398
Lesson 398 of 500 · Extra Passages
⭐ 30 XPChemical Equations Part 5
📖Story Brief #398
Chemical equations are symbolic representations of chemical reactions.
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Chemical equations are symbolic representations of chemical reactions. They show the reactants, which are the substances that start a reaction, and the products, which are the substances formed after the reaction. For example, in the equation 2H₂ + O₂ → 2H₂O, hydrogen gas (H₂) and oxygen gas (O₂) react to form water (H₂O). The numbers in front of the chemical formulas indicate how many molecules of each substance are involved. Balancing a chemical equation is crucial because it ensures that the same number of atoms exists on both sides of the equation, following the Law of Conservation of Mass. In our example, there are a total of four hydrogen atoms and two oxygen atoms on each side, confirming that mass is conserved during the reaction. Understanding chemical equations helps scientists communicate the details of reactions clearly and accurately.
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Question 1
1 of 2What do the numbers in front of the chemical formulas represent?
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