IGCSE AQA Science: Practical Skills Guide | IGCSE AQA 科学：实验操作指南

📚 IGCSE AQA Science: Practical Skills Guide | IGCSE AQA 科学：实验操作指南

Mastering practical skills is essential for success in IGCSE AQA Science. This guide covers the key techniques required to plan, carry out, analyse, and evaluate experiments safely and accurately. Whether you are investigating enzyme activity, determining the density of a material, or measuring the speed of a reaction, strong practical abilities will help you achieve top marks.

掌握实验技能对于在 IGCSE AQA 科学考试中取得成功至关重要。本指南涵盖安全准确地设计、实施、分析和评估实验所需的关键技术。无论你是在研究酶的活性、测定材料的密度还是测量反应速率，扎实的实验能力都将帮助你获得高分。

1. Understanding Variables | 理解变量

Every scientific investigation involves three categories of variables: independent, dependent, and control variables. The independent variable is the factor that you change on purpose. The dependent variable is the factor that you measure or observe as a result. Control variables are all other factors that must be kept the same to ensure that the experiment is a fair test.

每个科学探究都涉及三类变量：自变量、因变量和控制变量。自变量是你有意改变的因素。因变量是你测量或观察到的结果。控制变量是必须保持相同的所有其他因素，以确保实验是一个公平测试。

For example, when investigating

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