ANSWER THE FOLLOWING QUESTIONS.
1.Arrange oxygen, nitrogen, carbon dioxide and argon in decreasing order of proportion in air
2. Is air a mixture or a compound?
3. Name the method by which the constituents of liquefied air may be separated,
4. Name three gaseous pollutants of air.
5. What is a catalyst?
6. What are the following called?
(a) The phenomenon in which a substance combines with oxygen giving out heat and light
(b) The reaction in which a substance adds on oxygen
7. If a diver inhales air deep under the sea, a gas dissolves in his blood, and this gas bubbles out when
he comes up. Name the gas.
8. What is the common name of solid carbon dioxide and why is it called so?
9. What happens when nitrogen dioxide reacts with water?
10. Name the gas used for filling food packages.
Answers
Answer:
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Explanation:
When a substance changes phase, the arrangement of its molecules changes, but its temperature does not change. ... Latent heat of vaporization is a physical property of a substance. It is defined as the heat required to change one mole of liquid at its boiling point under standard atmospheric pressure.
1. The major components of the air are: Nitrogen - 78% Oxygen - 20% Argon - 0.93% Carbon dioxide - 0.031% Other gases such as Neon, Helium, Hydrogen etc, are present in trace amounts.
2. Air is a mixture but not compound. Its constituents can be separated. For example: oxygen, nitrogen etc. by physical process.
3. The liquid nitrogen and oxygen are then separated by fractional distillation . The liquefied air is passed into the bottom of a fractionating column. Just as in the columns used to separate oil fractions , the column is warmer at the bottom than it is at the top.
4. The gaseous criteria air pollutants of primary concern in urban settings include sulfur dioxide, nitrogen dioxide, and carbon monoxide; these are emitted directly into the air from fossil fuels such as fuel oil, gasoline, and natural gas that are burned in power plants, automobiles, and other combustion sources.
5. A catalyst is a substance that speeds up a chemical reaction, but is not consumed by the reaction; hence a catalyst can be recovered chemically unchanged at the end of the reaction it has been used to speed up, or catalyze.
6. (a) A phenomenon in which a substance combines with oxygen and gives out heat and light is called combustion.
(b) When Oxygen is added, to a substance, it is said to be, oxidised. ... The term oxidation was originally used to describe reactions in which an element combines with oxygen. The reaction between magnesium metal and oxygen to form magnesium oxide involves the oxidation of magnesium.
7. The Bends is an illness that arises from the rapid release of nitrogen gas from the bloodstream and is caused by bubbles forming in the blood and other tissues when a diver ascends to the surface of the ocean too rapidly. It is also referred to as Caisson sickness, decompression sickness (DCS), and Divers' Disease.
8. Dry Ice is the common name for solid carbon dioxide (CO2). It gets this name because it does not melt into a liquid when heated; instead, it changes directly into a gas (a process known as sublimation).
9. Nitrogen dioxide gas reacts with water to produce nitric acid and nitrogen monoxide.
10. Gaseous nitrogen has unique chemical and physical properties that make it suitable for use in food processing.
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