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How is the identity of an element determined?

In chemistry, an element is defined as a constituent of matter containing the same atomic type with an identical number of protons. Protons, along with electrons and neutrons, are the main subatomic particles comprising an atom. Protons carry a positive charge, electrons carry a negative charge and neutrons are electrically neutral. The protons and neutrons are located inside an atom's nucleus, while the electrons freely revolve around the nucleus. The mass number, represented by "A," is the sum of the number of protons and neutrons in the nucleus.An atom's total number of proton..

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In which way is a photon of blue light similar to a photon of red light?

Colors visible to the human eye represent a small portion of the entire electromagnetic spectrum. All photons, visible or not, carry energy expressed through wavelength. The wavelength determines how the photon interacts with other elementary particles. Photons in the gamma or X-ray end of the spectrum can penetrate most matter because they possess very high wavelengths. Photons in the visible spectrum, having much lower wavelengths, tend to either reflect off matter or be absorbed by it. This property explains why humans see color as they do.\nIt wasn't until the 1960s that physicists co..

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How do you find the empirical formula of a compound from its percent composition?

Find the overall massWeigh the compound because the overall mass is needed to find the percentage of elements by weight. Masses convert to moles later in the process.Determine the chemical compositionFind the components of the compound and break them down into each element. The percentage of each element determines the ratio of molar masses in the empirical formula. Convert everything to molesUse the atomic weights of each element to convert each element to moles. Moles describe the amount of atoms in each element.Follow this exampleLook at this easy example to follow for other chemistry probl..

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How do you build a hoverboard?

The Slide hoverboard consists of a bamboo and carbon-fiber deck and shell around a core of superconducting materials cooled with liquid nitrogen. When these superconducting materials are placed in proximity to a magnetic field, an effect known as the Meissner effect causes the Slide to repel from the magnetic field and effectively hover above the ground. However, this also means that the surface where the Slide is used must contain steel bars or other magnetic elements to successfully repel the board; for instance, Lexus demonstrated the device at a specially prepared concrete skate park.\nThe..

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What is the SI unit of temperature?

In the Kelvin scale, the lowest possible temperature is 0 K. This reading is called absolute zero; however, nothing could possibly ever reach this temperature. Absolute zero, according to the Celsius scale, is approximately minus 273 degrees Celsius. Water boils at 373 Kelvin and freezes at 273 Kelvin.\nScientists discovered absolute zero when they figured that as temperature decreases, the volume of a gas also gets smaller. They graphed this relationship and found that for each substance tested, zero volume for each substance would hypothetically occur around minus 273 degrees Celsius, the eq..

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What are some examples of centrifugal force?

Centrifugal force most often occurs when a surface's friction is insufficient to cause objects situated on it to move in tandem curvature with its own curved movement. The items still possess inertia, so instead they may slide or fly in straight lines. This is observed in many everyday situations.Actions often attributed to centrifugal force:The motion of cargo in a moving vehicleThe feeling of compression experienced by passengers on spinning wheel fair ridesWater cascading over a water wheelMovement along a curved path causes unattached objects to move toward the outside of the curve. W..

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Where can you find information about wildlife scat?

Animal scat is one way to determine what type of animal has been prowling around a property. Identifying animals by scat can be done by examining different aspects of it, such as the length, width and shape. The time of day the scat was left is helpful for identification. Food particles left in the dropping helps to determine what the animal ate, giving a clue to the identification of the animal.

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What is the time constant of an RC circuit?

When the RC circuit is closed, the battery charge starts to move from one plate of the capacitor to the other, at which point the initial current is high. As the charge in the capacitor increases, the charging current decreases. The capacitor stores its charge in the electric field between its two plates.

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What is the definition of "multicellular organisms"?

The four essential processes by which a multicellular organism is made are by cell proliferation, cell specialization, cell interaction and cell movement. In cell proliferation, many cells are produced from one cell. In cell specialization, cells are created with different characteristics at different positions. In cell interactions, the behavior of one cell is coordinated with its neighbors. In cell movement, the cells are rearranged to form structured tissues and organs.

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How are organisms classified?

Kingdoms are the broadest level of classification of living creatures. Most biologists agree that organisms are divisible into six kingdoms, though earlier versions of the classification system rely on only five. The six kingdoms in the modern system are: Monera, which contains unicellular bacteria that lack nucleii, Archaea, which contains unicellular bacteria that feature nucleii, Protista, which contains unicellular organisms with plant-like or animal-like characteristics, Fungi, which contains multicellular organisms which absorb nutrients from an external source, Plantae, which consists o..

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