How to Write the Balanced Equation for Ethene & Hydrogen in Chemistry

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When writing an equation for Ethene and Hydrogen in chemistry, it is always very important to make sure that the equation in question is balanced. Learn how to write a balanced equation for Ethene and Hydrogen in chemistry with help from an expert in the field of chemistry in this free video clip.

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Video Transcript

Hi, I'm Professor Don Mueller, or perhaps better known as Doctor Bones. Today, I'm going to talk about the hydrogenation of ethene. The question was what is the balanced reaction for ethene with hydrogen or the hydrogenation reaction. Well it's actually balanced already. We've got an ethene molecule plus hydrogen forming ethane. So if we go to this demonstration. Let's take a look. We've got an ethene molecule. It's got a double bond between the two carbons, has two hydrogens and we've got a hydrogen molecule. Two H atoms. Now how does this reaction take place? Well you need a metal surface and in this case we've got platinum or nickel where the two in this case two molecules can absorb to the surface. So the H2 molecule and the alkene absorb stick to the metal surface. This is called chemisorption. All right. So chemisorption. In the reaction chamber, which is heated to maybe 200 degrees Celsius, this hydrogen molecule, which absorbs to the surface can dissociate. Think of the hydrogen molecule as a couple of tennis balls stretching the bond in between. It's like two tennis balls held together with rubber bands. On the surface, this molecule can dissociate. So you can form two hydrogen atoms. The hydrogen atom can them react with the alkene molecule to form an alkane. Meaning this hydrogen can react with one side of the molecule, another hydrogen with the other side of the molecule to form the ethane molecule. All right so we see here in the end the reaction side the hydrogen molecule can dissociate, leaving it available for bonding with a substrate to form the ethane molecule. And the ethane molecule which has two carbons and a single bond with hydrogens on each carbon can rotate about this axis. Now if you wanted to examine this with larger hydrocarbons, you could have double bonds in for example fatty acid molecules you could have a double bond that can add a hydrogen molecule and saturate that portion of the molecule. You might've heard of mono unsaturated fats, poly unsaturated fats. That's all that means. That double bond has now become a single bond because hydrogen was adding to the bond. All right so an interesting reaction. For more of Doctor Bones, check out my website at or Take care.


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