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Science Experiments

Experiments often conducted by students to test different scientific theories and hypotheses

11,111 Questions

What is focal length of a door peephole's lens and is it concave or convex?

The lens in a door peephole is a convex lens with a very short

focal length, giving it a wide field of view. If it were on a camera,

it would be called a "Fisheye lens".

What experiments led Guillaume Duchenne to conclude that there were two types of smiles?

he found out scientists were helping people with brain damage and saw the cingulate cortex and the motor cortez parts of the brain. . .

Does correlation demonstrate causation?

NO.

correlation just (implies) a relationship ... for example,

both may be caused by the same thing.

What is the purpose of closeness in a moss?

I think many tiny moss plants together gathers water and keeps it from evaporating

What is Sweep wave?

A sweep wave refers to a sound wave that increases or decreases in frequency continuously over time. This type of wave is commonly used in electronic synthesis and audio effects to create a sweeping or swirling sound effect. Sweep waves can add dynamic movement and texture to music or sound design.

Ethical problem that Little Albert has?

There were many ethical problems with the Little Albert study.

Firstly, it was clearly a case of harm to the participant. Albert was consistently made to experience a loud clanging, and ultimately it drove him to feel extreme fear.

Secondly, there was not informed consent as Albert was still very young.

Thirdly, the right to withdraw was under question as, even as Albert became distressed with the experiment, it continued.

Why do you need electromagnets?

pick things up

Another AnswerElectromagnets are necessary for an electric motor to work. Electromagnets are used in ink jet printers to release ink, they activate relays and solenoids. Electromagnets are inside automotive fuel injectors. The old CRT televisions wouldn't work without some high powered electromagnets. Computers would be useless without electromagnets that operate disk drives and relays.

Electromagnets are an essential part of all transformers.

Essentially, modern technology would come to an end without electromagnets.

Can you use a salt saturated solution for dissolving ice?

Yes, a salt-saturated solution can be used to melt ice because the presence of salt lowers the freezing point of water. This causes the ice to melt at a lower temperature than 0°C, making it an effective method for de-icing surfaces.

Is it possibile to see a double band on a SDS page. And why is that?

SDS page resolve the proteins in the sample based on their molecular mass and the negative charge(and shape). if your sample has two proteins sure you can see two bands. if they are degraded by a unspecific protease during sample preparation it shows more than two bands. Same applies when you run "n" proteins, you can detect "n" number of bands.

Does changing a gas to a liquid require heat?

Changing a gas to a liquid (condensation) typically releases heat, allowing the gas molecules to slow down and come together to form a liquid. This process involves removing energy (heat) from the gas molecules to make them transition into a liquid state.

What if you mix a man DNA with a cheetah?

The offspring will be a typical North-European politician.

That's fortunately a joke.

Man and Cheetah DNA are too different for them to produce offsprings.

Examples of Dependent and independent variables?

Independent Variables are changes that occur in an experiment that are directly caused by the experimenter (you.)

Dependent Variables are changes that occur due toindependent variables.

A Controlled Variable is anything else that could influence the dependent variables.

Two kinds of observations?

I know the answer..but I only know the one kind of observation and that's QUALITATIVE OBSERVATION..

Catchy phrases for Saturn?

One catchy phrase for the plant Saturn could be 'Saturn, the one with the rings'. Saturn is the planet that have several rings around it.

What is the main differences between the properties of engineering ceramics and traditional ceramics?

The short answer is that technical or engineered ceramics have optimized properties along one or more characteristics so that they better fit the application.

Traditional ceramics are characterized as typically a vitreous bond based system. This limits the application of traditional ceramics in high strength, high fracture toughness, high temperature applications. The glass bond is the limiting parameter. Also traditional ceramics are limited to the oxide forms of metals which rules out carbide, nitride and other exotic molecules.

Triaxial porcelains is the most widely produced traditional ceramic. It is the basis for the majority of every day items from house wares through sanitary ware. It is produced from blending common clays, Kaolin, Ball Clay and Feldspar and Flint to yield a high quality material that serves as an excellent foundation for a wide variety of products.

Engineered Ceramics are typically formed from high purity materials and primarily depend on sintered bonds. Glass if it is present is intentionally designed into the system.

Materials such as Silicon Carbide can be fabricated to take advantage of a variety of its unique properties. The material can be blended to produce heating elements because of its electrical conductivity. It is formed to make refractories because of its resistance to melting at high temperature. It is also used as a cutting material because it is almost as hard as diamond.

Zirconium Oxide can be blended with other oxides such as Yttrium Oxide to produce materials with high fracture toughness as well as oxygen sensors.

Aluminium Oxide is the base for a wide variety of products from electrical applications where its low resistance is crucial to polishing applications where its abrasiveness is desirable.