📚 Questions, Evidence, and Explanations in Chemistry | 化学中的问题、证据与解释
When you carry out a chemistry investigation, you are really answering a question. You collect evidence from experiments, then use that evidence to build an explanation. This process - asking good questions, gathering evidence, and writing explanations - is at the heart of science.
当你进行化学探究时，你实际上是在回答一个问题。你通过实验收集证据，然后用这些证据来构建解释。这个过程——提出好问题、收集证据和撰写解释——是科学的核心。
1. What Is a Scientific Question? | 什么是科学问题？
A scientific question is one that can be answered by collecting evidence. It is specific, testable, and usually asks about how changing one factor affects another. For example, 'How does the concentration of hydrochloric acid affect the time taken for magnesium ribbon to disappear?' is a good scientific question.
科学问题是可以通过收集证据来回答的问题。它是具体的、可检验的，通常询问改变一个因素如何影响另一个因素。例如，'盐酸的浓度如何影响镁条消失所需的时间？' 就是一个好的科学问题。
In chemistry, avoid questions that are too broad or based on opinion, such as 'Are acids dangerous?' Instead, ask questions that can be investigated with measurements or clear observations, like 'How does the pH of a solution change when a base is added?'
在化学中，要避免过于宽泛或基于观点的问题，例如 '酸危险吗？'。相反，应提出可以通过测量或清晰观察来探究的问题，例如 '加入碱时溶液的pH值如何变化？'。
2. Types of Questions in Chemistry | 化学问题的类型
Chemistry questions often fall into three main groups. Descriptive questions ask what something is or what happens, for example 'What colour does universal indicator turn in vinegar?' Comparative questions ask how two or more substances differ, such as 'Which metal reacts faster with dilute acid: magnesium or zinc?'
化学问题通常分为三大类。描述性问题询问某物是什么或发生了什么，例如 '通用指示剂在醋中变成什么颜色？'。比较性问题询问两种或多种物质有何不同，例如 '哪种金属与稀酸反应更快：镁还是锌？'。
Causal questions ask about cause and effect. They link an independent variable to a dependent variable, for example 'How does temperature affect the rate of reaction between sodium thiosulfate and hydrochloric acid?' At Key Stage 3, you should practise changing a descriptive or comparative question into a causal one that can be tested fairly.
因果问题询问原因和结果。它们将自变量与因变量联系起来，例如 '温度如何影响硫代硫酸钠与盐酸的反应速率？'。在KS3阶段，你应该练习将描述性或比较性问题转变为可以公平检验的因果问题。
3. From Question to Prediction | 从问题到预测
A prediction states what you think will happen and why, based on scientific ideas. It is more than a guess. A useful format is: 'If the independent variable increases, then the dependent variable will change because ...' For example, 'If the temperature of the acid increases, then the reaction will take less time because particles move faster and collide more often.'
预测说明你认为会发生什么以及为什么，基于科学思想。它不仅仅是猜测。一个有用的格式是：'如果自变量增大，那么因变量将会改变，因为……'。例如，'如果酸的温度升高，那么反应所需的时间将会缩短，因为粒子运动更快，碰撞更频繁。'
Your prediction should always link back to the original question and be specific enough to test. In chemistry, use the particle model, reactivity series, or ideas about acids and bases to explain your reasoning.
你的预测应该始终与原始问题相关联，并且足够具体以便检验。在化学中，可以使用粒子模型、金属活动性顺序或酸碱概念来解释你的推理。
4. Planning a Fair Test | 设计公平实验
A fair test changes only one variable at a time. The variable you deliberately change is the independent variable. The variable you measure or observe is the dependent variable. All other variables that could affect the results must be controlled.
公平实验每次只改变一个变量。你故意改变的变量是自变量。你测量或观察的变量是因变量。所有其他可能影响结果的变量都必须加以控制。
For example, if you investigate how acid concentration affects the reaction with magnesium, you must keep the mass of magnesium, the volume of acid, the temperature, and the surface area of the metal the same. Only the acid concentration changes.
例如，如果你探究酸的浓度如何影响与镁的反应，你必须保持镁的质量、酸的体积、温度以及金属的表面积相同。只有酸的浓度改变。
You should also decide how many repeat measurements to take. Repeating the experiment three times and calculating a mean makes your evidence more reliable.
你还应该决定进行多少次重复测量。将实验重复三次并计算平均值会使你的证据更加可靠。
5. Collecting Evidence: Observations
Published by TutorHao | KS3 Chemistry Revision Series | aleveler.com
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