Why solid carbon dioxide is called dry ice

Four representations chemists use for carbon dioxide. In the colored models, carbon is light gray and oxygen is red. Credit: Randy Russell (©2006 NESTA) Carbon dioxide is a colorless and non-flammable gas at normal temperature and pressure. Although much less abundant than nitrogen and oxygen in 2) is made up of one carbon atom and two oxygen atoms. Carbon dioxide is an important greenhouse gas that helps to trap heat in our atmosphere. Without it, our planet would be inhospitably cold. However, an increase in CO 2 concentrations in our atmosphere is causing average global temperatures to rise, disrupting other aspects of Earth's climate. Carbon dioxide is the fourth most abundant component of dry air. Today it has a concentration of over 400 ppm (parts per million) in the atmosphere. Before industrial activity, there was around 270 ppm in the atmosphere. Carbon dioxide levels in our atmosphere have thus risen about 40% since the start of the Industrial Revolution, which is raising global temperature. Since 1958, scientist Charles Keeling and others have measured the amount of carbon dioxide in Hawaii's atmosphere. The yearly fluctuations in carbon dioxide are due to seasonal plant growth, while the overall rise in carbon dioxide over many years is due to a combination of fossil fuel burning, deforestation, and cement production. L.S. Gardiner/UCAR Atmospheric carbon dioxide concentrations have varied substantially through Earth history, which had profound impacts on clima...

Dry ice is solid carbon dioxide (similarly to ice of water).It is called dry ice because itgoes from solid to gaseous state without going to liquid phase i.e sublimation(in which instead of solid to liquid to gas it goes through solid to gas). Uses- ACCELERATED PLANT GROWTH – A small quantity of CO 2 will increase the growth rate of plants. Allow the dry ice to sublimate in close proximity to the plants for 10-15 minutes daily. ASPHALT COOLING – Using dry ice allows for the delicate asphalt to stay at required temperatures during transport from the manufacturing plant to job site. Even more beneficial, using dry ice allows contractors to speed up the cooling process and core the paving sooner.

• Substances can exist in three states of matter - solid, liquid and gas. • Substances can change states. To change the state of a substance energy must be transferred to, or from, the substance. • Heating curves and cooling curves can be used to determine the temperature at which a state change takes place. Phew! On a hot day I just love an ice lolly. Ah or a liquid lolly. I know what’s happened here! There’s been a change of state. When a solid like my ice lolly is heated, it melts to become a liquid. And if you heat up a liquid even more, it’ll evaporate to become a gas, also known as boiling. These changes are reversible, too. When the gas is cooled, the vapour condenses to make it a liquid again. Cool that liquid down even more, and it will freeze to make a solid. Liquids can freeze and melt, or evaporate and condense over and over again, without making any new compounds or changing their mass. So, after a bit of time in the freezer, my lolly is frozen again. But have you ever wondered why this happens? Inside a solid substance, these particles have energy in a kinetic store, making them vibrate, even though they’re held in place by strong bonds. When you heat a substance, the energy in that kinetic store increases, making them move around faster and further until the bonds between the particles break. The particles can now move from their fixed positions, and the substance changes state. First from solid to liquid, then if we continue heating to raise the temperature...

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