battery), something to use up some of the voltage to keep it from short circuiting ( like a light bulb or a motor), and wires to connect the positive end of the battery to the light bulb or other device, then more wire to connect the other part of the bulb to the negative end of the battery.

1.

Which project is your favorite? Why?

2.

Explain which project you would like to try at home?

3.

Which project should win the Grand Champion Award? Why?

4.

Which project do you think could change the world? How?

5.

Which project won the Microscopy Award?

6.

What did you like most about the Science Fair at BYU?

7.

Which project do you think was the most creative? What made it so?

8.

Which project was the most decorated? What was special about it?

a comet/meteorite

Kingdom Fungi has characteristics that identifies it. The organisms in this kingdom are eukaryotic, heterotrophic, reproduce by means of spores that might be asexual or sexual and they are non-vascular.

4 oz is an inappropriate measurement in a science experiment because it is not an SI (System International) unit. The SI unit for mass is the kg.

There are two things that must join to make a seed. The zygote, or embryo, must join with the ovule.

Radius of rings is directly proportional to the square root of the radius of curvature. Thin lens would have larger radius of curvature and hence the option

it doesnt have tobe very long, only about as big as the hypothesis

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about 2 paragraphs - make sure you include everything you need to - the results, why you think the results came out like they did, do they match your prediction (if you did one), how you could improve next time, and anything else you've been asked to include

The Independent Variable (I.V.) is what the scientist changes. The Dependent Variable (D.V.) is the outcome of the I.V.

There can only be one I.V. in a controlled experiment if you want accurate results