Question

Ethanol observation while heating

Answer 1

I hope that this answer will help you. please mark me as brainliest. please. .......

Answer:

Ethanol, C2H5OH, is made through fermenting grains, such as corn. Fermentation is the

process during which decomposers break down the sugar in grains. One of the products of this

chemical change is ethanol. Ethanol has many uses, because of its properties. You have been

studying its combustibility. Because of this property, it is one of the components of gasoline. You can see on gas pumps the percentage of ethanol in the fuel. Ethanol also can kill bacteria. For this reason, it is used for cleaning to prevent infections, such as in hospitals. Another property of ethanol is that it evaporates quickly. It is found in some perfumes and colognes, because it evaporates leaving the molecules with fragrance on the skin.

Using Four Steps to Explain Combustion .

Two things are necessary to keep the ethanol flame burning: ethanol and

oxygen.

Ethanol In: All flames need a fuel and oxygen. Ethanol (C2H5OH) is a fuel

that has chemical energy stored in high energy carbon-carbon (C-C) and

carbon-hydrogen (C-H) bonds. Ethanol molecules evaporate from the

container of ethanol and enter the bottom of the flame. Evaporation is a physical change that transforms liquid into gas. When ethanol evaporates, its molecular structure remains the same.

Oxygen In: All flames also need Oxygen (O2) from the air. Oxygen also enters at the bottom of the flame. Inside the flame the ethanol and oxygen molecules come together and go through a chemical change. Let’s think about matter—the atoms. The atoms in both the ethanol (C2H5OH) and the oxygen (O2) molecules rearrange into carbon dioxide (CO2) and water (H2O). The number of atoms does not change. We can use a chemical equation to show how the atoms are rearranged:

C2H5OH + 3 O2 à 2 CO2 + 3 H2O

As the atoms in the ethanol and oxygen are rearranged, energy is released. Chemical energy is released as heat and light when the high-energy C-C and C-H bonds of ethanol are replaced by low-energy H-O and C=O bonds in carbon dioxide and water.

During combustion, the atoms in ethanol

and oxygen are rearranged into carbon dioxide and water. The carbon dioxide and water leave the top of the flame.