How is the energy absorbed in absorption spectrum positive and energy released in emmision spectrum negative ?
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Answer:
It is important to pay attention to greenhouse gases because they greatly affect the Earth's atmosphere and one may ask "How do greenhouse gases relate to chemistry?" Greenhouse gases have everything to do with chemistry! A greenhouse gas is a gaseous compound that absorbs radiation. The energy from the infrared radiation (infrared radiation discussed elsewhere on this website here) that it absorbs can then trap heat in the atmosphere and contribute to the greenhouse effect. The greenhouse effect is a natural process that warms the Earth's surface. Without this warming, the Earth would be a lot cooler. The problem with this concept in today's world is that human activities are increasing the amount of greenhouse gases. The largest contribution to this is the burning of fossil fuels. Fossil fuels are natural resources such as coal, oil, and natural gas. Fossil fuel combustion, such as from cars, is what pollutes the air. Greenhouse gases deserve a lot of attention because they can both positively and negatively affect the Earth's atmosphere. If human activities continue to have a negative impact on the Earth's atmosphere, that poses many problems in the future for both the environment and upcoming generations.
The process of the absorption of energy is quite simple. Energy from the sun is passed though the Earth's atmosphere and the Earth absorbs this energy. This absorbed energy is radiated at a longer wavelength (infrared radiation) back into the atmosphere. The greenhouse gases can then absorb some of this energy and radiate it back towards the Earth's surface. The remaining energy is radiated back into space. The energy that reaches Earth plays an important role in keeping the Earth's surface warm. For more information about absorption, please visit my page explaining absorption on this website found here.
Air is made up of mostly nitrogen and oxygen, both do not behave as greenhouse gases. The remaining gases in the atmosphere only make up about 1% of the atmosphere but they cannot be forgotten about. Although the remaining gases only make up a small portion of the atmosphere by volume, the play a big role. The pie chart below shows which gases contribute the most to greenhouse gas emission. Fluorinated gases are gases that have no natural source and come entirely from human activities. Gases such as carbon dioxide, methane, and nitrous oxide are major greenhouse gases but why? The properties of a molecule directly relate to determining whether it is a greenhouse gas or not. To determine the structure of a molecule and to know how thmolecule acts, many concepts must be known such as knowing how to draw Lewis dot structure, determining the polarity of a molecule, knowing the molecular shape and vibration, and more. All of these concepts are discussed on my website with a link to each webpage in the Navigation bar to the left. Greenhouse gases and climate change in general is a cool way to relate chemistry with something that a lot of people are aware of and it shows how closely related chemistry is with everyday life even if you may not realize it.
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