chemical equation

简明释义

化学反应

英英释义

例句

1.To predict the products of a reaction, you must first write the correct chemical equation 化学方程式.

要预测反应的产物，您必须首先写出正确的化学方程式 chemical equation。

2.The chemical equation 化学方程式 for photosynthesis shows how plants convert sunlight into energy.

光合作用的化学方程式 chemical equation展示了植物如何将阳光转化为能量。

3.A chemical equation 化学方程式 can be used to represent both the reactants and the products in a chemical reaction.

一个化学方程式 chemical equation可以用来表示化学反应中的反应物和产物。

4.In chemistry class, we learned how to balance a chemical equation 化学方程式 to ensure the law of conservation of mass is followed.

在化学课上，我们学习了如何平衡一个化学方程式 chemical equation以确保遵循质量守恒定律。

5.Balancing a chemical equation 化学方程式 is essential for accurate stoichiometric calculations.

平衡一个化学方程式 chemical equation对于准确的化学计量计算是必不可少的。

作文

A chemical equation is a symbolic representation of a chemical reaction. It shows the reactants, which are the substances that undergo change, and the products, which are the substances formed as a result of the reaction. Understanding chemical equations is essential for anyone studying chemistry, as they provide a concise way to convey complex information about chemical processes. For example, when hydrogen gas reacts with oxygen gas, it forms water. This can be represented by the chemical equation: 2H₂ + O₂ → 2H₂O. In this equation, the numbers before the chemical formulas are called coefficients, indicating the number of molecules involved in the reaction. The left side of the arrow represents the reactants, while the right side shows the products. This format not only helps chemists communicate effectively but also allows them to predict the outcomes of reactions under various conditions.Another important aspect of chemical equations is the principle of conservation of mass, which states that matter cannot be created or destroyed in a chemical reaction. Therefore, the number of atoms of each element must be the same on both sides of the equation. This means that when writing a chemical equation, it is crucial to balance it properly. For instance, in the reaction between sodium and chlorine to form sodium chloride, the unbalanced equation is Na + Cl₂ → NaCl. To balance it, we write: 2Na + Cl₂ → 2NaCl. This balanced chemical equation ensures that there are two sodium atoms and two chlorine atoms on each side of the equation.The study of chemical equations extends beyond just balancing them; it also involves understanding the types of reactions they represent. There are several categories of reactions, including synthesis, decomposition, single replacement, double replacement, and combustion. Each type has its own characteristics and can be identified through its chemical equation. For example, a synthesis reaction occurs when two or more reactants combine to form a single product, such as in the formation of ammonia: N₂ + 3H₂ → 2NH₃.Moreover, chemical equations can also indicate the states of the reactants and products, such as solid (s), liquid (l), gas (g), or aqueous (aq). This information is vital for understanding the conditions under which a reaction occurs. For instance, in the reaction of acetic acid with sodium bicarbonate, the chemical equation is CH₃COOH(aq) + NaHCO₃(s) → CH₃COONa(aq) + CO₂(g) + H₂O(l). Here, we see that acetic acid and sodium bicarbonate are in aqueous and solid states, respectively, while carbon dioxide is released as a gas.In conclusion, mastering chemical equations is fundamental for anyone pursuing a career in science, particularly in chemistry. They serve as a universal language that allows scientists to communicate their findings succinctly and accurately. By learning how to write, balance, and interpret chemical equations, students can gain a deeper understanding of the chemical reactions that govern the world around us. This knowledge not only enhances academic performance but also lays the groundwork for future scientific endeavors, whether in research, industry, or education.

化学方程式是化学反应的符号表示。它显示了反应物，即经历变化的物质，以及产品，即反应结果形成的物质。理解化学方程式对于任何学习化学的人来说都是至关重要的，因为它们提供了一种简明的方式来传达有关化学过程的复杂信息。例如，当氢气与氧气反应时，它形成水。这可以通过化学方程式表示：2H₂ + O₂ → 2H₂O。在这个方程中，化学式前面的数字称为系数，表示反应中涉及的分子数量。箭头左侧代表反应物，而右侧则显示产品。这个格式不仅帮助化学家有效沟通，还使他们能够预测在各种条件下反应的结果。化学方程式的另一个重要方面是质量守恒原理，该原理指出，在化学反应中物质不能被创造或消灭。因此，每种元素的原子数量在方程的两侧必须相同。这意味着在写化学方程式时，正确平衡非常重要。例如，在钠和氯反应形成氯化钠的反应中，未平衡的方程是Na + Cl₂ → NaCl。为了平衡它，我们写：2Na + Cl₂ → 2NaCl。这个平衡的化学方程式确保每边都有两个钠原子和两个氯原子。对化学方程式的研究不仅限于平衡它们；还涉及理解它们所代表的反应类型。反应有几种类别，包括合成、分解、单替换、双替换和燃烧。每种类型都有其特征，可以通过其化学方程式识别。例如，当两个或多个反应物结合形成单一产品时，就发生了合成反应，如氨的形成：N₂ + 3H₂ → 2NH₃。此外，化学方程式还可以指示反应物和产品的状态，例如固体（s）、液体（l）、气体（g）或水溶液（aq）。这些信息对于理解反应发生的条件至关重要。例如，在醋酸与碳酸氢钠反应中，化学方程式为CH₃COOH(aq) + NaHCO₃(s) → CH₃COONa(aq) + CO₂(g) + H₂O(l)。在这里，我们看到醋酸和碳酸氢钠分别处于水溶液和固体状态，而二氧化碳以气体形式释放。总之，掌握化学方程式对于任何追求科学职业的人来说都是基础。它们作为一种通用语言，使科学家能够简洁而准确地交流他们的发现。通过学习如何书写、平衡和解释化学方程式，学生可以更深入地理解支配我们周围世界的化学反应。这种知识不仅提高了学业表现，还为未来的科学事业奠定了基础，无论是在研究、工业还是教育领域。