chemical test

简明释义

化学试验化学分析

英英释义

例句

1.A chemical test can reveal the presence of heavy metals in water samples.

一个化学测试可以揭示水样中重金属的存在。

2.The laboratory conducted a chemical test to determine the acidity of the solution.

实验室进行了一个化学测试以确定溶液的酸度。

3.Before the product launch, we need to perform a chemical test on the new formula.

在产品发布之前，我们需要对新配方进行一个化学测试。

4.To ensure safety, all food products must undergo a chemical test for harmful substances.

为了确保安全，所有食品产品必须经过一个化学测试以检测有害物质。

5.The chemical test showed that the soil was contaminated with pesticides.

这个化学测试显示土壤被农药污染。

作文

In the field of science, particularly in chemistry, a chemical test is an essential procedure used to identify or quantify the presence of specific substances. These tests are fundamental tools that help chemists and researchers analyze materials, understand their properties, and determine their composition. A chemical test can range from simple procedures that require minimal equipment to complex analyses that involve sophisticated instruments. One common example of a chemical test is the litmus test, which is used to determine whether a solution is acidic or basic. The litmus paper changes color depending on the pH level of the solution being tested. This simple yet effective chemical test has been used for centuries and remains a staple in educational laboratories across the world.Another example is the use of reagents in a chemical test. When a specific reagent is added to a sample, it may react with the substance present, producing a color change or precipitate that indicates the presence of a particular ion or compound. For instance, adding silver nitrate to a solution can help identify chloride ions, as it will produce a white precipitate of silver chloride if they are present. Such chemical tests are invaluable in fields such as environmental science, where detecting pollutants in water or soil samples is crucial for assessing ecological health.Moreover, chemical tests can also be qualitative or quantitative. Qualitative tests provide information about the presence or absence of a substance, while quantitative tests measure the concentration of that substance in a sample. For example, titration is a quantitative chemical test that involves adding a titrant to a solution until a reaction reaches its endpoint, allowing scientists to calculate the concentration of an unknown solution based on the volume of titrant used.The importance of chemical tests extends beyond academic research; they are also critical in various industries, including pharmaceuticals, food safety, and materials science. In pharmaceuticals, chemical tests are conducted to ensure that drugs meet safety standards and contain the correct ingredients. In food safety, tests are performed to detect harmful substances, such as pesticides or pathogens, ensuring that food products are safe for consumption.In conclusion, a chemical test is a vital aspect of chemical analysis that plays a significant role in multiple disciplines. Whether used in a laboratory setting to educate students or in industrial applications to maintain safety and quality, these tests are indispensable tools for understanding the composition and properties of substances. As technology advances, the methods and techniques for conducting chemical tests continue to evolve, leading to more accurate and efficient analyses. Thus, mastering the concept of chemical tests is essential for anyone pursuing a career in science or related fields, as it forms the foundation for understanding chemical interactions and processes.

在科学领域，特别是在化学中，化学测试是一种基本程序，用于识别或量化特定物质的存在。这些测试是帮助化学家和研究人员分析材料、理解其性质以及确定其成分的基本工具。化学测试可以从需要最少设备的简单程序到涉及复杂仪器的复杂分析不等。一个常见的例子是石蕊测试，它用于确定溶液是酸性还是碱性。石蕊纸根据被测试溶液的pH值变化而改变颜色。这种简单而有效的化学测试已经使用了几个世纪，并仍然是世界各地教育实验室的基础。另一个例子是试剂在化学测试中的使用。当将特定试剂添加到样品中时，它可能会与存在的物质反应，产生颜色变化或沉淀，指示特定离子或化合物的存在。例如，向溶液中添加硝酸银可以帮助识别氯离子，因为如果它们存在，将产生白色的氯化银沉淀。这种化学测试在环境科学等领域中是不可或缺的，因为检测水或土壤样品中的污染物对于评估生态健康至关重要。此外，化学测试还可以是定性或定量的。定性测试提供有关物质存在或缺失的信息，而定量测试测量样品中该物质的浓度。例如，滴定是一种定量的化学测试，涉及向溶液中添加滴定剂，直到反应达到终点，从而允许科学家根据使用的滴定剂体积计算未知溶液的浓度。化学测试的重要性超越了学术研究；它们在制药、食品安全和材料科学等多个行业中也至关重要。在制药行业，进行化学测试以确保药物符合安全标准并含有正确的成分。在食品安全方面，进行测试以检测有害物质，如农药或病原体，从而确保食品产品安全可供消费。总之，化学测试是化学分析的重要组成部分，在多个学科中发挥着重要作用。无论是在实验室环境中用于教育学生，还是在工业应用中保持安全和质量，这些测试都是理解物质成分和性质的不可或缺的工具。随着技术的进步，进行化学测试的方法和技术不断发展，导致分析更加准确和高效。因此，掌握化学测试的概念对任何追求科学或相关领域职业的人来说都是至关重要的，因为这构成了理解化学相互作用和过程的基础。