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Answers
2.Substance that burn in air and tend to produce heat and light are known as combustible substances. ... For combustion it is necessary to have fuel, heat and air. On the other hand, non-combustible substances are the substances that do not undergo combustion in the presence of air. For example, stone, glass, iron nails etc.
Explanation:
13.When hydrogen comes in contact with air, it reacts explosively. Hydrogen needs to be compressed at higher pressures. This process is quite hectic which causes a storage problem. ... Therefore, though hydrogen gas has the highest calorific value, it cannot be used as a fuel.
14.When fossil fuels are burned, they release nitrogen oxides into the atmosphere, which contribute to the formation of smog and acid rain. ... When fossil fuels are burned, they release nitrogen oxides into the atmosphere, which contribute to the formation of smog and acid rain.
3.Three things are required in proper combination before ignition and combustion can take place---Heat, Oxygen and Fuel.
There must be Fuel to burn.
There must be Air to supply oxygen.
There must be Heat (ignition temperature) to start and continue the combustion process.
4.Adjust your day-to-day behaviors. To reduce energy consumption in your home, you do not necessarily need to go out and purchase energy efficient products. ...
Replace your light bulbs. ...
Use smart power strips. ...
Install a programmable or smart thermostat. ...
Purchase energy efficient appliances.
5.Paraffin wax (or petroleum wax) is a soft colorless solid derived from petroleum, coal or shale oil that consists of a mixture of hydrocarbon molecules containing between twenty and forty carbon atoms. ...
Un-dyed, unscented paraffin candles are odorless and bluish-white.
6.Due to availability of different levels of oxygen, luminous flame burns with a visibly bright yellow color whereas non-luminous flames burn with light blue color. More importantly, non-luminous flames do not produce soot, burn steadily and produce more heat or are much hotter when compared to non-luminous flames.
7.Due to availability of different levels of oxygen, luminous flame burns with a visibly bright yellow color whereas non-luminous flames burn with light blue color. More importantly, non-luminous flames do not produce soot, burn steadily and produce more heat or are much hotter when compared to non-luminous flames.
8.Rapid combustion is a form of combustion in which large amounts of heat and light energy are released. This often occurs as a fire. ... Combustion is double replacement, on the other hand a chemical reaction is single replacement. Slow combustion is a form of combustion which takes place at low temperatures.
9.Solid fuel: wood , coalLiquid fuel : kerosene , petrolGaseous fuel: LPG, CNG .
10.What is the Characteristics of an Ideal Fuel.
It should have a high calorific value and a moderate rate of combustion.
It should not produce any harmful products on burning.
It should cause minimum air pollution.
It should be cheap and readily available.
It should be easy to store, transport and handle.
11.There are four major types of nonrenewable resources: oil, natural gas, coal, and nuclear energy. Oil, natural gas, and coal are collectively called fossil fuels. Fossil fuels were formed within the Earth from dead plants and animals over millions of years—hence the name “fossil” fuels.
12.Renewable energy sources are energy sources that are always being replenished. ... Some examples of renewable energy sources are solar energy, wind energy, hydropower, geothermal energy, and biomass energy. These types of energy sources are different from fossil fuels, such as coal, oil, and natural gas.
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