Question Video: Identifying the Word Equation That Represents the Fermentation of Glucose to Produce Ethanol and Carbon Dioxide | Nagwa Question Video: Identifying the Word Equation That Represents the Fermentation of Glucose to Produce Ethanol and Carbon Dioxide | Nagwa

Question Video: Identifying the Word Equation That Represents the Fermentation of Glucose to Produce Ethanol and Carbon Dioxide Chemistry • First Year of Secondary School

Yeast can be used to convert glucose molecules into ethanol and carbon dioxide molecules. How can this fermentation reaction process be described with a word equation?

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Video Transcript

Yeast can be used to convert glucose molecules into ethanol and carbon dioxide molecules. How can this fermentation reaction process be described with a word equation? (A) Glucose forward reaction arrow ethanol plus carbon dioxide. (B) C6H12O6 forward reaction arrow two C2H5OH plus two CO2. (C) Ethanol plus carbon dioxide forward reaction arrow glucose. (D) Two C2H5OH plus two CO2 forward reaction arrow C6H12O6. (E) Glucose reverse reaction arrow ethanol plus carbon dioxide.

Chemists use a variety of ways to represent chemical reactions. One of these ways is writing a word equation. A word equation represents a chemical reaction by using the names of all the species involved in the reaction. On the other hand, a chemical equation represents a chemical reaction by using chemical symbols for the species in the reaction. In both word equations and chemical equations, the reactants, or starting materials of the reaction, appear on the left side of the reaction arrow. The products, which are the new species formed during the reaction, appear on the right side of the reaction arrow. Now if there is more than one reactant or product in a reaction, then the different species are separated with a plus sign.

Let’s take a look at an example of a chemical equation. Here we can see that chemical symbols are used to indicate the identity of chemical elements. And when chemical symbols are written together, they represent the chemical formula of a compound. We can also see that there are two reactants and two products which are separated by a plus sign. Now we could also represent this chemical reaction by using the names of the substances to write a word equation, which is shown here.

Now we’re ready to use the information given in the problem to write a word equation for the fermentation reaction. Let’s focus on the first sentence in the question. We read that glucose is being converted into ethanol and carbon dioxide. Therefore, glucose is the reactant, or starting material. As glucose undergoes fermentation, two products are formed. These are ethanol and carbon dioxide.

To begin writing our word equation, we need to write glucose on the left side of the reaction arrow since it is the reactant. And on the right side of the reaction arrow, we write the names of the two products ethanol and carbon dioxide separated by a plus sign. The forward reaction arrow always points from left to right or from reactants to products. The only other type of reaction arrow we might use in a chemical or word equation is the equilibrium arrow. But this type of arrow is reserved for reversible reactions, which is not the case with fermentation. In conclusion, the word equation that best represents the fermentation reaction process described in the question is answer choice (A). Glucose reacts to form ethanol plus carbon dioxide.

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