CHAPTER 01 / BEFORE CLASS / PREPARATION 01
Particles explain the states
See how the same particles behave in a solid, a liquid and a gas.
10–15 minutes · A guided first stepPrepare when your teacher assigns this topic; this is one core task, not the whole chapter. Answers save on this device. Download your record to share it with your teacher.
按老师指定的知识点完成，不必按章节统一赶进度。中文提示随时可用，不影响完成。当前进度保存在本机，可下载记录。
STEP 1 / 6
Get ready
You do not need to know these words yet. We will introduce them before asking you to use them.
如果还没学过，跟着模型和例题走即可。学过的同学可以先练习，不确定时回来看看。
By the end, you will be able to:
- Describe the arrangement and movement of particles.
- Explain why a liquid flows but a solid keeps its shape.
- Explain a change of state without changing the particles.
This is preparation. You are allowed to be unsure; you do not need every answer right.
My work · 登录查看班级作业 ↗
For class tracking, open the assigned task from My work. / 需从“我的作业”打开老师布置的任务，再提交到班级。
Weekend preparation → weekday recall
These short cards help you recall the model and words before class. They are not another copy of this activity.
Download 3 recall cards · PDF ↓Browse all preparation tasks ↗