Science Experiments

A variable times the same variable is called a square of that variable. For example, if the variable is x, then x multiplied by x is written as x^2, which is read as "x squared."

Producing temperatures as high as 5000 degrees Fahrenheit generally requires industrial processes, such as using specialized equipment like electric arc furnaces or lasers. Be aware that temperatures this high can pose significant safety hazards and should only be attempted with appropriate training and precautions.

BLOBS IN A BLOTTLE

The World's Easiest Lava Lamp

A clean 1 liter clear soda bottle

3/4 cup of water

Vegetable Oil

Fizzing tablets (such as Alka Seltzer)

Food coloring

1. Pour the water into the bottle.

2. Use a measuring cup or funnel to slowly pour the vegetable oil into the bottle until it's almost full. You may have to wait a few minutes for the oil and water separate.

3. Add 10 drops of food coloring to the bottle (we like red, but any color will look great.) The drops will pass through the oil and then mix with the water below.

4. Break a seltzer tablet in half and drop the half tablet into the bottle. Watch it sink to the bottom and let the blobby greatness begin!

5. To keep the effect going, just add another tablet piece. For a true lava lamp effect, shine a flashlight through the bottom of the bottle.

To begin, the oil stays above the water because the oil is lighter than the water or, more specifically, less dense than water. The oil and water do not mix because of something called "intermolecular polarity." That term is fun to bring up in dinner conversation. Molecular polarity basically means that water molecules are attracted to other water molecules. They get along fine, and can loosely bond together (drops.) This is similar to magnets that are attracted to each other. Oil molecules are attracted to other oil molecules, they get along fine as well. But the structures of the two molecules do not allow them to bond together. Of course, there's a lot more fancy scientific language to describe density and molecular polarity, but maybe now you'll at least look at that vinegrette salad dessing in a whole new way.

When you added the tablet piece, it sank to the bottom and started dissolving and creating a gas. As the gas bubbles rose, they took some of the colored water with them. When the blob of water reached the top, the gas escaped and down went the water. Cool, huh? By the way, you can store your "Blobs In A Bottle" with the cap on, and then anytime you want to bring it back to life, just add another tablet piece.

The project above is a DEMONSTRATION. To make it a true experiment, you can try to answer these questions:

1. Does the temperature of the water affect the reaction?

2. Does the size of the bottle affect how many blobs are produced?

3. Does the effect still work if the cap is put on the bottle?

4. Does the size of the tablet pieces affect the number of blobs created?

When light passes from air into glass, it changes speed and direction due to refraction. This change in speed causes the light rays to bend, which can create an optical illusion making the pencil appear bent or broken when viewed through the side of the glass.

The product of an experiment is the result or outcome that is obtained by carrying out the experiment. It represents the data, information, or findings that are generated from the experiment. This product is what is analyzed and used to draw conclusions or make decisions.

When electromagnetic waves hit an object, they can be absorbed, transmitted, reflected, or scattered. The interaction between the waves and the object will depend on the material properties of the object and the frequency of the electromagnetic waves.

When an electric current passes through water, it can electrolyze the water molecules into hydrogen gas (H2) at the cathode and oxygen gas (O2) at the anode. This process is known as water electrolysis.

Anything shiny, such as

jewelry


silverware


and glitter.


Technically, everything reflects light because if nothing did, you couldn't see anything. But basically anything that is shiny "reflects" light.

Typically you can magnetize iron or steel by exposing it to a strong magnetic field. Common "ceramic" magnets may not be strong enough, but you may need a strong rare earth magnet or a strong electro magnet.

A geographer, ecologist, or sociologist could be considered a regional scientist depending on the specific focus of their research and the region they study.

All matter (objects) produce sound when they vibrate with the frequency of audible range.

Human ears can hear the sound with frequency range of 20 Hz to 20 kHz (20000 Hertz).

So if any object vibrates within the audible range it will produce audible sound. Frequency also denotes the pitch of the sound.

If the matter or object vibrates in vacuum, then the sound waves is not heard as it needs a medium for propagation of the waves.

The loudness of the sound depends on the Energy in the waves.

When you add energy to a system, its temperature increases and the particles within it move faster. This can result in an increase in kinetic energy and changes to the system's physical state. Conversely, when you subtract energy from a system, its temperature decreases and the particles move more slowly, potentially causing changes in phase or state.

Oil or vaseline may be added to a transpiration experiment to create a seal around the stomata of the plant, preventing water loss through transpiration from the leaves. This allows researchers to control and measure the rate of transpiration more accurately by minimizing external variables that could affect water loss.

Wet surfaces are more slippery because the coating of liquid acts as a lubricant which reduces the frictional forces exerted between objects in contact. Thus, the magnitude of the forces opposing motion are lessened to some extent.

The dependent variable is the one that changes in response to the independent variable being manipulated in an experiment.

The variable that the experimenter changes or manipulates in an experimental method is called the independent variable. It is the variable that is intentionally altered to observe its effect on the dependent variable.

Alchemists performed their experiments primarily during the medieval and early modern periods, from around the 12th to the 18th century. They sought to transform base metals into noble metals like gold, discover the philosopher's stone, and create the elixir of life through their experiments.

Depends on the material itself(for conduction) or it's surface and the temperature(for radiation) - at very high temperatures(like a lightbulb filament), radiation is far more significant then conduction, but a heatsink in a normal PC is doing to be far more dependant on conduction then radiation...

Because of the heat of fusion the ice is now water

Wind turbines convert the kinetic energy in wind into mechanical energy by using rotor blades to spin a generator. The generator then converts this mechanical energy into electrical energy that can be used to power homes and businesses.

Part 3 did not contain that variable. The question wants you to say part 2 as that is the obvious answer, but it's a trick. Part 2 actually does contain that variable if you look hard enough.

But I didn't tell you that.

1. Meter (m) - length
2. Kilogram (kg) - mass
3. Second (s) - time
4. Ampere (A) - electric current
5. Kelvin (K) - temperature
6. Mole (mol) - amount of substance
7. Candela (cd) - luminous intensity

The flame of a Bunsen burner that is yellow in color will leave a black carbon residue due to the incorrect mixture of oxygen into the flame. Because there is not enough oxygen for complete combustion, the carbon reside is left behind.

When the Bunsen flame has a sufficient amount of oxygen mixed in, hence the 'roaring flame', it has a blue color and does not leave a carbon residue due to complete combustion of the acetylene gas.

Malonic acid is used in this experiment as a starting material to synthesize other compounds, such as barbiturates. It is a precursor that provides the necessary functional groups for further chemical reactions.

In Redi's experiment on spontaneous generation, the manipulated variable was the presence or absence of gauze on the jars to prevent flies from accessing the meat, while the responding variable was the presence or absence of maggots developing on the meat.