What type of energy is released when fossil fuels are burned?
Which form of energy was transformed to the chemical energy stored in fossil fuels?
The energy in fossil fuels (coal, oil, gas) is Chemical Potential Energy. Fossil fuels come from decayed living matter that has stored energy in its chemical bonds (bonds of atoms and molecules). Coal, petroleum, natural gas, and propane are examples of fossil fuels that store chemical energy.
What is the chemical equation for burning fossil fuels?
The general equation for a complete combustion reaction is: Fuel + O2 → CO2 + H2O.
What is the difference between burning and combustion?
1 Answer. The basic difference is that combustion is heating and no flames are produced whereas in burning most of the energy is converted to light energy and this results in less heat energy as compared to combustion.
What is the chemical formula of coal?
It contains mostly methane, a simple chemical with the formula CH4. That means there are four hydrogen atoms for each carbon atom, the maximum a single carbon atom can accommodate.
Is Coal still being formed?
Coal is the remains of plants, collected long ago in slowly sinking basins. The northern hemisphere coal deposits built up in the Carboniferous period, between about 360 and 300 million years ago. In the southern hemisphere, coal was mostly deposited in the Permian (some 300 to 250 million years ago).
What is graphites chemical formula?
Graphite (/ˈɡræfaɪt/), archaically referred to as plumbago, is a crystalline form of the element carbon with its atoms arranged in a hexagonal structure….
|Formula (repeating unit)||C|
What is the chemical name for diamond?
At room temperature and pressure, another solid form of carbon known as graphite is the chemically stable form of carbon, but diamond almost never converts to it….
|Formula (repeating unit)||C|
What is the chemical structure of a diamond?
In a diamond, the carbon atoms are arranged tetrahedrally. Each carbon atom is attached to four other carbon atoms 1.544 x 10-10 meter away with a C-C-C bond angle of 109.5 degrees. It is a strong, rigid three-dimensional structure that results in an infinite network of atoms.
Why is diamond a bad conductor of electricity?
In a graphite molecule, one valence electron of each carbon atom remains free, Thus making graphite a good conductor of electricity. Whereas in diamond, they have no free mobile electron. Hence there won’t be flow of electrons That is the reason behind diamond are bad conductor electricity.
Why do diamonds shine?
As the light moves through the diamond, it is scattered and fractured, creating the sparkle that diamonds are known for. This is the refraction. This refraction and dispersion also creates natural light and dark areas in the refracted light, depending on where the light hits along the planes of the diamond.
Are Diamonds supposed to shine?
Hold it in the light to see how it sparkles. “People have a misconception that diamonds sparkle like a rainbow, but they don’t,” Hirsch said. “They do sparkle, but it’s more of a gray color. If you see something with rainbow colors [inside the stone], it could be a sign that it’s not a diamond.”
Why does a diamond Shine Class 12?
The refractive index of the material of the diamond is such that when light enters the diamond it suffers multiple reflections. As the refractive index of the material is very high, its critical angle is very small, about 24.4 degrees. Hence the diamond sparkles when seen in the direction of emerging light.
Does diamond shine in dark?
Diamonds are Cut in such a way to maximize light, draw it in, and reflect it out so it sparkles like a billion stars in the sky. So the answer to the question is “No, Diamonds do NOT Sparkle in the dark! “ They need light (which is why Jewelry Stores have tons of it) and they need a Good Cut to really bring it out.
Why does a diamond shine more than a glass?
On comparing the refractive index of the diamond and glass we find that the refractive index of the diamond is more than that of the glass. Thus, due to this reason of more total internal reflection of the diamond than the glass the diamond shines more than a glass piece cut to the same shape.
What is the critical angle of diamond?
What is the critical angle formula?
The critical angle = the inverse function of the sine (refraction index / incident index). We have: θcrit = The critical angle. nr = refraction index.
Is critical angle always 90 degrees?
So the critical angle is defined as the angle of incidence that provides an angle of refraction of 90-degrees. For the water-air boundary, the critical angle is 48.6-degrees. For the crown glass-water boundary, the critical angle is 61.0-degrees.
How do you calculate refractive index?
Refractive Index (Index of Refraction)
- Figure 1 – Refraction of Light.
- Formula 1 – Snell’s Law. n 1 × sin(θ 1) = n 2 × sin(θ2)
- Formula 2 – Numerical Aperture. NA (numerical aperture) = n × sin(θ)
- Formula 3 – Refractive Index (or Index of Refraction) n = c/η
Why is there no refraction at a 90 degree angle?
The refracted light ray either bend towards the normal or away from the normal. If the incident light ray is incident at 900 degrees, this means that it is parallel to the normal and it cannot bend away or towards it. If the light ray doesn’t bend then refraction doesn’t occur.
Where do we use TIR?
A surgeon can see on a monitor what is happening inside a patient’s body, in real time. Optical fibres make keyhole surgery possible because the endoscope also has instruments for cutting and retrieving tissue.
What is TIR in physics?
Total internal reflection, in physics, complete reflection of a ray of light within a medium such as water or glass from the surrounding surfaces back into the medium. The phenomenon occurs if the angle of incidence is greater than a certain limiting angle, called the critical angle.