We all know that when the oxygen in air combines with carbon and hydrogen in fuel,fire is lighted...
so, when we light up a matchstick with the help of the that brown side of a matchbox fire is lighted.. So, here what is the fuel? .Explain how this process works in the matchbox example..
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Answers
Answer:
In case of matchstick it's tip has potassium chlorate and it's body is made up of wood. When we rub tip of matches with brown side heat energy is generated and the fuel attain it's ignition temperature and starts burning.
Answer:
Besides pedagogy or psychology, it can be also relevant just to get the facts right. The Water-Candle experiment is an illustrative example. It is a situation where many different effects play together and where it is hard to figure out which ones really matter. My own perspective about this experiment has shifted several times and comments of some who wrote me added valuable insight. Please look also towards the end of this page where some interesting links are added and information like why the great Lavoisier himself replaced the experiment since it was too subtle.
Explanation:
Experiment: Cover a burning candle with a pitcher so that the candle is in an air-tight room sealed by the water at the ground.
Observations: After some time, the candle dims and goes out. Just before the candle dies, the water level rises to almost 1/10 th of pitcher height. No air bubbles are seen. The water level stays up for many few minutes more.
The chemical aspect: oxygen O2 and paraffin Cn H2n+2 react. The burning produces water H 2O and carbon dioxide C O 2. For n=1 we balance the equation as follows:2 O2 + C H 4 = C O 2 + 2 H 2 OBecause twice as much oxygen is burned than carbon dioxide released, the air volume decreases.
The physical aspect: the candle heats the air and expands it. This cancels the depletion of the oxygen temporarily and the water level stays down. When the oxygen is depleted, the candle goes out and the air cools. The volume of the air decreases and the water rises. The temporary temperature change delays the rise of the water. As several readers have pointed out, also the water condensation should be mentioned. While water is initially gas, it condenses and helps to delay the effect.
Summary: There are two different effects. Both a chemical and a physical reasoning are needed to explain what we can see. Both physics and chemistry matter. The initial cancellation effect can confuse the observer. Mathematics plays a role when the chemical equations are balanced.