化学
按重点领域探索化学——从物质与结构到反应、能量与专题方向，再进入各领域的核心概念。
化学 入门视频
先看一段短视频，再继续浏览下面的领域与指南。
The Nucleus: Crash Course Chemistry #1
CrashCourse
What it is: a strong introduction to atoms and the core foundations of chemistry.
在 YouTube 观看
Introduction to chemistry | Atoms, compounds, and ions | Chemistry | Khan Academy
Khan Academy
Why learn it: explains how chemistry helps us understand matter, science, and problem solving.
在 YouTube 观看
Water & Solutions - for Dirty Laundry: Crash Course Chemistry #7
CrashCourse
Real-life connection: shows chemistry in daily activities like cleaning, mixtures, and solutions.
在 YouTube 观看
Just How Small is an Atom?
TED-Ed
Domain-aligned starter on atomic structure and scale behind matter and reactions.
在 YouTube 观看
What Does A Chemist Do?
Career Igniter
Careers: introduces chemist roles and pathways across labs, healthcare, and industry.
在 YouTube 观看
重点领域与领域
领域划分遵循当前化学分类（与常见课程衔接）。每张卡片列出可直接打开的核心概念。
Matter & Structure
3 个知识域Chemical Reactions
4 个知识域Energy, Solutions & Electrons
3 个知识域Specialized Chemistry
2 个知识域Atomic Structure & Periodicity · 指南
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